Question

I have a problem with this simple Javascript code:

function select_checkbox(i)
{
    switch(i)
    {
        case 3: 
        if (document.upload_form.3.checked=true)
        {   
            document.upload_form.4.checked=true; 
            document.upload_form.4.disabled=true; 
            document.upload_form.5.checked=true; 
            document.upload_form.5.disabled=true;
        }

        if (document.upload_form.3.checked=false)
        {   
            document.upload_form.4.checked=false; 
            document.upload_form.4.disabled=false; 
            document.upload_form.5.checked=false; 
            document.upload_form.5.disabled=false;
        }  

        break;

        [other code]

associated with this HTML code:

     <input type="checkbox" name="3" onclick="select_checkbox(3)" />
     <input type="checkbox" name="4" onclick="select_checkbox(4)" /> 
     <input type="checkbox" name="5" onclick="select_checkbox(5)" />

I would like to do this:

• if I select the checkbox “3”, check and disable 4 and 5
• if I select the checkbox “4”, check and disable 3 + uncheck and disable 5
• if I select the checkbox “5”, uncheck and disable 3 and 4
• when unselected re-enable and uncheck all

The first part of the code (I report only the part of the checkbox “3”) works good but I have a problem with restore the configuration by un-check the checkbox.

Answer 1

if (document.upload_form.3.checked=true)
{ 
}

should be replaced by

if (document.upload_form.3.checked==true)
{
}

that should be ==