You can add many events to the same element: You can add different events to the same element: To pass parameter values, use an "anonymous function": Change the background color of a element: The difference between bubbling and capturing: element.addEventListener() is a DOM Level 2 (2001) feature. So If I remove the windows load event and just have the Document add event listener event it should work? You can check whether any option is supported this way. How to provision multi-tier a file system across fast and slow storage while combining capacity? See Safely detecting option support for details. The JavaScript addEventListener () method allows you to set up functions to be called when a specified event happens, such as when a user clicks a button. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Why is a "TeX point" slightly larger than an "American point"? But if your event fires rapidly (like the resize event) or you want to look at a succession of events, logging will likely be more useful. For more beginner-friendly web development knowledge, visit my blog at 1000 Mile World and follow me on Twitter. Enjoys a good board game and a coconut cake. Enable JavaScript to view data. fullscreenerror might look like this: In older versions of the DOM specification, the third parameter of Why is the addEventListener not triggering the method on click? Uncaught ReferenceError: toggleDisplay is not defined. Why hasn't the Attorney General investigated Justice Thomas? I did mean to make it a function call!! one handler function created. A case-sensitive string representing the event type to listen for. How to troubleshoot crashes detected by Google Play Store for Flutter app, Cupertino DateTime picker interfering with scroll behaviour. generate a console warning. You also may not know when an event will happen, especially if it is user generated. Syntax Use the event name in methods like addEventListener (), or set an event handler property. An earlier listener may be stopping its propagation altogether. I have tried it in IE11 and Firefox26.0. (Took an in depth look just now, and copy pasted what i posted above). See The event listener callback for details on the callback itself. false as the value of the useCapture parameter. Sorting With JS/jQuery Show() + Hide() if id has specific class? You can set more than one of the options in the options parameter. To prevent that problem, browsers other than Safari have changed the default value of the passive option to true for the wheel, mousewheel, touchstart and touchmove events on the document-level nodes Window, Document, and Document.body. the click is bound to a button that gets replaced by the update panel. the event argument that is passed to the handler. They play an important role as they can cause elements of a web page to change dynamically. This website uses cookies to improve your experience while you navigate through the website. The difference now is there is no event listener for a click event. Over time, it became clear that more options were needed. The available Notice that the listener is an anonymous function that encapsulates code that is then, In the first case above, a new (anonymous) handler function is created with each Well no, i have not changed anything in the html what so ever. background.html vs. background.js - chrome extension. When I added the function directly to the windows event (did not bind it to any element) it worked correctly. This example demonstrates how to add an addEventListener() that can be aborted with an AbortSignal. such as when using a generic handler for a set of similar elements. You should use the window load event OR the DOMContentLoaded event, but not both. The event listener can be specified as either a callback function or Which equals operator (== vs ===) should be used in JavaScript comparisons? 1. Event listener not working? In my indexdb.js: Why is nothing happening when I click the button w/ id="newitem" ? There were further problems in my class functions regarding the database. : document.addEventListener('DOMContentLoaded', function() { document.getElementById("clickToPlay").addEventListener("click", function() { winPrize; }, false); }); @NiraliPatel - yes, that should work as I've added to the end of my answer. Instead of two DOMContentLoaded listeners, try one. Just add a getter for that What does "use strict" do in JavaScript, and what is the reasoning behind it? The event listener callback for details on the callback itself. assigned ("store") the same object reference. notation. aren't called.). If an event handler (for example, onclick) is specified on an element in the HTML source, the JavaScript code in the This tutorial shows you how you can implement addEventListener () in your code. I noticed that when passing a method through props, this.functionName works while this.functionName() gives funky errors. That results in the value remaining as "three" forever because we no longer have any code listening for a click event. I am trying to use windows.addEventListener to execute my function on clicking a div. The addEventListener () method of the EventTarget interface sets up a function that will be called whenever the specified event is delivered to the target. event listener, and any changes to the data back out after an event handler executes. Why? Because of that, when you want to override that behavior and ensure the passive option is false in all browsers, you must explicitly set the option to false (rather than relying on the default). Note that the value of this inside a function, called by the code So tabbing onto the button and using space or enter key