Activate automatic postback using JavaScript

Access to the <body> tag is restricted as it is in masterpage. To automatically trigger a postback when the page loads, you can use the following script:

<script type="text/javascript">
       window.onscroll=  __doPostBack("<%= button.ClientID %>", "");
</script>

Where should this code be placed? Placing it just before the </asp:Content> tag results in a 'Not implemented JS' error.

Any suggestions on how to implement this successfully?

Note: The reason for triggering the postback is to populate an updatepanel when the page loads.

javascriptasp.netajax

Answer №1

Feel free to insert the following code snippet into your project:

<% if (!Page.IsPostBack) { %>
<script type="text/javascript">
window.onload = function() {
   __doPostBack("<%= button.ClientID %>", "");
}
</script>
<% } %>

If you are using C#, keep in mind that the syntax might vary slightly if you are working with VB.NET.

Update: Instead of utilizing <% and %>, consider placing this within the Page_Load method of your page:

if (!Page.IsPostBack) {
   this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "auto_postback", "window.onload = function() { __doPostBack(\"" +  button.ClientID + "\", \"\"); }; ", true);
}

Update II: For a more reliable approach, try implementing the following JS code:

"window.onload = function() { var buttonID = '" +  button.ClientID + "'; alert('ID: ' + buttonID + ', clicking...'); document.getElementById(buttonID).click(); }; "

This should display the client ID of the button and automatically trigger a click event. If issues persist, confirm the ID is correct and exists in the document, and we will assist in troubleshooting any problems.

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