Check all checkboxes on clicking bottom checkbox

129 New Member

Hi friends,
I have a doubt about checkboxes, i.e if i am creating checkboxes with the same name, in a loop and i have another checkbox down to the above checkboxes, My problem is that if i select the down checkbox as a result the above checkboxes all to be checked(visible). Is it possible with the javascript.
Please help me my friends.

Dec 21 '07 #1

Subscribe Reply

2375

gits

5,390

Recognized Expert Moderator Expert

hi ...

please post the code you have so far ... so that we might have an example to work with ...

kind regards

Dec 21 '07 #2

acoder

16,027

Recognized Expert Moderator MVP

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Dec 22 '07 #3

sasimca007

129

New Member

Expand|Select|Wrap|Line Numbers

 my $j = 1;

        while(($u,$cha,$a) = $sth2->fetchrow_array())

        {

print <<HTML;

        <tr style="color: blue"><td align="right"><input type="checkbox" name="$a" /></td><td align="center"><b>$j.</b></td><td align="center"><b>$cha</b></td><td></td><td align="center"><b>$a</b></td><td align="center">

HTML

        if($u eq $user_name)

        {

print <<HTML;

        <input name = '$a' type="button" value="EDIT" onclick='disp(this.form,this.name)'>

        </td><td align="center"><input name = '$a' type="button" value="DELETE" onclick='del(this.form,this.name)'></td></tr>

HTML

        }

        else

        {

print <<HTML;

        <input name = '$a' type="button" value="EDIT" onclick='display(this.form,this.name)'>

        </td><td align="center"><input name = '$a' type="button" value="DELETE" onclick='ddisplay(this.form,this.name)'></td></tr>

HTML

        }

            $j++;

        }

print <<HTML;

    </table>

    </center>

    <br>

    <center>

    <table colspan=3 width="20%">

        <tr>

            <td align="center"><input type="checkbox" name="acheck"></td><td align="center"><input type="button" value="Add a New Comment" onclick='addevent(this.form)'></td><td align="center"><input type="button" onclick='next(this.form)' value="Authorize comments"></td>

        </tr>

        <tr><td></td></tr><tr><td></td></tr><tr><td></td></tr><tr><td></td></tr>

    </table>

Dec 22 '07 #4

gits

5,390

Recognized Expert Moderator Expert

hi ...

have a look at the following example:

[HTML]<html>
<html>
<script type="text/javascript">
function check_all(abox) {
var table = document.getElementById('my_table');
var cboxes = table.getElementsByTagName('input');
var l = cboxes.length;

for (var i = 0; i < l; i++) {
var n = cboxes[i];
n.checked = abox.checked;
}
}
</script>
<body>
<table id="my_table">
<tr><td><input type="checkbox" name="cbox"/></td></tr>
<tr><td><input type="checkbox" name="cbox"/></td></tr>
<tr><td><input type="checkbox" name="cbox"/></td></tr>
</table>
check all
<input type="checkbox" name="chk_cbox" onclick="check_all(this);"/>
</body>
</html>[/HTML]
kind regards

Dec 22 '07 #5

acoder

16,027

Recognized Expert Moderator MVP

So, the one named "acheck" should check all the rest.

Add an onclick="checkAll(this.checked)". Now, in the checkAll function, you need to get all the checkboxes. You can get this using document.getElementsByTagName("input"). Then , you will need to check for the type that it's a checkbox. Set the checked property of each to the checked property of the main checkbox.

Edit: gits beat me to it with an example!

Dec 22 '07 #6

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