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POPrototype vs jQuery: A specific problem regarding binding, events and values
 

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    <p>I'm looking at transferring existing functionality (built with PrototypeJS) to jQuery and have been working through a couple of examples.</p> <p>One example I'm a bit stuck on, specifically with regards to binding functions (and values) to an event. This example tries to apply a mouseover event, with an incremented value to a list of links. The value that is alerted I want to be the same every time (so link 1 alerts "1", link 2 alert "2" etc etc)</p> <p>Here's a snippet of a simple example.</p> <p>Prototype:</p> <pre><code>findLinks: function () { i = 1; $$("#vertical-content-links ul li a").each(function (s) { Event.observe(s, "mouseover", this.activateLink.bindAsEventListener(this, i)) i++ }.bind(this)) }, activateLink: function (e, i) { alert(i) } </code></pre> <p>Within this example, when link 1 is mouseovered, it will always alert "1". Link 2 will always alert "2" etc etc as it is alerting the value of i when the function is applied to that event.</p> <p>However, my similar code in jQuery....</p> <pre><code>findLinks: function () { i = 1; $("#vertical-content-links ul li a").each(function (s, elmt) { $(elmt).bind("mouseover", function (e) { _this.activateLink(i); i++ }) }) }, activateLink: function (i) { alert(i); } </code></pre> <p>(Note: _this is a closure specified elsewhere in the code)</p> <p>When this runs, every time a link is mouseovered, the value of i is incremented by one, so link 1 will alert 1, then 2,3,4,5 etc as the value of i doesn't seem to be bound to the function when it is applied to the event</p> <p>Hope that makes sense</p> <p>Does anyone know a way around this so it works more the way Prototype does. I really want to start using jQuery more but need to understand this issue first.</p> <p>Cheers</p>
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    1. COI converted our ERP app to jQuery from Prototype... best decision we've ever made, code extensibility, readability and performance all increasing substantially :-)
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      1. USBen Everard
    2. COThanks for such a quick response guys. Nick's solution below seems to be the simplest fix. I love prototype but am aware that jQuery has just exploded in popularity in the past couple of years (we've used prototype for nearly 4 years!) so we've got to consider making the jump
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