how to select and deselect all items in listbox when click checkbox

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I used this code for select all items in listbox when click the checkbox.

in page_load

listbox1.Attributes.Add("onclick", "javascript: selectall();")

in javascript:

JavaScript

function selectall()
     {
     //var sel=document.getElementById('cb_selall');
     for(i=0; i<document.form1.li_mana_cards.options.length; i++)
     {
       document.form1.li_mana_cards.options[i].selected = true;
     }
     }

From the OP:
"I want to deselect all items in listbox when i click checkbox. I dont know how to write code for this process. If u know plz help me."

Posted 17-Apr-11 19:56pm

Jayanthi-SE

Updated 17-Apr-11 22:15pm

OriginalGriff

v6

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Comments

Jayanthi-SE 18-Apr-11 1:57am

If anybody know solution to this pbm plz help me.

OriginalGriff 18-Apr-11 2:00am

And your question is?

Jayanthi-SE 18-Apr-11 3:10am

I used this code for select all items in listbox when click the checkbox.

in page_load
listbox1.Attributes.Add("onclick", "javascript: selectall();")

In source:
function selectall() { //var sel=document.getElementById('cb_selall'); for(i=0; i

OriginalGriff 18-Apr-11 3:20am

And you still have to explain what problem you are getting: edit your question and explain your problem - not what you are doing, what is not working...

Jayanthi-SE 18-Apr-11 4:09am

I want to deselect all items in listbox when i click checkbox. I dont know how to write code for this process. If u know plz help me.

Sunasara Imdadhusen 18-Apr-11 2:01am

Is there any problem?

Jayanthi-SE 18-Apr-11 3:11am

s there is some pbm when i try to deselect all items in listbox while click the checkbox. If u know any solution plz help me.

3 solutions

Solution 2

http://forums.asp.net/t/1138169.aspx/1[^]

I hope the above information will be helpful.

Posted 17-Apr-11 21:32pm

Monjurul Habib

Solution 4

I wrote this coding to select and deselect all items in listbox when click checkbox. Its working well. Thanks to all.

Javascript:

C#

function selectall(cb_selall)
     {

     if (cb_selall.checked)
       {

         for(i=0; i<document.form1.li_mana_cards.options.length; i++)
            {
               document.form1.li_mana_cards.options[i].selected = true;
            }
            }
     else
     {

     for(i=0; i<document.form1.li_mana_cards.options.length; i++)
            {
               document.form1.li_mana_cards.options[i].selected = false;
            }

      }

           }

Page Load:

cb_red_inac.Attributes.Add("onclick", "javascriptselectall(this);")

Posted 18-Apr-11 20:49pm

Jayanthi-SE

Updated 18-Apr-11 21:49pm

v2

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OriginalGriff · Accepted Answer · 2011-04-17T22:16:00

Solution 3

If the code you have given for selecting the items is working, why not change it: Rename it to "deselectall" and replace "true" with "false"...

Posted 17-Apr-11 22:16pm

OriginalGriff