When I played with <input type="range">
, Firefox triggers an onchange event only if we drop the slider to a new position where Chrome and others triggers onchange events while the slider is dragged.
How can I make it happen on dragging in Firefox?
function showVal(newVal){_x000D_
document.getElementById("valBox").innerHTML=newVal;_x000D_
}
_x000D_
<span id="valBox"></span>_x000D_
<input type="range" min="5" max="10" step="1" onchange="showVal(this.value)">
_x000D_
This question is related to
javascript
html
firefox
input
onchange
UPDATE: I am leaving this answer here as an example of how to use mouse events to use range/slider interactions in desktop (but not mobile) browsers. However, I have now also written a completely different and, I believe, better answer elsewhere on this page that uses a different approach to providing a cross-browser desktop-and-mobile solution to this problem.
Original answer:
Summary: A cross-browser, plain JavaScript (i.e. no-jQuery) solution to allow reading range input values without using on('input'...
and/or on('change'...
which work inconsistently between browsers.
As of today (late Feb, 2016), there is still browser inconsistency so I'm providing a new work-around here.
The problem: When using a range input, i.e. a slider, on('input'...
provides continuously updated range values in Mac and Windows Firefox, Chrome and Opera as well as Mac Safari, while on('change'...
only reports the range value upon mouse-up. In contrast, in Internet Explorer (v11), on('input'...
does not work at all, and on('change'...
is continuously updated.
I report here 2 strategies to get identical continuous range value reporting in all browsers using vanilla JavaScript (i.e. no jQuery) by using the mousedown, mousemove and (possibly) mouseup events.
Strategy 1: Shorter but less efficient
If you prefer shorter code over more efficient code, you can use this 1st solution which uses mousesdown and mousemove but not mouseup. This reads the slider as needed, but continues firing unnecessarily during any mouse-over events, even when the user has not clicked and is thus not dragging the slider. It essentially reads the range value both after 'mousedown' and during 'mousemove' events, slightly delaying each using requestAnimationFrame
.
var rng = document.querySelector("input");_x000D_
_x000D_
read("mousedown");_x000D_
read("mousemove");_x000D_
read("keydown"); // include this to also allow keyboard control_x000D_
_x000D_
function read(evtType) {_x000D_
rng.addEventListener(evtType, function() {_x000D_
window.requestAnimationFrame(function () {_x000D_
document.querySelector("div").innerHTML = rng.value;_x000D_
rng.setAttribute("aria-valuenow", rng.value); // include for accessibility_x000D_
});_x000D_
});_x000D_
}
_x000D_
<div>50</div><input type="range"/>
_x000D_
Strategy 2: Longer but more efficient
If you need more efficient code and can tolerate longer code length, then you can use the following solution which uses mousedown, mousemove and mouseup. This also reads the slider as needed, but appropriately stops reading it as soon as the mouse button is released. The essential difference is that is only starts listening for 'mousemove' after 'mousedown', and it stops listening for 'mousemove' after 'mouseup'.
var rng = document.querySelector("input");_x000D_
_x000D_
var listener = function() {_x000D_
window.requestAnimationFrame(function() {_x000D_
document.querySelector("div").innerHTML = rng.value;_x000D_
});_x000D_
};_x000D_
_x000D_
rng.addEventListener("mousedown", function() {_x000D_
listener();_x000D_
rng.addEventListener("mousemove", listener);_x000D_
});_x000D_
rng.addEventListener("mouseup", function() {_x000D_
rng.removeEventListener("mousemove", listener);_x000D_
});_x000D_
_x000D_
// include the following line to maintain accessibility_x000D_
// by allowing the listener to also be fired for_x000D_
// appropriate keyboard events_x000D_
rng.addEventListener("keydown", listener);
_x000D_
<div>50</div><input type="range"/>
_x000D_
Demo: Fuller explanation of the need for, and implementation of, the above work-arounds
The following code more fully demonstrates numerous aspects of this strategy. Explanations are embedded in the demonstration:
var select, inp, listen, unlisten, anim, show, onInp, onChg, onDn1, onDn2, onMv1, onMv2, onUp, onMvCombo1, onDnCombo1, onUpCombo2, onMvCombo2, onDnCombo2;_x000D_
_x000D_
select = function(selctr) { return document.querySelector(selctr); };_x000D_
inp = select("input");_x000D_
listen = function(evtTyp, cb) { return inp. addEventListener(evtTyp, cb); };_x000D_
