Hello world not printing in Textbox after selecting item in dropdownlist

Question

User-1767837043 posted

<asp:DropDownList ID="ddlCharge" runat="server" Width="260px" SkinID="260px" TabIndex="9">
</asp:DropDownList>

<asp:RequiredFieldValidator ID='rfvCharge' runat='server' InitialValue='0' ControlToValidate='ddlCharge' Text="&nbsp" ErrorMessage='*' Display='Dynamic' SetFocusOnError='True' ValidationGroup='vgCharge'></asp:RequiredFieldValidator> <asp:TextBox ID="txtPostFix" runat="server" TabIndex="10"></asp:TextBox>  

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load 
If Not Page.IsPostBack Then Ajax.Utility.RegisterTypeForAjax(GetType(Page_Path))
 ddlCharge.Attributes.Add("onchange", "$('#<%=txtPostFix.ClientID%>').val('hello world')") 
 End If 
End Sub

Answer 1

User475983607 posted

You writing the following to the browser.  Use the browser's dev tools (F12) to view the results.

$('#<%=txtPostFix.ClientID%>').val('hello world') 

Change the string to this.

"$('#" + txtPostFix.ClientID + "').val('hello world')"