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HTML tag:label with onclick asp.net method.

I have this form:
<form id="form21" runat="server" method="post" onsubmit="return send()">
<asp:Button runat="server" ID="submit" name="submit" type="submit" class="btn btn-send" Text="עדכן" onclick="submit_Click" />
<label ID="other" name="other" runat="server" class="btn btn-send" onclick="other_Click" Visible="False">נהל משתמש אחר</label>
</form>
When I click on the label this error occur: "JavaScript runtime error: 'other_Click' is undefined".
How can I combine between asp.net method and HTML tag?

From server perspective, this:
<label ID="other" name="other" runat="server" ...
is an instance of HtmlGenericControl class. This class and most of its subclasses does not have server-side click event. So the onclick you defined is not treated as server-side subscription and therefore rendered into the HTML as is. So on the final page is this just a JavaScript function call. And since you do not have such function on the client side, you get the error.
To resolve it you might want to switch to some sever-side control which has serve-side Click event. For example LinkButton, though it will require some css to look like label. Other option is to generate postback yourself on the client, but this is a bit unusual path.

you should define what do you want to do, the click is for show or execute one task or do you want execute to the server side..
For execute one task with the click and not call to the server, you should define the function javascript and call
For execute call to the server with the event click , you should use wcf ajax for call the server..
or maybe this can help you
http://www.morgantechspace.com/2014/01/Call-Server-Side-function-from-JavaScript-in-ASP-NET.html

Finding element in aspx by property (not Id)

I have a that would result in some uncompilable code in the designer.cs file:
<div id="tabs-1-2-3"></div>
If I add a runat="server" property, my designer file won't compile for obvious reasons.
Is there any way to add an extra property that wil be used internally as the id?

If you don't have runat="server" then you can access it through the old school way.
<input type="text" id="text1" name="text1" />
then from server side use
Request["text1"]
for div:
The best way to do this would be some form of ajax, since your client side script would be able to read that contents and pass it to a server side method
Access in code behind isn't possiable without runat="server" attributes

Use an <asp:Panel /> which will turn into a <div> in the HTML page.

Can I add HTML button triggers to update panel

Is it possible to add HTML input buttons to asp.net triggers, as I have a message box it works perfectly for a gridview which is in update panel,
but when I go to a different page of gridview, message box displays but buttons stops working, I don't know how to debug it, please help.
this is the button,
<input type="button" id="Button2" value="Cancel" cssclass="rightButton" />
and can I add it to,
<asp:AsyncPostBackTrigger ControlID="Button2" EventName="Click" />
OR should I not ?

with runat server tag you use html controls in c# script.
i.e
<input type="button" id="Button2" value="Cancel" cssclass="rightButton" />
should be
<input type="button" id="Button2" value="Cancel" cssclass="rightButton" runat="server" />
and the when you double click on it(assuming VS as IDE), it will make a new click event in c# snippet. Besides its good practice to use direct html tags when complex functions are not needed, it saves time to display the page, as an asp component first translates itself in the html and then goes to browser; while this approach saves time of translation.
Regards

Yes you can! to see errors ,first remove UpdatePanel from your code and then test elements without it,in this status if any error occurs will be shown, after test you can add it again.

Form GET in ASP.NET

I'm trying to convert a classic ASP page to ASP.NET 3.5.
On the page, there is a small form to submit your e-mail address to an external newsletter site. Here's the code:
<form name="emailForm" action="http://www.site.com/emailsignup.aspx" method="get">
<input type="text" name="email" />
<input type="submit" id="btnSubmit" name="btnSubmit" />
</form>
I was hoping I'd just be able to drop this on the page and it would work, but it doesn't, it just reloads the page.
How am I supposed to do this? Does it need to be done in the code behind of the button's click event?

In ASP.Net, by default controls - like the button - that cause postbacks will submit the page back to itself EVEN if you set the action attribute on the page to another file. What you want is called Cross-Page Posting. The following MSDN pages shows you how to do this with ASP.Net 4, but there is a link at the top to get to older versions:
http://msdn.microsoft.com/en-us/library/ms178140.aspx
http://msdn.microsoft.com/en-us/library/ms178139.aspx
Otherwise you can just use the Button's Click Event Handler in the code behind.
Hope this helps.

you must be missing runat="server" in the form tag
try to create a page through the IDE and paste the code for input tags between the form tags
<input type="text" name="email" />
<input type="submit" id="btnSubmit" name="btnSubmit" />

It surely is ending nested in the form aspx get by default.
Depending on the layout of your page, you can modify it so you don't end with a nested form. If that's not possible, I think you can't get around to use a form, so instead you'll have to look at a different solution like building the get with js.

The easiest way would be to put that <form> tag outside the main <form runat="server"> tag that usually wraps all ASP.NET controls.
If you're using a master page and the only content placeholder you can use is within that <form runat="server" tag, or you need this form tag in the page structure within the main <form runat="server"> tag then you need to:
Take out the simple <form> tag but leave the HTML <input> tags. Handle the client onclick event (the JavaScript versions, not ASP.NET postback handlers) of the submit button. That handler should grab the e-mail from the text box and issue something like window.location = 'http://www.site.com/emailsignup.aspx?email=....' in Javascript. Make sure to cancel the default HTML button action handler so it doesn't bubble up and submit the ASP.NET form too.

I need a hidden field in an .NET Repeater control.

The catch is this is a .NET 1.0 project and there is no hidden field control...
So this is out of the question:
<asp HiddenField Runat="server" ID="hdn" />
I vaguely remember some type of HtmlHiddenInput class that allowed similar functionality...does anybody know how to do this?
Thanks.

You can use a regular input or create a custom server control.
<input type="hidden" runat="server" />

You can use <input type="hidden" Name="HiddenControl" runat="server" />
and at code behind page use below code:
protected System.Web.UI.HtmlControls.HtmlInputHidden HiddenControl;
You can assign value to hidden control:
HiddenControl.value="Your value";

just use an asp textbox and the visible=false property