CODEWITHSUNDEEP
asp.netjavascriptvb.net
Eric
Eric

Reputation: 8088

Get a listbox's selected items in javascript

I have two listboxes in asp.net. On the click of a button I want to load a list box with the elements of the selected items in the other box. The problem is that this has to be done on the client side because when the button is clicked I don't allow it to submit. I want to call a javascript function onselectedindexchange but that is server side. any ideas? Should i be more clear?

Solution

enter code here
function Updatelist() {
    var sel = document.getElementById('<%=ListBox1.ClientID%>')
    var lst2 = document.getElementById('<%=ListBox2.ClientId %>')
    var listLength = sel.options.length;
    var list2length = lst2.options.length;
    for (var i = 0; i < listLength; i++) {
        if (sel.options[i].selected) {
            //lst2.options.add(sel.options[i].text);
            lst2.options[list2length] = new Option(sel.options[i].text);
            list2length++;
        }
    }
}

Upvotes: 3

Views: 57792

Answers (4)

AkshyaDash
AkshyaDash

Reputation: 11

more precisely we can do it like;

function selectedVal(list) {   
    alert(list.options[list.selectedIndex].text);                  
} 

<select id="listbox" multiple="multiple" 
        style="height: 300px; width: 200px;" 
        onclick="javascript:selectedVal(this);">  
</select>

Upvotes: 1

TStamper
TStamper

Reputation: 30374

Try:

 //onclick for button calls this function
 function Updatelist() {
 var sel = document.getElementbyId("list1");
 var listLength = sel.options.length;
 for(var i=0;i<listLength;i++){
    if(sel.options[i].selected)
    document.getElementById("list2").add(new Option(sel.options[i].value));
  }

Upvotes: 8

Eric
Eric

Reputation: 8088

function Updatelist() {
var sel = document.getElementById('<%=ListBox1.ClientID%>')
var lst2 = document.getElementById('<%=ListBox2.ClientId %>')
var listLength = sel.options.length;
var list2length = lst2.options.length;
for (var i = 0; i < listLength; i++) {
    if (sel.options[i].selected) {
        //lst2.options.add(sel.options[i].text);
        lst2.options[list2length] = new Option(sel.options[i].text);
        list2length++;
    }
}

}

Upvotes: 0

Rigobert Song
Rigobert Song

Reputation: 2794

Here is a good article on how to do this using Jquery.

You could also stick your drop downs in an Update Panel.

Upvotes: 0

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