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post javascript variable and selectlist value simultaneously to php file

Posted on 2009-07-15
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Last Modified: 2012-05-07
I have an html form with a select list and a submit button. I want to pass both the select list value and a separate javascript variable to the same php file simultaneously on the click of the submit button. Can anyone point me in the right direction?
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Question by:geoffcoles
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6 Comments
 
LVL 12

Expert Comment

by:Barry Jones
ID: 24858572
Use the form onsubmit handler to set a hidden form input elements' value to that of the javascript variable before posting.  See code below (untested):
<script type="text/javascript">
  fnPostForm = function(){
    var frm = document.getElementById("frmThis");
    var js_var = document.getElementById("js_variable");
    js_var.value = my_javascript_variable;
    frm.submit();
    return true;
  }
</script>
 
<form id="frmThis" action="script.php" method="post" onsubmit="return fnPostForm();">
  <fieldset>
    <input id="js_variable" name="js_variable" value="" />
    ...
      Other form fields, selects etc
    ...
    <input type="submit" id="cmdSubmit" value="Submit" />
  </fieldset>
</form>

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LVL 12

Expert Comment

by:Barry Jones
ID: 24858584
Actually you dont need the line frm.submit() in the above code..
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LVL 12

Accepted Solution

by:
Barry Jones earned 250 total points
ID: 24858590

<script type="text/javascript">
  fnPostForm = function(){
    document.getElementById("js_variable").value = my_javascript_variable;
    return true;
  }
</script>
 
<form id="frmThis" action="script.php" method="post" onsubmit="return fnPostForm();">
  <fieldset>
    <input id="js_variable" name="js_variable" value="" />
    ...
      Other form fields, selects etc
    ...
    <input type="submit" id="cmdSubmit" value="Submit" />
  </fieldset>
</form>

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LVL 14

Expert Comment

by:profya
ID: 24858902
Try this simple code:
</script>
<form mathod="post" action="target.php" name="form1" onsubmit="return function1();">
<select name="select1">
<option value="1">1</option>
<option value="2">2</option>
</select>
<input type="hidden" name="myvar" >
<input type="submit" value="submit">
</form>

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0
 
LVL 14

Expert Comment

by:profya
ID: 24858911
Sorry,
<script type="text/javascript">
function function1()
{
	document.forms[0].elements['myvar'].value="new value";
	return true;
}
</script>
<form mathod="post" action="target.php" name="form1" onsubmit="return function1();">
<select name="select1">
<option value="1">1</option>
<option value="2">2</option>
</select>
<input type="hidden" name="myvar" >
<input type="submit" value="submit">
</form>

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0
 

Author Closing Comment

by:geoffcoles
ID: 31603682
Thanks so much for this solution!
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