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Dropdownlist - VB2005

Posted on 2006-07-22
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Last Modified: 2008-03-10
How can I do this. When I select an item on Dropdownlist, I want it to display the item on a textbox. Does it has to postback all the time. I'm using Dropdowlist Task and selected Datasource for SQL database.

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click


        Me.TextBox1.Text = Me.DropDownList1.SelectedItem.Text


    End Sub
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Question by:VBdotnet2005
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jonorossi earned 125 total points
ID: 17160792
You can use some JavaScript to set the value of the text box with the onchange html select event. Or you could use an AJAX framework like Microsoft Atlas (atlas.asp.net) if you are going to do more than just setting a basic value (eg. getting data from your database).

Here is some javascript that you can use. Take note that ASP.NET changes the names of your controls so you might like to make use of the ClientID property of your controls instead of hardcoding the IDs.

  <script type="text/javascript">
    function setTextBoxValue() {
      var ddl = document.getElementById("ddlTest");
      document.getElementById("txtTest").value = ddl.options[ddl.selectedIndex].value;
    }
  </script>
 
  <select id="ddlTest" onchange="javascript:setTextBoxValue();">
    <option>hey</option>
    <option>bye</option>
  </select>
 
  <input id="txtTest" type="text" />
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