onTextChange event not firing against the the text change I made through Java script

Question

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JavaScript
<script type="text/javascript">
document.getElementById("TextBox1").innerText= 'Hi";
</script>

HTML

XML

<form id="form1" runat="server">
  <div>
    <asp:TextBox ID="TextBox1" runat="server" AutoPostBack="True" OnTextChanged="TextBox1_TextChanged"></asp:TextBox>
  </div>
</form>

Code Behind

C#

protected void TextBox1_TextChanged(object sender, EventArgs e)
{
    string Query = string.Format("INSERT INTO GMaps(latLng) VALUES('{0}')", TextBox1.Text);
    SqlConnection cn = new SqlConnection("ConnectionString");
    SqlCommand cmd = new SqlCommand(Query, cn);
    cn.Open();
    cmd.ExecuteNonQuery();
    cn.Close();
}

Posted 24-Mar-15 0:56am

Member 10528646

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Comments

Sajith Dilhan 24-Mar-15 7:14am

You are not calling the javascript from your code. When the textbox is set to AutoPostBack = "True" it will always call the TextBox1_TextChanged event.

Try something like this
<asp:TextBox ID="TextBox1" runat="server" AutoPostBack="True" OnTextChanged="TextBox1_TextChanged" OnClientClick="function1()">

and
<script>
function function1()
{
document.getElementById("TextBox1").innerText= 'Hi";
}
</script>

1 solution

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Sinisa Hajnal · Answer 1 · 2015-03-24T01:39:00

To call javascript you have to add
onblur="your_javascript_function" and if you don't want the postback return false from it.

ASP.NET

<asp:textbox id="TextBox1" runat="server" autopostback="True" ontextchanged="TextBox1_TextChanged" onblur="return your_javascript_function()" xmlns:asp="#unknown">
</asp:textbox>

Also, this line

JavaScript

document.getElementById("TextBox1").innerText= 'Hi";

would not work due TextBox1 id in the html is NOT TextBox1, but something like Page_Ctl01_Ctl02_TextBox1

ASP.NET ensures that all control ids are unique and server mangles the ids you wrote so they are unique by prepending them with parents

You can access the element like this: