CODEWITHSUNDEEP
javascriptajax
ader277
ader277

Reputation: 35

modify a javascript code using ajax

well i have this javascript code :

<div id="change">
   <script>
      var change=0;
   </script>     
</div>

and I use ajax to update it. In fact when I update my database I want to alter the variable 'change' to the value 1.:

function update(value,username,competency)
{

   if (window.XMLHttpRequest)
   {// code for IE7+, Firefox, Chrome, Opera, Safari
      xmlhttp=new XMLHttpRequest();
   }
   else
   {// code for IE6, IE5
      xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
   }
   xmlhttp.onreadystatechange=function()
   {
      if (xmlhttp.readyState==4 && xmlhttp.status==200)
      {
         document.getElementById("updateAll").innerHTML=xmlhttp.responseText; 
         document.getElementById("change").innerHTML='<script >var change=1</script> '; 
      }
   };
   xmlhttp.open("GET","Update_evaluation_ajax.php?value="+value+"&username="+username+"&competency="+competency,true);
   xmlhttp.send(null); 
}

Can you help me figure out why this does not work?

Upvotes: 0

Views: 1027

Answers (2)

roryf
roryf

Reputation: 30170

When your initial <script> tag is executed, it creates a global variable change that can be accessed via window.change.

Presumably you're expecting to use the change variable elsewhere in your code. Without seeing that code it's difficult to suggest a good solution, but you can simply set window.change inside you response function and any subsequent code that's executed will use the updated value (depending on scope):

function () {
  if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
  {
     document.getElementById("updateAll").innerHTML = xmlhttp.responseText; 
     window.change = 1;
  }
};

Of course global variables are bad, but that's outside the scope of this answer.

Upvotes: 0

Niet the Dark Absol
Niet the Dark Absol

Reputation: 324790

<script> tags added with innerHTML are NOT executed.

Why not just set change = 1 instead of setting the innerHTML? It looks like change is a global variable, so you can change it from anywhere.

Upvotes: 1

Related Questions