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POJQuery $.ajax "async: false" bug?
 

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    <p>I would appreciate your opinion/advice on the following</p> <p><strong>Scenario</strong> </p> <p>HTML has PDF file nick name, back end has URL for each nick. </p> <p>The link URL is always download.php?what=%PDF_Nick% to ensure download for JS disabled clients. </p> <p>For JS enabled clients I do JQuery AJAX call and rewrite link URL from download.php?what=%PDF_Nick% to <a href="http://mysite.com/requestedPFF.pdf" rel="nofollow noreferrer">http://mysite.com/requestedPFF.pdf</a> to activate download from the client. I set "async: false" to allow AJAX get new url.</p> <p><strong>Problem</strong></p> <p>AJAX returns valid script rewriting JS url variable, but location.href runs again to the initial url, creating extra back end call</p> <p>Do you think it's related to the bug ignoring "async: false," definition or it's mistake I've made and missed to catch?</p> <p>Thank you in advance</p> <h1>HTML code</h1> <pre> &lt;a href="/download.php?what=PDF_A" onclick="javascript:download ('PDF_A')">Download&lt;/a> </pre> <h1>JS code</h1> <pre> function download ( what ) { var url = "download.php?what="+what; $.ajax({ type: "GET", url: "download.php?ajax=true", data: "what=" + what async: false, dataType: "script" }); // if AJAX got the download URL I expect actual download to start: location.href = url; } </pre> <h1>Back end (download.php) code</h1> <pre> $myPDF = array(); $myPDF["PDF_A"] = "PDF_A.pdf"; .... $url = "http://mysite.com/" . $myPDF["PDF_A"]; ... if ( $_GET["ajax"] === "true" ) { // overwrite JS url variable print('url = "'.$url.'";'); } else { header("Location: ". $url ); header("Connection: close"); } </pre>
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