Question

I´m working with ASP classic, and I already have a button on my page that select
all ch eckboxes, but when I try to make another button, this new “Button2” select all
checkboxes, I need that button1 ckeck the first column and the button2 chek the 2nd.
column.
Thanks in advance.

Here is the HTML for button2 “Todos sin sup”:

<td>
<td align="right" colspan="10"><input type="button"
    name="btn_seleccionar_todo_sin_sup"  value="Todos sin sup" onclick="javascript:marcar
    (this.form);">
</td>   
</td>

The Javascript function:

function marcar()
{
    var aa= document.getElementById('entregas');
    if (checked == false)
    {
        checked = true
    }
    else
    {
        checked = false
    }
    for (var i =0; i < aa.elements.length; i++) 
    {
        aa.elements[i].checked = checked;
    }
}

Answer 1

The problem is that all of the checkboxes are inside of a container with an id called “entregas.”

When your for loop iterates through the element with id="entregas" it stops at aa.elements.length, so you will wrap only the checkboxes you want checked for button 1 in an element with id="entregas" and then wrap only the checkboxes that you want to be checked for button 2 in another element with a different, for example id="entregas2". Then create a new function called, for example marcar2().

Change this line in marcar2():

var aa = document.getElementById('entregas2');

Then use this HTML for button 2:

<input type="button" id="entregas2" value="Button 2" onclick="javascript:marcar2()" />