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POSending a variable from javascript to php to be checked and back to javascript
 

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  1. POSending a variable from javascript to php to be checked and back to javascript
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    <p>I am using JavaScript to validate my form. It's basic validation. The step I am having problems with it sending the synum variable via post from java script to my php page valid_synum.php where I do a pdo look up to check if that synum exists or not then I echo a 1 or a 0 based on the result. I want the java script to take that result and either send an alert error or if ok allow the form to submit. Here is the javascript I have. As far as I can tell the POST call </p> <blockquote> <p>$.post("valid_synum.php", { synum: synum },</p> </blockquote> <p>is never called up. I placed a test in the php page and the test never gets activated from the script. It works fine if I load the php directly in a browser. </p> <p>Any help would be greatly appreciated. </p> <pre><code>&lt;script&gt; function isNumber(input) { return (input - 0) == input &amp;&amp; (input+'').replace(/^\s+|\s+$/g, "").length &gt; 0; } function checkForm(f) { if (f.elements['worknum'].value != "") { if ((isNumber(f.elements['worknum'].value)) == false) { alert("The Work Order Number is not valid") return false; } var chars = 6; if((f.elements['worknum'].value).length != 6) { alert("The Work Order Number is not 6 digits") return false; } } if (f.elements['synum'].value == "") { alert("Please Enter the Store Number"); return false; } if (f.elements['worknum'].value == "") { alert("Please Enter the Work Order Number"); return false; } if (f.elements['synum'].value != "") { //get the username var synum = (f.elements['synum'].value); $.post("valid_synum.php", { synum: synum }, function(result){ //if the result is 1 if(result == 1){ //do nothing valid synum alert("Good") return false; }else{ //show that the username is NOT available alert("The store number is NOT valid. Please Enter full store number") return false; } }); } else { f.submit(); return false; } } &lt;/script&gt; </code></pre> <p>Here is my php page code:</p> <pre><code>$id=$_POST['synum']; try{ $conn = new PDO( "sqlsrv:Server= $eautoserver ; Database = $eautodb ", $eautouser, $eautopwd); $conn-&gt;setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION ); $stmt = $conn-&gt;prepare('SELECT * FROM vw_DCR_Web_Customer_Query WHERE CustomerNumber= :id'); $stmt-&gt;execute(array('id' =&gt; $id)); $row = $stmt-&gt;fetch(); } catch(PDOException $e) { echo 'ERROR: ' . $e-&gt;getMessage(); } if ($row){ echo 1; $email_body="1"; }else{ echo 0; $email_body="0"; } </code></pre>
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    1. COIf you put an alert before the .post, does it display the alert? Meaning, does it even get to the post code?
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    2. COYes if I do alert(synum); just before the $.post it does show me what was entered. All the other error checking that the java script does works fine. It's just this one piece that doesn't seem to activate. I placed code on the php to send a email if it is accessed just to test if the page was being accessed and it is not.
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    3. CODo you have any errors in the console?
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