onClick to get the ID of the clicked button
JavascriptHtmlJavascript Problem Overview
How do find the id of the button which is being clicked?
<button id="1" onClick="reply_click()"></button>
<button id="2" onClick="reply_click()"></button>
<button id="3" onClick="reply_click()"></button>
function reply_click()
{
}
Javascript Solutions
Solution 1 - Javascript
You need to send the ID as the function parameters. Do it like this:
<button id="1" onClick="reply_click(this.id)">B1</button>
<button id="2" onClick="reply_click(this.id)">B2</button>
<button id="3" onClick="reply_click(this.id)">B3</button>
<script type="text/javascript">
function reply_click(clicked_id)
{
alert(clicked_id);
}
</script>
This will send the ID this.id
as clicked_id
which you can use in your function. See it in action here.
Solution 2 - Javascript
In general, things are easier to keep organized if you separate your code and your markup. Define all of your elements, and then in your JavaScript section, define the various actions that should be performed on those elements.
When an event handler is called, it's called within the context of the element that was clicked on. So, the identifier this will refer to the DOM element that you clicked on. You can then access attributes of the element through that identifier.
For example:
<button id="1">Button 1</button>
<button id="2">Button 2</button>
<button id="3">Button 3</button>
<script type="text/javascript">
var reply_click = function()
{
alert("Button clicked, id "+this.id+", text"+this.innerHTML);
}
document.getElementById('1').onclick = reply_click;
document.getElementById('2').onclick = reply_click;
document.getElementById('3').onclick = reply_click;
</script>
Solution 3 - Javascript
USING PURE JAVASCRIPT: I know it's late but may be for the future people it can help:
In the HTML part:
<button id="1" onClick="reply_click()"></button>
<button id="2" onClick="reply_click()"></button>
<button id="3" onClick="reply_click()"></button>
In the Javascipt Controller:
function reply_click()
{
alert(event.srcElement.id);
}
This way we don't have to bind the 'id' of the Element at the time of calling the javascript function.
Solution 4 - Javascript
(I think the id
attribute needs to start with a letter. Could be wrong.)
You could go for event delegation...
<div onClick="reply_click()">
<button id="1"></button>
<button id="2"></button>
<button id="3"></button>
</div>
function reply_click(e) {
e = e || window.event;
e = e.target || e.srcElement;
if (e.nodeName === 'BUTTON') {
alert(e.id);
}
}
...but that requires you to be relatively comfortable with the wacky event model.
Solution 5 - Javascript
<button id="1" onClick="reply_click(this)"></button>
<button id="2" onClick="reply_click(this)"></button>
<button id="3" onClick="reply_click(this)"></button>
function reply_click(obj)
{
var id = obj.id;
}
Solution 6 - Javascript
<button id="1" class="clickMe"></button>
<button id="2" class="clickMe"></button>
<button id="3" class="clickMe"></button>
<script>
$('.clickMe').click(function(){
alert(this.id);
});
</script>
Solution 7 - Javascript
How to do it without inline JavaScript or external libraries
it is generally recommended to avoid inline JavaScript, but rarely is there an example of how to do it.
Here is my way of attaching events to buttons.
I'm not entirely happy with how much longer the recommended method is compared to a simple onClick
attribute.
Modern browsers
- Works before the document has finished loading.
- Very efficient.
- Separates JS from HTML.
