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Trigger c# Event from JavaScript Function

I'm trying to call c# event from javascript function. I tried this:
<script type="text/javascript">
function LikeClick() {
document.getElementById('<%=Helper.ClientID %>').click();
}
</script>
<asp:Button ID="Helper" runat="server" OnClick="Helper_Click" />
But it doesn't trigger the c# event.

I believe a <asp:Button> will natively post the form back without a client side event handler. You need a control that does not natively post back but instead uses a client side click handler to call the __doPostBack() function.
Change
<asp:Button ID="Helper" runat="server" OnClick="Helper_Click" />
to this
<asp:LinkButton ID="Helper" runat="server" OnClick="Helper_Click" />

C# .NET OnClientClick returning true but OnClick not firing

I have the following code:
<asp:Button ID="btnHideDep" runat="server" Text="Remove this institution" CssClass="link1 small" OnClientClick="return confirm('Confirm remove?');" OnClick="btnHideDep_Click"/>
This button does not fire btnHideDep_Click when OK is pressed in the confirm box.
More interestingly, if i have OnClientClick=return true; the method btnHideDep_Click is still not fired. Also just to confirm, without the property OnClientclick, btnHideDep_Click is fired properly.
I read a few posts about this and it seems like this should work. So I must be missing something very basic here...

Try
OnClientClick="if (!confirm('Confirm remove?')) return false;"

Calling c# from JS via button

So what I want to do is click on a button which will cause JS code to run which will cause another button to click and button #2 will be runat="server" and cause a C# function to run onClick.
But using the below does not cause the C# function to run even though simply clicking the button2 does cause it to run.
function button1_click() {
document.getElementById('button2').click();
__doPostBack('#button2', 'onclick');
$('#button2').trigger('click');
// neither worked (tried them seperately)
}
<asp:Button runat="server" Visible="true" text="you should not see this" ClientIDMode="Static" ID="button2" onclick="button2_Click" formnovalidate />
Useful knowledge:
- button one is in a client form
- button two is in a runat="server" form

This code
$('#button2').trigger('click');
should work.
Have you checked that the ID 'button2' is not changed during runtime?
Sometimes, when using master pages or user controls, the client ID of an element with runat="server" attribute will get a prefix at run time.
Use a debug console (depends on your browser, try pressing F12) to check the effective client ID.
Also, have you checked that button1_click() function is actually called?

ASP.Net Ajax Control Toolkit "UpdatePanelAnimationExtender" breaking jQuery focus() onload

I have the following update panel with a text field limited to 9 characters only accepting numbers.
<asp:UpdatePanel ID="updatePanelsearchusers" runat="server" UpdateMode="Always">
<ContentTemplate>
<div class="formfieldarea">
<div id="searchfield1" class="searchfieldbox">
<asp:Label ID="USIDSearchlbl" runat="server" Text="USID: " CssClass="formlabel" />
<asp:TextBox ID="USIDSearchBox" runat="server" MaxLength="9" />
<cc1:FilteredTextBoxExtender ID="FilteredTextBoxExtender1" runat="server" TargetControlID="USIDSearchBox" ValidChars="0123456789" />
<asp:ImageButton ID="USIDsearchbutton" runat="server" ImageUrl="/tissuebank/images/searchButton.png" CausesValidation="true" OnClick="search1_Click" CssClass="searchbutton" />
</div>
</div>
<div>{output from search}</div>
</ContentTemplate>
</asp:UpdatePanel>
And the following JavaScript which will automatically trigger the search button if the number of characters reaches 9.
<script type="text/javascript" language="javascript">
function setupUSIDFocus() {
$('#<%=USIDSearchBox.ClientID %>').focus().keyup(function () {
if ($(this).val().length == 9) {
$('.searchbutton').first().click();
}
});
}
$(document).ready(function () { setupUSIDFocus(); });
</script>
If I have the code as above this works fine and loads with the focus being on the element USIDSearchBox as I intended, however when the update panel is updated but the event is no longer assigned to the box and the focus is lost. To fix this I added an ASP.Net Ajax control UpdatePanelAnimationExtender so that the focus and events are reassigned when the request is complete.
<AjaxControlToolkit:UpdatePanelAnimationExtender ID="upae" runat="server" TargetControlID="updatePanelsearchusers">
<Animations>
<OnUpdated>
<Sequence>
<Parallel duration="0">
<ScriptAction Script="setupUSIDFocus();" />
</Parallel>
</Sequence>
</OnUpdated>
</Animations>
</AjaxControlToolkit:UpdatePanelAnimationExtender>
And indeed this does reset the focus and the keyup event but for some reason the element does not get focus when the page is first loaded. Though the keyup event is still attached onload I am just missing the focus being on the USIDSearchBox field. If I remove the UpdatePanelAnimationExtender then I get the focus back on load, so it must be something to do with this control.
Does anyone have any idea how to get the focus onload of the page?

Alternatively, you can use 'ScriptManager.RegisterStartupScript' in 'search1_Click' to call the jQuery function after ajax update:
ScriptManager.RegisterStartupScript(this,this.GetType(),"myscript","setupUSIDFocus();",true);

asp button and history back onclientclick

hi I have an asp button which is created using the following code:
<asp:Button ID="btnBack" OnClientClick='javascript:history.back()' runat="server" Text="back">
</asp:Button>
However, now the javascript doesn't work to go a history back. On the other hand, if I make an alert() it works...why. Why is it not working to go a history back?

Try with return false at end:
<asp:button id="btnBack" runat="server" text="Back"
OnClientClick="JavaScript: window.history.back(1); return false;"></asp:button>

Try:
parent.history.back();
Or
history.go(-1)

Had the same problem in DevExpress project. Using ASPxButton without initializing the property "AutoPostBack" will result in redirect to self page before any client-side function call.
Try AutoPostBack="false" for the button.