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    <p>What's wrong with this:</p> <pre><code>window.open("graph.php?mach_id=" + machineId); </code></pre> <p>If the (unexplained) problem is that you need to save the value of <code>machineId</code> at the time the <code>ondblclick</code> handler is <em>defined</em> rather than using its value at the time the handler is <em>executed</em>, you need a closure:</p> <pre><code>(function (id) { rect.node.ondblclick = function() { window.open("graph.php?mach_id=" + id); } })(machineId); </code></pre> <p><strong>UPDATE:</strong> OK, based on the new code you posted I can see I was on the right track with the closure idea above. The problem is that your event handlers try to use the <code>i</code> index at some point in the future at which time <code>i</code> equals whatever value it had when the loop ended. You need something like this:</p> <pre><code>function showUtilization(machineId, rectUtil, txtResult, txtMCName, rectCover) { for (var index = 0; index &lt; machineId.length; index++) { (function(i){ $.ajax({ // all of your other code here, where anytime it // uses i it will be using the parameter of the // anonymous function rather than the loop counter // (which I've renamed to "index" to avoid confusion // with "i") }); })(index); } } </code></pre> <p>I've changed the loop to use a counter called <code>index</code>, which is passed in to an anonymous function that is immediately executed. Your existing code, i.e., everything that you have inside the <code>$.ajax({ });</code> call goes inside that anonymous function. When your success and ondblclick handlers are executed at some point in the future they will use the <code>i</code> from their own closure rather than the loop index. </p>
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    1. POHow can I pass parameter
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    1. COthe result is localhost/graph.php?mach_id=undefine
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    2. COWell there must be more to your code than what you posted so if you want more help you'll have to show (at least) the function that your code is in and how it is called. (You can see all of the other answers agreed with the first part of mine, so I don't think I'm misreading what you already posted. I can't tell if the second part of my answer applies without seeing the context of your sample code.)
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    3. CONow you can see the rest of my code
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