StackOverflow2013

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14329142
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2013-01-15T00:14:20.843
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2013-01-15T00:14:20.843
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<p>You can do two things:</p> <ol> <li>Approach the problem properly.</li> <li>Half-ass it.</li> </ol> <p>I will give the second instruction first because it should give you some undestanding of how these two technologies are related.</p> <h1>Half ass it</h1> <p>This assumes that the script you are writing is not Ajax-based - just some standard generate-page-with-PHP and include .js.</p> <ol> <li><p>Write a php file that will generate Javascript content: </p> <pre><code>// /js/vars.php $v1 = $v2 = $v3 = $v4 = time(); header("Content-type: text/javascript"); echo "window.Variables = { v1: $v1, v2: $v2, v3: $v3, v4: $v4 }"; </code></pre> <p>(note that if the variables are strings, you should add quotes)</p></li> <li><p>Require that file in <code><head></code> before the file you want to use the variables in.</p> <pre><code><script type="text/javascript src="/js/vars.php"> </code></pre></li> <li><p>Use it in your .js file.</p> <pre><code>var smth = Variables.v1 + Variables.v2; </code></pre></li> </ol> <p>How this is a no-no for many reasons, amongst them:</p> <ul> <li>JavaScript generated by a PHP file is not easily maintainable.</li> <li>The global JS namespace is somewhat messy.</li> <li>It does not play well with Ajax.</li> </ul> <h1>Proper</h1> <ol> <li><p>Write a php file that will generate JSON data:</p> <pre><code>// /js/vars.php $v1 = $v2 = $v3 = $v4 = time(); $jsonArr = array( 'v1'=> $v1, 'v2'=> $v2, 'v3'=> $v3, 'v4'=> $v4 ); header("Content-type: application/json"); echo json_encode($jsonArr); </code></pre></li> <li><p>Write some JavaScript code that will pull the data using Ajax. Eg. using jQuery:</p> <pre><code>$.getJSON('js/vars.php', function(data) { alert(data.v1+data.v2); }); </code></pre></li> </ol>
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1. POUse a variable I made in a .php document within a separate .js document
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1. USGregPK
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