unlisten = function(evtTyp, cb) { return inp.removeEventListener(evtTyp, cb); };_x000D_
anim = function(cb) { return window.requestAnimationFrame(cb); };_x000D_
show = function(id) {_x000D_
return function() {_x000D_
select("#" + id + " td~td~td" ).innerHTML = inp.value;_x000D_
select("#" + id + " td~td~td~td").innerHTML = (Math.random() * 1e20).toString(36); // random text_x000D_
};_x000D_
};_x000D_
_x000D_
onInp = show("inp" ) ;_x000D_
onChg = show("chg" ) ;_x000D_
onDn1 = show("mdn1") ;_x000D_
onDn2 = function() {anim(show("mdn2")); };_x000D_
onMv1 = show("mmv1") ;_x000D_
onMv2 = function() {anim(show("mmv2")); };_x000D_
onUp = show("mup" ) ;_x000D_
onMvCombo1 = function() {anim(show("cmb1")); };_x000D_
onDnCombo1 = function() {anim(show("cmb1")); listen("mousemove", onMvCombo1);};_x000D_
onUpCombo2 = function() { unlisten("mousemove", onMvCombo2);};_x000D_
onMvCombo2 = function() {anim(show("cmb2")); };_x000D_
onDnCombo2 = function() {anim(show("cmb2")); listen("mousemove", onMvCombo2);};_x000D_
_x000D_
listen("input" , onInp );_x000D_
listen("change" , onChg );_x000D_
listen("mousedown", onDn1 );_x000D_
listen("mousedown", onDn2 );_x000D_
listen("mousemove", onMv1 );_x000D_
listen("mousemove", onMv2 );_x000D_
listen("mouseup" , onUp );_x000D_
listen("mousedown", onDnCombo1);_x000D_
listen("mousedown", onDnCombo2);_x000D_
listen("mouseup" , onUpCombo2);
_x000D_
table {border-collapse: collapse; font: 10pt Courier;}_x000D_
th, td {border: solid black 1px; padding: 0 0.5em;}_x000D_
input {margin: 2em;}_x000D_
li {padding-bottom: 1em;}
_x000D_
<p>Click on 'Full page' to see the demonstration properly.</p>_x000D_
<table>_x000D_
<tr><th></th><th>event</th><th>range value</th><th>random update indicator</th></tr>_x000D_
<tr id="inp" ><td>A</td><td>input </td><td>100</td><td>-</td></tr>_x000D_
<tr id="chg" ><td>B</td><td>change </td><td>100</td><td>-</td></tr>_x000D_
<tr id="mdn1"><td>C</td><td>mousedown </td><td>100</td><td>-</td></tr>_x000D_
<tr id="mdn2"><td>D</td><td>mousedown using requestAnimationFrame</td><td>100</td><td>-</td></tr>_x000D_
<tr id="mmv1"><td>E</td><td>mousemove </td><td>100</td><td>-</td></tr>_x000D_
<tr id="mmv2"><td>F</td><td>mousemove using requestAnimationFrame</td><td>100</td><td>-</td></tr>_x000D_
<tr id="mup" ><td>G</td><td>mouseup </td><td>100</td><td>-</td></tr>_x000D_
<tr id="cmb1"><td>H</td><td>mousedown/move combo </td><td>100</td><td>-</td></tr>_x000D_
<tr id="cmb2"><td>I</td><td>mousedown/move/up combo </td><td>100</td><td>-</td></tr>_x000D_
</table>_x000D_
<input type="range" min="100" max="999" value="100"/>_x000D_
<ol>_x000D_
<li>The 'range value' column shows the value of the 'value' attribute of the range-type input, i.e. the slider. The 'random update indicator' column shows random text as an indicator of whether events are being actively fired and handled.</li>_x000D_
<li>To see browser differences between input and change event implementations, use the slider in different browsers and compare A and B.</li>_x000D_
<li>To see the importance of 'requestAnimationFrame' on 'mousedown', click a new location on the slider and compare C (incorrect) and D (correct).</li>_x000D_
<li>To see the importance of 'requestAnimationFrame' on 'mousemove', click and drag but do not release the slider, and compare E (often 1 pixel behind) and F (correct).</li>_x000D_
<li>To see why an initial mousedown is required (i.e. to see why mousemove alone is insufficient), click and hold but do not drag the slider and compare E (incorrect), F (incorrect) and H (correct).</li>_x000D_
<li>To see how the mouse event combinations can provide a work-around for continuous update of a range-type input, use the slider in any manner and note whichever of A or B continuously updates the range value in your current browser. Then, while still using the slider, note that H and I provide the same continuously updated range value readings as A or B.</li>_x000D_
<li>To see how the mouseup event reduces unnecessary calculations in the work-around, use the slider in any manner and compare H and I. They both provide correct range value readings. However, then ensure the mouse is released (i.e. not clicked) and move it over the slider without clicking and notice the ongoing updates in the third table column for H but not I.</li>_x000D_
</ol>
_x000D_
SUMMARY:
I provide here a no-jQuery cross-browser desktop-and-mobile ability to consistently respond to range/slider interactions, something not possible in current browsers. It essentially forces all browsers to emulate IE11's on("change"...
