How to update web form user control using javascript setinterval

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Hi,
I need to call button click event code behind function at every 5 seconds. the button click should be automatically fired using java script SetInterval. but at runtime i had error "object reference not set". please help me. and one more thing it should be possible on user control.thanks in advance.

What I have tried:

<asp:button ID="updateButton" runat="server" Text="" OnClick="updateButton_Click" Style="display:none"/>

java script:
setInterval(function () {
$("#updateButton").click();
}, 5000);

and code behind

protected void updateButton_Click(object sender, EventArgs e)
{
name.innerText="some dynamic value";
}

Posted 26-Jul-16 0:13am

Member 11125335

Updated 26-Jul-16 1:28am

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Comments

F-ES Sitecore 26-Jul-16 6:47am

What line gives the error?

Member 11125335 26-Jul-16 6:50am

setInterval(function () {
$("#updateButton").click();
}, 5000);

while entering the click event "object reference null" error occured

1 solution

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Vincent Maverick Durano · Accepted Answer · 2016-07-26T01:28:00

Solution 1

When working with WebForm's server controls at the client, It's always recommended to use the control's ClientID when referencing them. So try something like this:

JavaScript

setInterval(function () {
   $("#<%= updateButton.ClientID %>").click();
}, 5000);

Or this:

JavaScript

setInterval(function () {
  __doPostBack('<%=updateButton.ClientID%>','');
}, 5000);

Posted 26-Jul-16 1:28am

Vincent Maverick Durano

Updated 26-Jul-16 1:29am

v2

Comments

Member 11125335 26-Jul-16 9:18am

Thank you very much. its working.

Vincent Maverick Durano 26-Jul-16 9:29am

Glad to be of help :)