Get Clicked from

问题:

As a relative beginner with JS, I am struggling to try and find a solution to this.

I need to find out which line of an unordered list was clicked

<ul onclick="alert(this.clicked.line.id);">
  <li id=l1>Line 1</li>
  <li id=l2>Line 2</li>
  <li id=l3>Line 3</li>
</ul>

I don't really want to add a onclick event to each individual line, I'm sure there must be a way ??

回答1:

You can use event.target for this:

JS:

// IE does not know about the target attribute. It looks for srcElement
// This function will get the event target in a browser-compatible way
function getEventTarget(e) {
    e = e || window.event;
    return e.target || e.srcElement; 
}

var ul = document.getElementById('test');
ul.onclick = function(event) {
    var target = getEventTarget(event);
    alert(target.innerHTML);
};

HTML:

<ul id="test">
    <li>Item 1</li>
    <li>Item 2</li>
    <li>Item 3</li>
</ul>

Example: http://jsfiddle.net/ArondeParon/2dEFg/5/

Please note that this is a very basic example and you will likely encounter some problems when you delegate events to elements containing more than one level. When this happens, you will have to traverse the DOM tree upwards to find the containing element.

回答2:

The object which was actually clicked is

event.target

inside the onclick callback. What you are trying to do is a good idea, and it is known as event delegation.

http://jsfiddle.net/VhfEh/

回答3:

You can use event.target for this:

Did not seem to be working so I made small change seems to be working now.

var ul = document.getElementById('test');
ul.onclick = function(event) {
    var target = event.target;
    alert(event.target.innerHTML);
};  

回答4:

//The simplest way to do this might be to append a query parameter to your links:

<ul>
 <li><a href="Line 1">Line 1</a></li>
 <li><a href="Line 2">Line 2</a></li>
 <li><a href="Line 3">Line 3</a></li>
</ul>

回答5:

If you want exact value of element then following code can work.Use innerText except innerHTML JS:

function getEventTarget(e) {
    e = e || window.event;
    return e.target || e.srcElement; 
}

var ul = document.getElementById('test');
    ul.onclick = function(event) {
var target = getEventTarget(event);
    alert(target.innerText);
};

HTML:

<ul id="test">
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3</li>