- JS is in the
<head>
const OnEvent = (doc) => {
return {
on: (type, selector, callback) => {
doc.addEventListener(type, (event)=>{
if(!event.target.matches(selector)) return;
callback.call(event.target, event);
}, false);
}
}
};
OnEvent(document).on('click', '.btn', function (e) {
let div = document.createElement("div");
div.innerHTML = "click " + e.target.id + "!";
document.body.appendChild(div);
});
<button id="b1" class="btn">Button 1</button>
<button id="b2" class="btn">Button 2</button>
<button id="b3">Do nothing</button>
2014 browsers only
<button class="btn" id="b1">Button</button>
<script>
let OnEvent = (doc) => {
return {
on: (event, className, callback) => {
doc.addEventListener('click', (event)=>{
if(!event.target.classList.contains(className)) return;
callback.call(event.target, event);
}, false);
}
}
};
OnEvent(document).on('click', 'btn', function (e) {
window.console.log(this.id, e);
});
</script>
2013 browsers only
<!DOCTYPE html>
<html>
<head>
<script>
(function(doc){
var hasClass = function(el,className) {
return el.classList.contains(className);
}
doc.addEventListener('click', function(e){
if(hasClass(e.target, 'click-me')){
e.preventDefault();
doSomething.call(e.target, e);
}
});
})(document);
function insertHTML(str){
var s = document.getElementsByTagName('script'), lastScript = s[s.length-1];
lastScript.insertAdjacentHTML("beforebegin", str);
}
function doSomething(event){
console.log(this.id); // this will be the clicked element
}
</script>
<!--... other head stuff ...-->
</head>
<body>
<!--Best if you inject the button element with javascript if you plan to support users with javascript disabled-->
<script>
insertHTML('<button class="click-me" id="btn1">Button 1</button>');
</script>
<!--Use this when you don't care about broken buttons when javascript is disabled.-->
<!--buttons can be used outside of forms https://stackoverflow.com/a/14461672/175071 -->
<button class="click-me" id="btn2">Button 2</button>
<input class="click-me" type="button" value="Button 3" id="btn3">
<!--Use this when you want to lead the user somewhere when javascript is disabled-->
<a class="click-me" href="/path/to/non-js/action" id="btn4">Button 4</a>
</body>
</html>
Cross-browser
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
(function(doc){
var cb_addEventListener = function(obj, evt, fnc) {
// W3C model
if (obj.addEventListener) {
obj.addEventListener(evt, fnc, false);
return true;
}
// Microsoft model
else if (obj.attachEvent) {
return obj.attachEvent('on' + evt, fnc);
}
// Browser don't support W3C or MSFT model, go on with traditional
else {
evt = 'on'+evt;
if(typeof obj[evt] === 'function'){
// Object already has a function on traditional
// Let's wrap it with our own function inside another function
fnc = (function(f1,f2){
return function(){
f1.apply(this,arguments);
f2.apply(this,arguments);
}
})(obj[evt], fnc);
}
obj[evt] = fnc;
return true;
}
return false;
};
var hasClass = function(el,className) {
return (' ' + el.className + ' ').indexOf(' ' + className + ' ') > -1;
}
cb_addEventListener(doc, 'click', function(e){
if(hasClass(e.target, 'click-me')){
e.preventDefault ? e.preventDefault() : e.returnValue = false;
doSomething.call(e.target, e);
}
});
})(document);
function insertHTML(str){
var s = document.getElementsByTagName('script'), lastScript = s[s.length-1];
lastScript.insertAdjacentHTML("beforebegin", str);
}
function doSomething(event){
console.log(this.id); // this will be the clicked element
}
</script>
<!--... other head stuff ...-->
</head>
<body>
<!--Best if you inject the button element with javascript if you plan to support users with javascript disabled-->
<script type="text/javascript">
insertHTML('<button class="click-me" id="btn1">Button 1</button>');
</script>
<!--Use this when you don't care about broken buttons when javascript is disabled.-->
<!--buttons can be used outside of forms https://stackoverflow.com/a/14461672/175071 -->
<button class="click-me" id="btn2">Button 2</button>
<input class="click-me" type="button" value="Button 3" id="btn3">
<!--Use this when you want to lead the user somewhere when javascript is disabled-->
<a class="click-me" href="/path/to/non-js/action" id="btn4">Button 4</a>
</body>
</html>
Cross-browser with jQuery
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
(function($){
$(document).on('click', '.click-me', function(e){
doSomething.call(this, e);
});
})(jQuery);
function insertHTML(str){
var s = document.getElementsByTagName('script'), lastScript = s[s.length-1];
lastScript.insertAdjacentHTML("beforebegin", str);
}
function doSomething(event){
console.log(this.id); // this will be the clicked element
}
</script>
<!--... other head stuff ...-->
</head>
<body>
<!--Best if you inject the button element with javascript if you plan to support users with javascript disabled-->
<script type="text/javascript">
insertHTML('<button class="click-me" id="btn1">Button 1</button>');
</script>
<!--Use this when you don't care about broken buttons when javascript is disabled.-->
<!--buttons can be used outside of forms https://stackoverflow.com/a/14461672/175071 -->
<button class="click-me" id="btn2">Button 2</button>
<input class="click-me" type="button" value="Button 3" id="btn3">
<!--Use this when you want to lead the user somewhere when javascript is disabled-->
<a class="click-me" href="/path/to/non-js/action" id="btn4">Button 4</a>
</body>
</html>
You can run this before the document is ready, clicking the buttons will work because we attach the event to the document.