does nothing. Put someone on the same pedestal as another, Use Raster Layer as a Mask over a polygon in QGIS. Why does my JavaScript code receive a "No 'Access-Control-Allow-Origin' header is present on the requested resource" error, while Postman does not? Program runs: It reaches that addEventListener function call. Using the nextTick and eventSandbox API to wait one tick until all events are processed, and validate if anything was prevented (see screenshot). Understanding Events and Event Handlers Events are actions that happen when the user or browser manipulates a page. Inherits from Event. Get certifiedby completinga course today! If not specified, no AbortSignal is associated with the listener. options object with passive set to Content Discovery initiative 4/13 update: Related questions using a Machine error while changing element in DOM using vannilla JS, Javascript code runs at launch once (addEventListener not working). upward through the tree will not trigger a listener designated to use capture. Trigger a button click with JavaScript on the Enter key in a text box. Because by the time the event listener would execute, the scope in which function. The first thing to check is the syntax of your code. memory location of the actual data is stored in the variable. Remove the parenthesis: When you put addTodo() as a parameter, you are not passing the function itself. shown in the following example: The value of this within logID() is a reference to the global addEventListener(type, listener) listener: The object that receives a notification (an object that implements the Event interface) when an event of the specified type occurs. Thanks for contributing an answer to Stack Overflow! If youre using Firefox, you may be able to skip using logs or breakpoints for running that check. If your browser is up-to-date, you will get the following dialog box. It pays to have a good understanding of that system when dealing with events. These cookies will be stored in your browser only with your consent. I think it's not working because the browser processed the javascript file before the HTML and at that . a reference to the listener around so you can remove it later. I guess there is no IDE or type of practice that can save you from that. See DOM Level 3 Events and JavaScript Event order for a detailed explanation. Content available under a Creative Commons license. In this code, modifyText() is a listener for click events This is an example with and without bind(): Another solution is using a special function called handleEvent() to catch If a passive listener third parameter. means that if the browser checks the value of the passive property on the Click the outer, middle, inner containers respectively to see how the options work. Finding the exact listener youre after in the often long list of listeners (thanks, event delegation) can be a good quick first step before adding extra logs. options, so that the options will be checked if the browser recognizes an object as the The Function.prototype.bind() method lets you establish a fixed registered using addEventListener(). Function.prototype.bind() to pass a value to an event listener via the for information on variable scope). occurrence of this within the code represents a reference to the element. What does Canada immigration officer mean by "I'm not satisfied that you will leave Canada based on your purpose of visit"? Sometimes though, you have a piece of code meant to respond to one of those events and nothing happens. When two variables reference the same The addEventListener() method attaches an event handler to a document. To run the above program, save the file name "anyName.html (index.html)" and right click on the file. Get certifiedby completinga course today! Not the answer you're looking for? object based on Event describing the event that has occurred, and it At this point we only have code tied to the button that only responds to the pointer event. but the target may be any object that supports events (such as XMLHttpRequest). (NOT interested in AI answers, please). An ideal place would be inline first thing inside the tag. Uncaught TypeError: Cannot call method 'addEventListener' of null such as during the bubbling phase. the same unchanging source-code called repeatedly, even if in a loop. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. let variables from outer scopes, you cannot expect any changes to these Select the option "Open with Live Server" in VS Code editor. What is the !! Try moving the script to the bottom of the body: Move this to the end of the document, or wrap it with an onload function: Your code doesn't work because the DOM is not ready yet and you are already trying to fetch id1 and id2. in Note: If a particular anonymous function is in the list of event listeners registered for a certain target, and then later in the code, an identical anonymous function is given in an addEventListener call, the second function will also be added to the list of event listeners for that target. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: document.addEventListener("click", myFunction); document.addEventListener("click", function(){. Ive always wondered why the parentheses are sometimes needed; and sometimes just break everything. The earlier its execution, the better to ensure no other piece of code gets in its way of capturing the event. Donations to freeCodeCamp go toward our education initiatives, and help pay for servers, services, and staff. Note: For event listeners attached to the event target, the event is in the target phase, rather than the capturing and bubbling phases. Our mission: to help people learn to code for free. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. If your event listener not working is dependent on some logic, whether its about which element itll listen on or if its registered at all, the first step is to check that the listener is indeed added to the element. Making statements based on opinion; back them up with references or personal experience. . If not specified, defaults to false except that in browsers other than Safari, defaults to true for the wheel, mousewheel, touchstart and touchmove events. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Do you get any errors in console, can you log a message at the top of, @TbWill4321 My apologies. However nothing is happening. In these scenarios, you need an event handler to detect when an event happens. 0 'dbclick' event listener not working but 'click' is. Is there a free software for modeling and graphical visualization crystals with defects? "inner2, none-passive, default, not open new page", // the text that the button is initialized with, // the text that the button contains after being clicked, // we hoist the event listener callback function, // to prevent having duplicate listeners attached. You don't have to do anything special and JavaScript automatically knows what to do when you pass in a parameter this way to your function. document.addEventListener("click", myFunction1); document.addEventListener("mouseover", myFunction); document.addEventListener("click", function() {, W3Schools is optimized for learning and training. Remove the parenthesis: .addEventListener ("click", addTodo, false); When you put addTodo () as a parameter, you are not passing the function itself. Preference cookies are used to store user preferences to provide content that is customized and convenient for the users, like the language of the website or the location of the visitor. means variables that "store" objects can actually affect other variables that get Setting the passive option to true as shown in the following example enables performance optimizations that can dramatically improve the performance of an application. Examples might be simplified to improve reading and learning. Thats whats happening now, put it on top, Evaluate that. the element. myElement.removeEventListener("click", processEvent, false) Not the answer you're looking for? Especially When Working in Teams | by Shun Yao | Medium 500 Apologies, but something went wrong on our end. This handler can be attached to a specific HTML element you wish to monitor events for, and the element can have more than one handler attached. can have properties, and will be retained in memory even after they finish executing Let's explore this. bubbling and capturing are two ways of propagating events that occur in an element Code can then add listeners to run custom logic in response. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. This example demonstrates how to use addEventListener() to watch for mouse How to provision multi-tier a file system across fast and slow storage while combining capacity? that not all browsers have supported historically. iteration of the loop. What does "use strict" do in JavaScript, and what is the reasoning behind it? How can I convert object HTMLButtonElement to html button? We will build your web or mobile app, help you launch faster and scale better. Please note that while anonymous and arrow functions are similar, they have different If you read this far, tweet to the author to show them you care. document. Note: The addEventListener() method is the recommended way to register an event listener. For example, if you want to check for the passive option: This creates an options object with a getter function for the Did you mean to call a function like. Then, we call removeEventListener() to clean up after set to true; otherwise, it will remain false. How do two equations multiply left by left equals right by right? Do EU or UK consumers enjoy consumer rights protections from traders that serve them from abroad? In the following example we are setting two options: It is often desirable to reference the element on which the event handler was fired, capture. The first thing it does is execute the function and use the return value as the parameter instead. How to remove a JS Event Listener buttonEl.removeEventListener('click', => alert("Hi user!")); Just like that! If this does not solve your issue it's potentially a duplicate of Onclick is not working on CSS3DObject. See true; otherwise, we know that we need to pass a Boolean, and we pass Analytical cookies are used to understand how visitors interact with the website. Note: Objects are stored in variables by reference, meaning only the sets up a function that will be called whenever the specified event is delivered to the target. object Window (or undefined in the case of strict mode. My apologies. Common targets are Element, or its children, Document, and Window , but the target may be any object that supports events (such as XMLHttpRequest ). Undefined cookies are those that are being analyzed and have not been classified into a category as yet. intelligently. JavaScript provides an event handler in the form of the addEventListener() method. You can do this by using feature detection for each of the options you're Making statements based on opinion; back them up with references or personal experience. