Question

enable multiple checkboxes

Asked by: dlcnet

Hi all!

I am new to JavaScript and I have a little question. I have several checkboxes in my page. I would like by clicking on the SelectAll one, all the other to be checked.

Thank you!

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Asked On: 2008-01-03 at 04:08:49ID23055277
Tags: jsp, javascript
,; IE 6+
Topics: JavaScript
,; Dynamic HTML (DHTML)
,; WebApplications
Participating Experts: 4
Points: 500
Comments: 17

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Answers

by: pratima_mcsPosted on 2008-01-03 at 04:20:33ID: 20572182

http://www.dustindiaz.com/check-one-check-all-javascript/

by: pratima_mcsPosted on 2008-01-03 at 04:24:13ID: 20572200

http://www.shawnolson.net/a/639/select-all-checkboxes-in-a-form-with-javascript.html

by: pramodcnairPosted on 2008-01-03 at 04:48:05ID: 20572307

Call buttons as so:
<input type=button name="CheckAll" value="Check All"
onClick="checkAll(document.myform.list)">
<input type=button name="UnCheckAll" value="Uncheck All"
//onClick="uncheckAll(document.myform.list)">

//Here is the javascript
<SCRIPT LANGUAGE="JavaScript">
function checkAll(field)
{
for (i = 0; i < field.length; i++)
	field[i].checked = true ;
}
 
function uncheckAll(field)
{
for (i = 0; i < field.length; i++)
	field[i].checked = false ;
}
</script>
 
Here is the HTML:
 
<form name="myform" action="checkboxes.asp" method="post">
<b>Your Favorite Scripts & Languages</b><br>
<input type="checkbox" name="list" value="1">Java<br>
<input type="checkbox" name="list" value="2">Javascript<br>
<input type="checkbox" name="list" value="3">Active Server Pages<br>
<input type="checkbox" name="list" value="4">HTML<br>
<input type="checkbox" name="list" value="5">SQL<br>
 
<input type="button" name="CheckAll" value="Check All"
onClick="checkAll(document.myform.list)">
<input type="button" name="UnCheckAll" value="Uncheck All"
onClick="uncheckAll(document.myform.list)">
<br>
</form>

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Select all Open in new window

by: mplungjanPosted on 2008-01-03 at 04:49:28ID: 20572323

Since those two links are not too easy to follow, here is a complete example - it assumes the form is the first form on the page when it tests at load time to see if it perhaps is returning from another page

<html>
  <head>
  <title>Check all checkboxes</title>
  <script>
  function checkAll(chk) {
    var theForm = chk.form;
    var chkd = chk.checked;
    for (var i=0, n=theForm.elements.length;i<n;i++) {
      if (theForm.elements[i].type=="checkbox") {
        theForm.elements[i].checked=chkd;
      }
    }
  }
  </script>
  </head>
  <body onLoad="checkAll(document.forms[0].allCheck)">
<form>
<input type="checkbox" name="allCheck" onClick="checkAll(this)"/>All<br />
<input type="checkbox"  />A<br />
<input type="checkbox"  />B<br />
<input type="checkbox"  />C<br />
</form>
  </body>
</html>

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Select all Open in new window

by: mplungjanPosted on 2008-01-03 at 04:52:01ID: 20572336

@pramodcnair - I wrote my example while you posted. I do have some comments though:
1. your script needs a collection of checkboxes with the same name.
2. why pass the form by name? All form elements have a .form object

by: dlcnetPosted on 2008-01-03 at 05:07:22ID: 20572435

Thanks all!

I increased the number of points since I got a really good positive feedback. The problem which arises now is the following: The "master" select all checkbox relates to 3 "slave" ones in the first place.
But later on in the same form are 2 more checkboxes which are related to enable/disable a textfield. If I implement the above code all the checkboxes will be checked when the "master" one is selected. How can I fix this?

Thanks again!

by: mplungjanPosted on 2008-01-03 at 05:20:48ID: 20572522

Try this - using name and prefix. Let me know if I need to give you another way

<html>
  <head>
  <title>Check all checkboxes</title>
  <script>
  function checkAll(chk) {
    var theForm = chk.form;
    var chkd = chk.checked;
    var prefix = chk.name;
    for (var i=0, n=theForm.elements.length;i<n;i++) {
      if (theForm.elements[i].type=="checkbox" && 
          theForm.elements[i].name.indexOf(prefix)==0 ) {
        theForm.elements[i].checked=chkd;
      }
    }
  }
  </script>
  </head>
  <body onLoad="checkAll(document.forms[0].zzz)">
<form>
<input type="checkbox" name="zzz" onClick="checkAll(this)"/>All<br />
<input type="checkbox" name="zzz_1" />A<br />
<input type="checkbox" name="zzz_2" />B<br />
<input type="checkbox" name="zzz_3" />C<br />
<hr>
But not these<br />
<input type="checkbox"  />D<br />
<input type="checkbox"  />E<br />
 
</form>
  </body>
</html>

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Select all Open in new window

by: pramodcnairPosted on 2008-01-03 at 05:20:48ID: 20572523

In that case you can use my code. since it will select only the checkbox only inside a form and rest of the check boxes will be ignored.

