Ajax PHP wont retrieve address bar variable -

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this question has answer here:

my current website address reads: www.mysite.com/index.php?user=123

i click link active ajax page open. ajax page contains following:

$usernum = $_get["user"]; $result = mysql_query("select * persons user = $usernum");

this produces error:

warning: mysql_fetch_array() expects parameter 1 resource, boolean given in c:\program files (x86)\ampps\www\social2\profile\indexbasics.php on line 29

no error ocurrs if hard code in user number though, refuses address bar variable.

help? advice?

----- added info ------

<script> window.onload = function () {     var basics = document.getelementbyid('basics'),         favorites = document.getelementbyid('favorites');      basics.onclick = function() {         loadxmldoc('indexbasics');         var otherclasses = favorites.classname;         if (otherclasses.contains("active")) {             basics.classname = 'statusoptionactive';             favorites.classname = 'statusoption';         }     }      favorites.onclick = function() {         loadxmldoc('indexfav');                 var otherclasses = basics.classname;         if (otherclasses.contains("active")) {             favorites.classname = 'statusoptionactive';             basics.classname = 'statusoption';         }     }      function loadxmldoc(pagename)     {         var xmlhttp;         if (window.xmlhttprequest)           {// code ie7+, firefox, chrome, opera, safari           xmlhttp=new xmlhttprequest();           }         else           {// code ie6, ie5           xmlhttp=new activexobject("microsoft.xmlhttp");         }     xmlhttp.onreadystatechange=function()           {           if (xmlhttp.readystate==4 && xmlhttp.status==200)             {             document.getelementbyid("centrecont").innerhtml=xmlhttp.responsetext;             }           }         xmlhttp.open("get","../profile/" + pagename + ".php",true);         xmlhttp.send();         } } </script>

so you're saying on www.mysite.com/index.php?user=123 when click on button (or whatever fire ajax event), load different url, can www.mysite.com/myajaxpage.php.

in case, may have forget pass user parameter ajax request. can't access $_get['user'] in myajaxpage.php because isn't defined in url.

code example

if you're using jquery, can trick:

$.urlparam = function(name){     var results = new regexp('[\\?&amp;]' + name + '=([^&amp;#]*)').exec(window.location.href);     return results[1] || 0; }  // ....  $.post('myajaxpage.php', {'user': $.urlparam('user')}, function(data) {    // stuff });

edit: author uses vanilla js, example pointless.


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