[Javascript] select all checkboxes script

[Cutter]

Here's something I recently contributed to a project a friend of mine 
gives away...

Hope it helps,
Cutter

<!---
//    Author:        Steve 'Cutter' Blades
//    Revision:    Add js scripting for a 'Select All' type checkbox
//                Aside from the below javascript the following line are 
required:
//                on the 'Select All' checkbox input element you will 
need and
//                onclick event of 
'toggleCheckboxes(this,document.forms.#formname#.#checkfields#)',
//                and on the checkbox fields (all of the same id/name) 
you will need
//                an onclick event of 
'uncheckSelectAllBox(document.forms.#formname#.#selectallfieldname#,this)
 --->
<script language="javascript" type="text/javascript">
    // Functions for checking and unchecking all checkboxes passed by name
    function toggleCheckboxes(checkItFldObj, fldObj){
        if (checkItFldObj.checked){
            checkAll(fldObj);
        } else {
            uncheckAll(fldObj);
        }
    }
   
    // Function to check all fields
    function checkAll(field){
        if (!field.length){
            field.checked = true;
        } else {
            for (i = 0; i < field.length; i++)
                field[i].checked = true ;
        }
    }
   
    // Function to uncheck all fields
    function uncheckAll(field){
        //alert(field.length);
        if (!field.length){
            field.checked = false;
        } else {
            for (i = 0; i < field.length; i++)
                field[i].checked = false ;
        }
    }
   
    // Function to uncheck the 'Select All' checkbox if an item is unchecked
    function uncheckSelectAllBox(checkItFldObj,fldObj){
        if ((fldObj.checked == false) && (checkItFldObj.checked == true))
            checkItFldObj.checked = false;
    }
</script>

All<br />
<input type="checkbox" name="selectAll" id="selectAll" 
onclick="toggleCheckboxes(this,document.forms.myFormName.chkbxFldName);" />

<!--- Cutter 01.25.06: Add onclick function call to uncheck 'Select All' 
box --->
<input type="checkbox" name="chkbxFldName" id="chkbxFldName" value="" 
onClick="uncheckSelectAllBox(document.forms.myFormName.selectAll,this) />



Michael Borchers wrote:
> i need a little skript to check or uncheck all checkboxes on button click.
>  
> the form name and / or the checkbox name should be parsed dynamically 
> to the function
>  
> function checkAll(formName, checkboxName)
>  
> i tried to modify this function:
> function CheckAll()
> {
>  if(document.form.ALL)
>  {
>   var c = document.form.ALL.checked;
>  }
>  for (var i=0;i<document.form.elements.length;i++)
>  {
>   var e = document.form.elements[i];
>  
>   if(e.name != 'ALL')
>   {
>    if((e.checked!=c) && (e.type=="checkbox"))
>    {
>     e.click();
>      e.checked = c;
>    }
>   }
>  }
> }
> but how can i parse the forms name?
> how about modifying the function without using a form name,
> only using the checkboxes name?
>  
> thanks
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