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, The philosopher who believes in Web Assembly, Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. The function offers you 3 options to narrow down which events youre monitoring: This is by no means an exhaustive list of everything that can result in event listeners not working, or not being handled as you would expect. scope. This is important to realise, cos its how the JS engine works. passiveSupported, to true if it gets called. This example demonstrates a simple event listener implemented using arrow function In the second case, the same previously declared function is used that is nested within another element, when both elements have registered a handle for We accomplish this by creating thousands of videos, articles, and interactive coding lessons - all freely available to the public. var quotebtn = document.querySelector("#quoteBtn"); quotebtn.addEventListener("click", function { document.querySelector("#getaquote").css({ "opacity": "0" }); }); With the html syntax: Get a quote For some reason it isn't working. Can members of the media be held legally responsible for leaking documents they never agreed to keep secret? Launch your Firefox browser and click on the three horizontal ellipses in the top right corner. Connect and share knowledge within a single location that is structured and easy to search. if assigned to a variable that persists in memory.). - Vinnei. documentElement.addEventListener("click", function(e) { console.log( e. target); }); This is where it gets tricky. What is the etymology of the term space-time? Since it can't be canceled, event listeners can't block page rendering anyway. The subtle difference between referring a function and calling it only became apparent to me when I first worked on React. addEventListener("DOMContentLoaded", (event) => {}); onDOMContentLoaded = (event) => {}; Event type A generic Event. that event. question, you can do something like this: Here we're adding a listener for the mouseup A boolean value indicating that the listener Asking for help, clarification, or responding to other answers. I can remember being really confused as to why that didnt work when I was first starting out, why I couldnt do that. Itll also let you look at the call stack to see what triggered the event in case its fired by code. Common targets are Element, or its children, Document, and Window, this binding of the containing function. yesterday. There is a cheap solution (inspired from src\client\page-navigation-watch.ts) in file src\client\sandbox\child-window\index.ts. Why does awk -F work for most letters, but not for the letter "t"? does call preventDefault(), the user agent will do nothing other than Unlike most functions in JavaScript, objects are retained in memory as long as a either variable will affect the other. element.addEventListener("click", myFunction1); element.addEventListener("mouseover", myFunction); element1.addEventListener("click", myFunction, false); Thank you for your help, the parenthesis was a problem as well. However, when I click the start button, it didn't work. But opting out of some of these cookies may have an effect on your browsing experience. How to determine chain length on a Brompton? preventDefault(). The benefits are as follows: The method addEventListener() works by adding a function, or an object that implements this bindings. The event is firing, but still, nothing happens? 0 js add event listener not working. @DanCouper Wow thanks for the call stack breakdown! the Event Object, Add a comment 3 Answers Sorted by: 13 When attaching the function, you are executing it first, and attaching the return value undefined to the event. referencing the object exists in memory, you can actually use them to get data into an If the function or object is already in the list of event listeners for this target, the function or object is not added a second time. Microsoft Edge: onclick event stops working? addEventListener(), attempting to use it prevents the use of the freeCodeCamp's open source curriculum has helped more than 40,000 people get jobs as developers. Making statements based on opinion; back them up with references or personal experience. This method is suitable when you don't need to know which HTML element the event If an event listener is added to an EventTarget from inside another listener You can learn more from the article about Document 'load' event callbacks not called; how did I mess this up? Talented calligrapher and runner. Why is Noether's theorem not guaranteed by calculus? Among other things, this Breaking will be useful for punctual events like clicks. These cookies track visitors across websites and collect information to provide customized ads. would if you were to actually pass it through its argument list. How do two equations multiply left by left equals right by right? one for breaking the execution and looking at the debugger, one logging a few more information: the event type, its target, the event itself and a stacktrace to see what triggered it. Event Visit Mozilla Corporations not-for-profit parent, the Mozilla Foundation.Portions of this content are 19982023 by individual mozilla.org contributors. optional values), the third parameter was changed to an object that can contain various this code should be tied the update panel load event. the fields that need to be accessed: It may seem that event listeners are like islands, and that it is extremely difficult A Firefox (Gecko)-specific parameter. properties defining the values of options to configure the process of removing the event The addEventListener() method of the EventTarget interface Load 5 more related questions Show fewer related questions Sorted by . Can members of the media be held legally responsible for leaking documents they never agreed to keep secret? How to check whether a string contains a substring in JavaScript? How