How do you get Selected value of combobox using javascript[Answered] RSS

• • Reply
  duckkiller53

  Member

  23 Points

  306 Posts

  How do you get Selected value of combobox using javascript

  Oct 29, 2013 03:08 PM|duckkiller53|LINK

  Could someone help:  I am trying to get the selected value of an ajax control toolkit ComboBox control.  I have the ComboBox databound to a collection of objects.   I would like to determin if the user has selected a value in the ComboBox or if it is still set to the default value of -1.  I have tried the javascript below, but I keep getting this error.

  0x800a138f - JavaScript runtime error: Unable to get property 'undefined' of undefined or null reference

  <asp:ComboBox ID="cboProdSearch" runat="server" width="80px" DropDownStyle="DropDown" AutoCompleteMode="SuggestAppend"
       AutoPostBack="true" BackColor="#FFF6E5" CaseSensitive="false" RenderMode="Inline" ItemInsertLocation="Append">
  </asp:ComboBox>
  
  

   cboProdSearch.DataSource = products;
   cboProdSearch.DataTextField = "ProdID";
   cboProdSearch.DataValueField = "ProdID";
   cboProdSearch.DataBind();
   cboProdSearch.Items.Insert(0, new ListItem("--Select--", "-1"));

  var cboProdSearch = document.getElementById('<%= cboProdSearch.ClientID %>');   
  var selectedvalue = cboProdSearch.options[cboProdSearch.selectedIndex].value;  // fails on this line
  
  if (selectedvalue == "-1" {return false;}  

  Any help would be major appreaciated.
  
  Thanks.
  

  Duckkiller53
  
  Duckkiller53@gmail.com
• • Reply
  Fuxiang Zhan...

  All-Star

  30411 Points

  3628 Posts

  Re: How do you get Selected value of combobox using javascript

  Oct 31, 2013 05:33 AM|Fuxiang Zhang - MSFT|LINK

  Hi duckkiller53,

  Thanks for the post.

  From your description, I see that you want to get the seleted value of ajax control ComboBox.

  Please try below code.

  var combo = $find("<%#ComboBox1.ClientID %>");
    var seletedvalue = combo.get_textBoxControl().value;
    alert(seletedvalue);

  If any doubt, please feel free to back. Thanks.

   

  Best Regards!

  We are trying to better understand customer views on social support experience. Click HERE to participate the survey. Thanks!
  
• • Reply
  duckkiller53

  Member

  23 Points

  306 Posts

  Re: How do you get Selected value of combobox using javascript

  Oct 31, 2013 10:42 AM|duckkiller53|LINK

  Thanks for the help.  I could not find anything on the web to do that!

  Duckkiller53
  
  Duckkiller53@gmail.com