Guide on triggering a C# method following a JavaScript function

After updating the Input Text field in a web forms application using a JavaScript method, the change method in the C# code does not seem to work. How can I resolve this issue?

<asp:TextBox ID="Value1" Columns="2" MaxLength="3" Text="1" runat="server" OnTextChanged="Value1_TextChanged"/>
    
    <button onclick="changeText()">sample</button>
    <script>
    function changeText(){
       $("input[id$='Value1']").val("Change Value!");
    }
    
    </script>
``

On the cs file of this page:

protected void Value1_TextChanged(object sender, EventArgs e)
            {
                string test="this works";
            }

What is the interaction between the Value1_TextChanged method in C# and the changeText method in JavaScript?

javascriptc#asp.netwebforms

Answer №1

It's probably easiest to handle text box changes like this:

        Js change text box<br />
        <asp:TextBox ID="TextBox7" runat="server" Width="262px"
            onchange="mytextboxchange(this)"
            ></asp:TextBox>

        <asp:Button ID="cmdText7" runat="server" Text="Button" ClientIDMode="Static"
            OnClick="cmdText7_Click" style="display:none"
            />
        <script>

            function mytextboxchange(btn) {

                console.log("client side text 7 runs")
                $('#cmdText7').click()

            }

Then in the code behind:

    protected void cmdText7_Click(object sender, EventArgs e)
    {
        Debug.Print("Server side text 7 changed");
    }

You could also try using __doPostBack("Mytext7","")

However, if there are no controls on the page requiring a post-back, the _doPostBack() stub won't be automatically added, making things messy.

So, simply add a hidden button, attach a button click event, then hide it with display none. This should be sufficient since text changed events aren't that common.

Answer №2

When altering the value of an input through code, the change event is not automatically triggered. To ensure that the updated value is sent back to the server-side event, you must manually trigger the change event. Modify your changeText function to include the following:

function changeText(){
   $("input[id$='Value1']").val("New Value!");
   // manually trigger the change event
   $("input[id$='Value1']").trigger("change");
}

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