can I remove a specific item from an array in JavaScript? from outside of an event listener is to make it accessible to the scope in which the Are table-valued functions deterministic with regard to insertion order? Add a click event to the document: document.addEventListener("click", myFunction); function myFunction () { document.getElementById("demo").innerHTML = "Hello World"; } Try it Yourself Simpler syntax: document.addEventListener("click", function() { document.getElementById("demo").innerHTML = "Hello World"; }); Try it Yourself I have the error: Do that, pop it off, This is the first time this has happened to me (posting a code with a typo) . A second thing to look for is that the event is actually dispatched. Is it considered impolite to mention seeing a new city as an incentive for conference attendance? Powered by Discourse, best viewed with JavaScript enabled. You are have to pass the function and not call them immediately: Change document.getElementById("start").addEventListener("click", counter()); to document.getElementById("start").addEventListener("click", counter); Change setInterval(time(), 10); to setInterval(time, 10); Thanks for contributing an answer to Stack Overflow! You should always remove an event listener when you're done using it. If not specified, useCapture defaults to false. candidates for sharing data among scopes. an object whose handleEvent() method serves as the callback function. In older browsers that don't support the options parameter to If a user clicks a button on a page, then a click event has happened. Some will go through them twice, once going from parent to child (during whats called the capture phase) and then once going the other way around (the bubbling phase). at the line: Note: See the compatibility table below if you need to know which 'Re looking for addTodo ( ) to clean up after set to true ; otherwise, it became clear more. A single location that is passed to the handler trying to use windows.addEventListener to execute my function on clicking div... Click event HTML button event order for a set of similar elements `` 'm... Visit Mozilla Corporations not-for-profit parent, the Mozilla Foundation.Portions of this content are 19982023 by individual mozilla.org contributors and happens! A parameter, you have a piece of code meant to respond to one of those events event... In a text box Canada immigration officer mean by `` I 'm satisfied. Potentially a duplicate of Onclick is not working because the browser processed the JavaScript file before the and! Will get the following dialog box: it reaches that addEventListener function call! running that.... Memory location of the containing function between referring a function, or set an event via. When using a generic handler for a set of similar elements JavaScript event order a! Servers, services, and copy pasted what I posted above ) passing a method through,. Answers, please ) not call method 'addEventListener ' of null such as during the bubbling phase than of... Crashes detected by Google Play Store for Flutter app, help you launch faster and scale.! The button w/ id= '' newitem '' wondered why the parentheses are sometimes needed ; sometimes... Play Store for Flutter app, Cupertino DateTime picker interfering with scroll behaviour on React button with... They never agreed to keep secret HTMLButtonElement to HTML button JavaScript, and will be stored in form. A piece of code meant to respond to one of those events and nothing.. Done using it the < head > tag with scroll behaviour Level 3 events and happens. Listeners ca n't be canceled, event listeners ca n't block page rendering anyway to ensure other... And calling it only became apparent to me when I click the start button, it will remain false copy! Elements of a web page to change dynamically I posted above ) opting out of some of these may. Is the recommended way to register an event will happen, especially if it is user.... Understanding of that system when dealing with events my indexdb.js: why is nothing when... In addeventlistener click not working look just now, put it on top, Evaluate that difference now is a... Of similar elements callback itself of this within the code represents a reference to the element via the information! Help people learn to code for free addeventlistener click not working avoid errors, but still, nothing happens being really confused to... Javascript file before the HTML and at that the DOMContentLoaded event, but we can call! Remove a specific item from an array in JavaScript, and will stored! Of your code set an event handler property did mean to make it a function call Play. A web page to change dynamically addeventlistener click not working by left equals right by right still! Below if you need an event handler to detect when an event handler in the value as. And help pay for servers, services, and what is the reasoning it... Know when an event handler executes < head > tag because we no longer any! Mobile app, help you launch faster and scale better cookie policy potentially! The letter addeventlistener click not working t '' are actions that happen when the user or browser manipulates a page then we... Addeventlistener function call back them up with references or personal experience ) to clean up after addeventlistener click not working true. Program runs: it reaches that addEventListener function call passing the function itself button... Actual data is stored in the case of strict mode that can save you from that the... Windows event ( did not bind it to any element ) it correctly... The Answer you 're looking for be canceled, event listeners ca n't be canceled, event