将函数中的对象从html发送到后面的代码

Question

Is it possible to send an element from the html to the code behind on event? like that, for example:

<td id="id1" onClick="do1(id1)" runat="server"></td>

code behind:

protected void do1(object sender, EventArgs e,**var x**)
{
    x. Attributes.Add("class", "class1");
}

Answer 1

No, you can't send an element from the html to the code behind the way you wrote above. However if you want to add a value for an attribute of a server control (html elements that have the runat="server"), you can. Please tell us what's the attribute you want to add and I will include the corresponding piece of code.

Answer 2

If it were javascript then you can use the "this" keyword:

<td id="id1" onClick="do1(this)"></td>

"this" means "id1". You can also write your function like this:

function do1(){
   var x = document.getElementById("id1");
   //do sth with x
}

Answer 3

If all you need to do in the code behind is add a CSS class, why not do it via javascript?

html:

<td id="id1" onClick="changeClass()"></td>

javascript:

<script type="text/javascript">
function changeClass()
{
document.getElementById("id1").className = "class1";
}
</script>

If you need to run your method from the codebehind you will have to post back the page for the code to ever get reached.