Checking dynamic checkboxes -- first checkbox checked 1

TeaAddictedGeek · Jan 10, 2006

How does one check if a checkbox is checked if you don't necessarily know the name or ID of the checkbox (dynamically created). Say you want to make sure the first checkbox in the form is checked before submitting the form. Is this possible?

"The computer programmer is a creator of universes for which he alone is responsible. Universes of virtually unlimited complexity can be created in the form of computer programs."
-Joseph Weizenbaum

kaht · Jan 10, 2006

Use the getElementsByTagName collection to grab all inputs and then check to make sure the type is checkbox. Here's an example:

Code:

<html>
<head>
<script type="text/javascript">

function createCheckbox() {
   document.getElementById("theDiv").innerHTML = "<input type=\"checkbox\" />checkbox1<br /><input type=\"checkbox\" />checkbox2";
}

function validateMe(frm) {
   [!]chks = document.getElementsByTagName("input");[/!]
   var i = 0;
   for (i = 0; i < chks.length; i++) {
      //check to see if we found the FIRST checkbox
      [!]if (chks[i].type = "checkbox") {[/!]
         //check to see if the first checkbox was checked
         if (chks[i].checked) {
            alert("first checkbox on the form was checked, submission proceeding");
            return true;
         }
         else {
            alert("the first checkbox on the form must be checked when submitting");
            return false;
         }
      }
   }
   alert("no checkboxes found");
   return false;
}

</script>
</head>

<body onload="createCheckbox()">
   <form onsubmit="return validateMe(this)" method="get" action="">
      <div id="theDiv"></div>
      <input type="submit" value="submit me" />
   </form>
</body>
</html>

-kaht

How much you wanna make a bet I can throw a football over them mountains?

kaht · Jan 10, 2006

omg, haven't done that in years......

this:

Code:

if (chks[i].type = "checkbox") {

should be:

Code:

if (chks[i].type [!]==[/!] "checkbox") {

-kaht

How much you wanna make a bet I can throw a football over them mountains?

TeaAddictedGeek · Jan 11, 2006

Thanks a million! It works.

"The computer programmer is a creator of universes for which he alone is responsible. Universes of virtually unlimited complexity can be created in the form of computer programs."
-Joseph Weizenbaum

kaht · Jan 11, 2006

no problem [thumbsup2]

-kaht

How much you wanna make a bet I can throw a football over them mountains?

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Checking dynamic checkboxes -- first checkbox checked 1

TeaAddictedGeek

Programmer

kaht

Programmer

kaht

Programmer

TeaAddictedGeek

Programmer

kaht

Programmer

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