listeners n't! Are actions that happen when the user or browser manipulates a page blog at 1000 Mile World and follow on! Web development knowledge, visit my blog at 1000 Mile World and follow me on Twitter Firefox... ( did not bind it to any element ) it worked correctly conference?. Click event an important role as they can cause elements of a web page to change.! And staff ca n't block page rendering anyway id= '' newitem '' > tag click '', processEvent false! '' forever because we no longer have any code listening for a set of similar.! The DOMContentLoaded event, but not for the letter `` t '' can save you from that the w/. Pasted what I posted above ) someone on the callback function personal experience rights protections from that... However, when I click the button w/ id= '' newitem '' name in methods like addEventListener ). And click on the Enter key in a loop the click is bound to a variable that persists memory! And what is the syntax of your code so you can remove it later you agree to our of! Cookies are those that are being analyzed and have not been classified into a category as yet top right.! Equals right by right Window, this binding of the addEventListener ( that! Argument list pedestal as another, use Raster Layer as a Mask a! Also Let you look at the call stack breakdown over time, it did n't.... At that click with JavaScript enabled its how the JS engine works get the following dialog box code in. Will remain false but still, nothing happens of capturing the event that... A Mask over a polygon in QGIS it ca n't be canceled, event addeventlistener click not working. Reasoning behind it personal experience it did n't work my function on clicking a div cookies track visitors websites... Three horizontal ellipses in the top right corner detailed explanation any element ) it worked correctly method addEventListener ). That results in the top right corner Foundation.Portions of this within the code represents a reference to the load! Handler in the value remaining as `` three '' forever because we longer... Let 's explore this methods like addEventListener ( ) method as follows: the (... Using Firefox, you agree to our terms of service, privacy policy and cookie policy IDE! Second thing to look for is that the event listener paste this URL into your RSS reader using Firefox you. Store for Flutter app, help you launch faster and scale better update panel you need to know pass! Common targets are element, or set an event happens mozilla.org contributors,,... The top right corner method 'addEventListener ' of null such as XMLHttpRequest ) substring. Is bound to a Document your browsing experience ive always wondered why the parentheses are sometimes ;! Impolite to mention seeing a new city as an incentive for conference attendance click with JavaScript the... Important role as they can cause elements of a web page to change dynamically from array. Are not passing the function itself logs or breakpoints for running that check have any code listening for click. When passing a method through props, this.functionName works while this.functionName ( ) method as. In my indexdb.js: why is a `` TeX point '' w/ id= '' newitem?. N'T be canceled, event listeners ca n't block page rendering anyway apparent to me when I the... Are being analyzed and have not been classified into a category as yet execute the function itself from! Whose handleEvent ( ) gives funky errors object HTMLButtonElement to HTML button equals right right. Enjoy consumer rights protections from traders that serve them from abroad errors, but we can not warrant full of... To a variable that persists in memory even after they finish executing 's! Item from an array in JavaScript, and will be stored in your browser only with your.! Windows.Addeventlistener to execute my function on clicking a div 1000 Mile World follow... Look at the line: note: see the compatibility table below if you need to know Yao | 500! With scroll behaviour starting out, why I couldnt do that two variables reference same! To code for free for details on the callback itself `` TeX point '' stored! Worked correctly running that check key in a text box the JS engine works to check whether a string addeventlistener click not working... Through the tree will not trigger a button click with JavaScript on the callback itself it does is execute function. To improve reading and learning add an addEventListener ( ), or an whose! Are being analyzed and have not been classified into a category as yet be aborted an! And collect information to provide customized ads were to actually pass it through its argument.. ) it worked correctly is there is no IDE or type of practice that be. Google Play Store for Flutter app, Cupertino DateTime picker interfering with scroll behaviour it pays to have piece. Data is stored in the form of the media be held legally responsible for leaking documents they never agreed keep. Callback for details on the callback itself a piece of code meant to respond to one the! An important role as they can cause elements of a web page to change dynamically to see triggered! In my class functions regarding the database of Onclick is not working because the browser processed the file! Letter `` t '' its fired by code cause elements of a web to. To why that didnt work when I added the function itself strict '' do in JavaScript `` I 'm satisfied... In Teams | by Shun Yao | Medium 500 Apologies, but not both,! Noether 's theorem not guaranteed by calculus how to provision multi-tier a file system across fast and slow storage combining. And nothing happens making statements based on opinion ; back them up with references or personal....