event for either their on("change"...
or on("input"...
events. The new function is...
function onRangeChange(r,f) {
var n,c,m;
r.addEventListener("input",function(e){n=1;c=e.target.value;if(c!=m)f(e);m=c;});
r.addEventListener("change",function(e){if(!n)f(e);});
}
...where r
is your range input element and f
is your listener. The listener will be called after any interaction that changes the range/slider value but not after interactions that do not change that value, including initial mouse or touch interactions at the current slider position or upon moving off either end of the slider.
Problem:
As of early June 2016, different browsers differ in terms of how they respond to range/slider usage. Five scenarios are relevant:
The following table shows how at least three different desktop browsers differ in their behaviour with respect to which of the above scenarios they respond to:
Solution:
The onRangeChange
function provides a consistent and predictable cross-browser response to range/slider interactions. It forces all browsers to behave according to the following table:
In IE11, the code essentially allows everything to operate as per the status quo, i.e. it allows the "change"
event to function in its standard way and the "input"
event is irrelevant as it never fires anyway. In other browsers, the "change"
event is effectively silenced (to prevent extra and sometimes not-readily-apparent events from firing). In addition, the "input"
event fires its listener only when the range/slider's value changes. For some browsers (e.g. Firefox) this occurs because the listener is effectively silenced in scenarios 1, 4 and 5 from the above list.
(If you truly require a listener to be activated in either scenario 1, 4 and/or 5 you could try incorporating "mousedown"
/"touchstart"
, "mousemove"
/"touchmove"
and/or "mouseup"
/"touchend"
events. Such a solution is beyond the scope of this answer.)
Functionality in Mobile Browsers:
I have tested this code in desktop browsers but not in any mobile browsers. However, in another answer on this page MBourne has shown that my solution here "...appears to work in every browser I could find (Win desktop: IE, Chrome, Opera, FF; Android Chrome, Opera and FF, iOS Safari)". (Thanks MBourne.)
Usage:
To use this solution, include the onRangeChange
function from the summary above (simplified/minified) or the demo code snippet below (functionally identical but more self-explanatory) in your own code. Invoke it as follows:
onRangeChange(myRangeInputElmt, myListener);
where myRangeInputElmt
is your desired <input type="range">
DOM element and myListener
is the listener/handler function you want invoked upon "change"
-like events.
Your listener may be parameter-less if desired or may use the event
parameter, i.e. either of the following would work, depending on your needs:
var myListener = function() {...
or
var myListener = function(evt) {...
(Removing the event listener from the input
element (e.g. using removeEventListener
) is not addressed in this answer.)
Demo Description:
In the code snippet below, the function onRangeChange
provides the universal solution. The rest of the code is simply an example to demonstrate its use. Any variable that begins with my...
is irrelevant to the universal solution and is only present for the sake of the demo.
