Node: Delegating Node Events
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+ This example demonstrates using a single event listener on a list to delegate clicks on the list items.
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- click me if you don't mind... +
- click me if you don't mind... +
- click me if you don't mind... +
- click me if you don't mind... +
Setting up the HTML
+First we need some HTML to work with.
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<ul id="demo"> + <li>click me if you don't mind...</li> + <li>click me if you don't mind...</li> + <li>click me if you don't mind...</li> + <li>click me if you don't mind...</li> +</ul>
Geting a NodeList Instance
+We will use the all method of our YUI instance to get a NodeList instance to work with.
var nodes = Y.all('#demo li');
Delegating Node Events
+In this example, we will listen for a click event on the list and handle it at the item level and use information from the event object to update the nodes.
var onClick = function(e) { + e.currentTarget.addClass('yui-pass'); // e.currentTarget === #demo li + e.target.setContent('thanks for the click!'); // e.target === #demo li or #demo li em + e.container.setStyle('border', '5px solid blue'); // e.container === #demo + + nodes.filter(':not(.yui-pass)').setContent('Click me too please!'); +};
Now we just assign the handler to the UL using the delegate method to handle clicks on each LI.
Y.one('#demo').delegate('click', onClick, 'li');
Full Script Source
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<script type="text/javascript"> +YUI().use('node', function(Y) { + var nodes = Y.all('#demo li'); + + var onClick = function(e) { + e.currentTarget.addClass('yui-pass'); // e.currentTarget === #demo li + e.target.setContent('thanks for the click!'); // e.target === #demo li or #demo li em + e.container.setStyle('border', '5px solid blue'); // e.container === #demo + + nodes.filter(':not(.yui-pass)').setContent('Click me too please!'); + }; + + Y.one('#demo').delegate('click', onClick, 'li'); +}); +</script>
