GSharper

Wednesday, 14 March 2007

Javascript Select/Unselect All Checkboxes

Another much used Javascript function is the one where we want to select/unselect a bunch of checkboxes on screen using client side scripting. Again, I inject the script in my code behind

private void InjectJavascript()
{
string toggleCheckboxes =

@"<script type=""text/javascript"">function SetAllCheckBoxes(formValue, checkValue)
{
var theForm;
var countElements;
var objElements;

theForm = document.forms[formValue];
if(!theForm)
return;

objElements = theForm.getElementsByTagName('input');
if(!objElements)
return;

countElements = objElements.length;
// set the check value for all check boxes
for(var i = 0; i < countElements; i++)
{
if (objElements[i].type == 'checkbox')
{
objElements[i].checked = checkValue;
}
}
}
</script>
";

ClientScript.RegisterClientScriptBlock(this.GetType(), "toggleCheckboxes", toggleCheckboxes);

// Wire some javascript client-side events
rbtnSelectAllCheckBoxes.Attributes.Add("onclick", "SetAllCheckBoxes('" + this.Form.ClientID + "',true)");

rbtnUnSelectAllCheckBoxes.Attributes.Add("onclick", "SetAllCheckBoxes('" + this.Form.ClientID + "',false)");
}


Call this void in the Page Load.Add a couple of checkboxes and two radiobuttons to the page.

Name the radiobuttons "rbtnSelectAllCheckBoxes" and "rbtnUnSelectAllCheckBoxes".Give it a try.

Greetz,
G

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