The demo shows the range/slider value as well as the number of times the standard "change"
, "input"
and custom "onRangeChange"
events have fired (rows A, B and C respectively). When running this snippet in different browsers, note the following as you interact with the range/slider:
Demo Code:
// main function for emulating IE11's "change" event:_x000D_
_x000D_
function onRangeChange(rangeInputElmt, listener) {_x000D_
_x000D_
var inputEvtHasNeverFired = true;_x000D_
_x000D_
var rangeValue = {current: undefined, mostRecent: undefined};_x000D_
_x000D_
rangeInputElmt.addEventListener("input", function(evt) {_x000D_
inputEvtHasNeverFired = false;_x000D_
rangeValue.current = evt.target.value;_x000D_
if (rangeValue.current !== rangeValue.mostRecent) {_x000D_
listener(evt);_x000D_
}_x000D_
rangeValue.mostRecent = rangeValue.current;_x000D_
});_x000D_
_x000D_
rangeInputElmt.addEventListener("change", function(evt) {_x000D_
if (inputEvtHasNeverFired) {_x000D_
listener(evt);_x000D_
}_x000D_
}); _x000D_
_x000D_
}_x000D_
_x000D_
// example usage:_x000D_
_x000D_
var myRangeInputElmt = document.querySelector("input" );_x000D_
var myRangeValPar = document.querySelector("#rangeValPar" );_x000D_
var myNumChgEvtsCell = document.querySelector("#numChgEvtsCell");_x000D_
var myNumInpEvtsCell = document.querySelector("#numInpEvtsCell");_x000D_
var myNumCusEvtsCell = document.querySelector("#numCusEvtsCell");_x000D_
_x000D_
var myNumEvts = {input: 0, change: 0, custom: 0};_x000D_
_x000D_
var myUpdate = function() {_x000D_
myNumChgEvtsCell.innerHTML = myNumEvts["change"];_x000D_
myNumInpEvtsCell.innerHTML = myNumEvts["input" ];_x000D_
myNumCusEvtsCell.innerHTML = myNumEvts["custom"];_x000D_
};_x000D_
_x000D_
["input", "change"].forEach(function(myEvtType) {_x000D_
myRangeInputElmt.addEventListener(myEvtType, function() {_x000D_
myNumEvts[myEvtType] += 1;_x000D_
myUpdate();_x000D_
});_x000D_
});_x000D_
_x000D_
var myListener = function(myEvt) {_x000D_
myNumEvts["custom"] += 1;_x000D_
myRangeValPar.innerHTML = "range value: " + myEvt.target.value;_x000D_
myUpdate();_x000D_
};_x000D_
_x000D_
onRangeChange(myRangeInputElmt, myListener);
_x000D_
table {_x000D_
border-collapse: collapse; _x000D_
}_x000D_
th, td {_x000D_
text-align: left;_x000D_
border: solid black 1px;_x000D_
padding: 5px 15px;_x000D_
}
_x000D_
<input type="range"/>_x000D_
<p id="rangeValPar">range value: 50</p>_x000D_
<table>_x000D_
<tr><th>row</th><th>event type </th><th>number of events </th><tr>_x000D_
<tr><td>A</td><td>standard "change" events </td><td id="numChgEvtsCell">0</td></tr>_x000D_
<tr><td>B</td><td>standard "input" events </td><td id="numInpEvtsCell">0</td></tr>_x000D_
<tr><td>C</td><td>new custom "onRangeChange" events</td><td id="numCusEvtsCell">0</td></tr>_x000D_
</table>
_x000D_
Credit:
While the implementation here is largely my own, it was inspired by MBourne's answer. That other answer suggested that the "input" and "change" events could be merged and that the resulting code would work in both desktop and mobile browsers. However, the code in that answer results in hidden "extra" events being fired, which in and of itself is problematic, and the events fired differ between browsers, a further problem. My implementation here solves those problems.
Keywords:
JavaScript input type range slider events change input browser compatability cross-browser desktop mobile no-jQuery
You could use the JavaScript "ondrag" event to fire continuously. It is better than "input" due to the following reasons:
Browser support.
Could differentiate between "ondrag" and "change" event. "input" fires for both drag and change.
In jQuery:
$('#sample').on('drag',function(e){
});
Reference: http://www.w3schools.com/TAgs/ev_ondrag.asp
I'm posting this as an answer because it deserves to be it's own answer rather than a comment under a less useful answer. I find this method much better than the accepted answer since it can keep all the js in a separate file from the HTML.
Answer provided by Jamrelian in his comment under the accepted answer.