Here is a jsfiddle
For some strange reason the insertHTML
function does not work in it even though it works in all my browsers.
You can always replace insertHTML
with document.write
if you don't mind it's drawbacks
<script>
document.write('<button class="click-me" id="btn1">Button 1</button>');
</script>
Sources:
- https://stackoverflow.com/questions/4537963/what-are-alternatives-to-document-write
- https://stackoverflow.com/questions/5898656/test-if-an-element-contains-a-class
- https://stackoverflow.com/questions/1000597/event-preventdefault-function-not-working-in-ie
- https://gist.github.com/eduardocereto/955642
Solution 8 - Javascript
If you don't want to pass any arguments to the onclick function, just use event.target
to get the clicked element:
<button id="1" onClick="reply_click()"></button>
<button id="2" onClick="reply_click()"></button>
<button id="3" onClick="reply_click()"></button>
function reply_click()
{
// event.target is the element that is clicked (button in this case).
console.log(event.target.id);
}
Solution 9 - Javascript
With pure javascript you can do the following:
var buttons = document.getElementsByTagName("button");
var buttonsCount = buttons.length;
for (var i = 0; i < buttonsCount; i += 1) {
buttons[i].onclick = function(e) {
alert(this.id);
};
}
check it On JsFiddle
Solution 10 - Javascript
<button id="1" onClick="reply_click()"></button>
<button id="2" onClick="reply_click()"></button>
<button id="3" onClick="reply_click()"></button>
function reply_click()
{
console.log(window.event.target.id)
}
Solution 11 - Javascript
You can simply do it this way:
<input type="button" id="1234" onclick="showId(this.id)" value="click me to show my id"/>
<script type="text/javascript">
function showId(obj) {
var id=obj;
alert(id);
}
Solution 12 - Javascript
This is improvement of Prateek answer - event is pass by parameter so reply_click not need to use global variable (and as far no body presents this variant)
function reply_click(e) {
console.log(e.target.id);
}
<button id="1" onClick="reply_click(event)">B1</button>
<button id="2" onClick="reply_click(event)">B2</button>
<button id="3" onClick="reply_click(event)">B3</button>
Solution 13 - Javascript
Button 1 Button 2 Button 3
var reply_click = function() {
alert("Button clicked, id "+this.id+", text"+this.innerHTML);
}
document.getElementById('1').onclick = reply_click;
document.getElementById('2').onclick = reply_click;
document.getElementById('3').onclick = reply_click;
Solution 14 - Javascript
<button id="1"class="clickMe"></button>
<button id="2" class="clickMe"></button>
<button id="3" class="clickMe"></button>
$('.clickMe').live('click',function(){
var clickedID = this.id;
});
Solution 15 - Javascript
Sorry its a late answer but its really quick if you do this :-
$(document).ready(function() {
$('button').on('click', function() {
alert (this.id);
});
});
This gets the ID of any button clicked.
If you want to just get value of button clicked in a certain place, just put them in container like
<div id = "myButtons"> buttons here </div>
and change the code to :-
$(document).ready(function() {
$('.myButtons button').on('click', function() {
alert (this.id);
});
});
I hope this helps
Solution 16 - Javascript
This will log the id of the element that's been clicked: addFields.
<button id="addFields" onclick="addFields()">+</button>
<script>
function addFields(){
console.log(event.toElement.id)
}
</script>
Solution 17 - Javascript
Although it's 8+ years late, in reply to @Amc_rtty, to get dynamically generated IDs from (my) HTML, I used the index of the php loop to increment the button IDs. I concatenated the same indices to the ID of the input element, hence I ended up with id="tableview1" and button id="1" and so on.
$tableView .= "<td><input type='hidden' value='http://".$_SERVER['HTTP_HOST']."/sql/update.php?id=".$mysql_rows[0]."&table=".$theTable."'id='tableview".$mysql_rows[0]."'><button type='button' onclick='loadDoc(event)' id='".$mysql_rows[0]."'>Edit</button></td>";
In the javascript, I stored the button click in a variable and added it to the element.
function loadDoc(e) {
var btn = e.target.id;
var xhttp = new XMLHttpRequest();
var page = document.getElementById("tableview"+btn).value;
//other Ajax stuff
}