set a value to a textbox which had focus in javascript

Question

Hai guys, I have three textboxes and one listbox... If the user clicks the first textbox and then click a list item the selected item must be set as value to the textbox... I want this in javascript....

Answer 1

Use the below code for listbox with SelectionMode attribute set to Single.

var istBoxElement = document.getElementById ( "ListBox1" );
var textBoxElement = document.getElementById ( "txtBox1" );    

textBoxElement.value = elem.value;

and write this inside the onfocus event of the textbox element.

Sample Code

<script type="text/javascript">
    window.onload = function() { BindEvents(); }

    function BindEvents ()
    {
        var textBx = document.getElementById ( "txt1" );
        textBx.onfocus = function () {
            SetSel(this);
        }
    }

    function SetSel (elem)
    {
        alert ( elem.id );
        var elem = document.getElementById ( "ListBox1" );
        document.getElementById ( "txt1" ).value =  elem.value;
    }
</script>

<div id="divMain">
    <input type="text" id="txt1" />
    <asp:ListBox ID="ListBox1" runat="server" SelectionMode="Multiple">
        <asp:ListItem>1</asp:ListItem>
        <asp:ListItem>2</asp:ListItem>
        <asp:ListItem>3</asp:ListItem>
    </asp:ListBox>
</div>