$("#myelement").on("input change", function() {
//do something
});
Just be aware of this comment by Jaime though
Just note that with this solution, in chrome you will get two calls to the handler (one per event), so if you care for that, then you need to guard against it.
As in it will fire the event when you have stopped moving the mouse, and then again when you release the mouse button.
In relation to the change
event and input
event causing the functionality to trigger twice, this is pretty much a non-issue.
If you have a function firing off on input
, it is extremely unlikely that there will be a problem when the change
event fires.
input
fires rapidly as you drag a range input slider. Worrying about one more function call firing at the end is like worrying about a single drop of water compared to the ocean of water that is the input
events.
The reason for even including the change
event at all is for the sake of browser compatibility (mainly with IE).
I'm posting this as an answer in case you are like me and cannot figure out why the range type input doesn't work on ANY mobile browsers. If you develop mobile apps on your laptop and use the responsive mode to emulate touch, you will notice the range doesn't even move when you have the touch simulator activated. It starts moving when you deactivate it. I went on for 2 days trying every piece of code I could find on the subject and could not make it work for the life of me. I provide a WORKING solution in this post.
Mobile browsers run using a component called Webkit for iOS and WebView for Android. The WebView/WebKit enables you to embed a web browser, which does not have any chrome or firefox (browser) controls including window frames, menus, toolbars and scroll bars into your activity layout. In other words, mobile browsers lack a lot of web components normally found in regular browsers. This is the problem with the range type input. If the user's browser doesn't support range type, it will fall back and treat it as a text input. This is why you cannot move the range when the touch simulator is activated.
Read more here on browser compatibility
jQuery provides a slider that somehow works with touch simulation but it is choppy and not very smooth. It wasn't satisfying to me and it probably wont be for you either but you can make it work more smoothly if you combine it with jqueryUi.
If you develop hybrid apps on your laptop, there is a simple and easy library you can use to enable range type input to work with touch events.
This library is called Range Touch.
For more information on this issue check this thread here
Recreating the HTML5 range input for Mobile Safari (webkit)?
Andrew Willem's solutions are not mobile device compatible.
Here's a modification of his second solution that works in Edge, IE, Opera, FF, Chrome, iOS Safari and mobile equivalents (that I could test):
Update 1: Removed "requestAnimationFrame" portion, as I agree it's not necessary:
var listener = function() {
// do whatever
};
slider1.addEventListener("input", function() {
listener();
slider1.addEventListener("change", listener);
});
slider1.addEventListener("change", function() {
listener();
slider1.removeEventListener("input", listener);
});
Update 2: Response to Andrew's 2nd Jun 2016 updated answer:
Thanks, Andrew - that appears to work in every browser I could find (Win desktop: IE, Chrome, Opera, FF; Android Chrome, Opera and FF, iOS Safari).
Update 3: if ("oninput in slider) solution
The following appears to work across all the above browsers. (I cannot find the original source now.) I was using this, but it subsequently failed on IE and so I went looking for a different one, hence I ended up here.
if ("oninput" in slider1) {
slider1.addEventListener("input", function () {
// do whatever;
}, false);
}
But before I checked your solution, I noticed this was working again in IE - perhaps there was some other conflict.
Yet another approach - just set a flag on an element signaling which type of event should be handled:
function setRangeValueChangeHandler(rangeElement, handler) {
rangeElement.oninput = (event) => {
handler(event);
// Save flag that we are using onInput in current browser
event.target.onInputHasBeenCalled = true;
};
rangeElement.onchange = (event) => {
// Call only if we are not using onInput in current browser
if (!event.target.onInputHasBeenCalled) {
handler(event);
}
};
}
For a good cross-browser behavior, and understandable code, best is to use the onchange attribute in combination of a form:
function showVal(){
valBox.innerHTML = inVal.value;
}
_x000D_
<form onchange="showVal()">
<input type="range" min="5" max="10" step="1" id="inVal">
</form>
<span id="valBox"></span>
_x000D_
The same using oninput, the value is changed directly.
function showVal(){
valBox.innerHTML = inVal.value;
}
_x000D_
<form oninput="showVal()">
<input type="range" min="5" max="10" step="1" id="inVal">
</form>
<span id="valBox"></span>
_x000D_
Source: Stackoverflow.com