by: mplungjanPosted on 2008-01-03 at 05:22:02ID: 20572531

For example className:

<html>
  <head>
  <title>Check all checkboxes</title>
  <script>
  function checkAll(chk) {
    var theForm = chk.form;
    var chkd = chk.checked;
    var prefix = chk.name;
    for (var i=0, n=theForm.elements.length;i<n;i++) {
      if (theForm.elements[i].type=="checkbox" && 
          theForm.elements[i].className.indexOf(prefix)==0 ) {
        theForm.elements[i].checked=chkd;
      }
    }
  }
  </script>
  </head>
  <body onLoad="checkAll(document.forms[0].zzz)">
<form>
<input type="checkbox" name="zzz" onClick="checkAll(this)"/>All<br />
<input type="checkbox" class="zzz" />A<br />
<input type="checkbox" class="zzz" />B<br />
<input type="checkbox" class="zzz" />C<br />
<hr>
But not these<br />
<input type="checkbox"  />D<br />
<input type="checkbox"  />E<br />
 
</form>
  </body>
</html>

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Select all Open in new window

by: VincentPugliaPosted on 2008-01-03 at 05:26:39ID: 20572555

Hi,
Here's a little script I wrote a while back that enables you to either select all or "all but" (inverse)

http://www.grassblade.net/scripts/chkAllBut.html

by: mplungjanPosted on 2008-01-03 at 05:46:31ID: 20572692

@pramodcnair - no, your script will only select checkboxes which are called the same...

My scripts also works only inside one form

@VincentPuglia - my script will check or uncheck depending on the state of the check-all checkbox

by: dlcnetPosted on 2008-01-03 at 06:44:47ID: 20573141

Hi all!

Thanks again for the support! I am in the progress to implemt the scripts, so I will decide today the points. As one can see the points are dubled :)

by: dlcnetPosted on 2008-01-04 at 00:14:57ID: 20580551

@mplungian

Hi back!

I implemented the script and it works in normal pages. The problem is that when I implement it in a .jspx site taking instead of the name, the property and updated the script as follows it does not want to react anymore. Any ideea why?

    function checkAll(chk) {
            var theForm = chk.form;
            var chkd = chk.checked;
            var prefix = chk.property;
 
            for (var i=0;i<theForm.elements.length;i++){
                if (theForm.elements[i].type=="checkbox" && theForm.elements[i].property.indexOf(prefix)==0) {
                    theForm.elements[i].checked=chkd;
                }
            }
        }

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Select all Open in new window

by: mplungjanPosted on 2008-01-04 at 00:25:17ID: 20580574

so you added

<input type="checkbox" property="bla" ???

that is not standard html

If so, you need

.
.
var prefix = chk.getAttribute('property');
for (var i=0;i<theForm.elements.length;i++){
  var elem = theForm.elements[i];
  if (elem.type=="checkbox") {
    var prop = elem.getAttribute('property');
    if (prop && prop.indexOf(prefix)==0) {
      elem.checked=chkd;
    }
  }
}

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by: dlcnetPosted on 2008-01-04 at 00:33:05ID: 20580598

@mplungian

I actually define them like this(see bellow). I am using Struts and I think I need to get a StyleId out of it since I belive the property here is not the same as one in the JavaScript :)

<html:checkbox property="xxxActivateAll" style="border:none;" onclick="checkAll(this);" />

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Select all Open in new window

by: mplungjanPosted on 2008-01-04 at 00:34:03ID: 20580600

Alternatively do this if your checkboxes have different names:

var checkSet = "chk1,bla234,x25".split(","); // names of checkboxes
function checkAll(chk,nameArray) {
var theForm = chk.form;
var chkd = chk.checked;
for (var i=0;i<nameArray.length;i++){
var elem = theForm.elements[nameArray[i]];
elem.checked=chkd;
}
}

and call it

<input type="checkbox" onClick="checkAll(this,checkSet)">All
<input type="checkbox" name="chk1">chk1<br>
<input type="checkbox" name="bla234">bla234<br>
.
.

You can use ID too:

var checkSet = "chk1,bla234,x25".split(","); // IDs of checkboxes
function checkAll(chk,nameArray) {
var theForm = chk.form;
var chkd = chk.checked;
for (var i=0;i<nameArray.length;i++){
var elem = document.getElementById(nameArray[i]);
elem.checked=chkd;
}
}

and call it

<input type="checkbox" onClick="checkAll(this,checkSet)">All
<input type="checkbox" id="chk1" name="checkbox1>chk1<br>
<input type="checkbox" id="bla234" name="checkbox2">bla234<br>
.
.

by: mplungjanPosted on 2008-01-04 at 00:40:03ID: 20580623

styleId:
Identifier to be assigned to this HTML element (renders an "id" attribute). [RT Expr]

property:
Name of the request parameter that will be included with this submission, set to the specified value. WARNING - If you set this attribute to a value other than the default, this will NOT be recognized as the cancel key by the Struts controller servlet or the Action.isCancelled() method. You will need to do your own cancel detection. [RT Expr]

sounds like you should use the ID

20120131-EE-VQP-002

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enable multiple checkboxes

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jsp, javascript

IE 6+

JavaScript

Dynamic HTML (DHTML)

WebApplications

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