In what manner does ASP.NET trigger events for the client?

Question

In what manner does ASP.NET trigger events for the client?

For instance, say a user clicks a <button>, I understand that the event handler on the server side will be triggered.
But how is the event initiated on the client side? Since the initial page (using GET) consists of pure HTML on the client side, does the event originate from JavaScript?

If so, does this imply that .aspx automatically generates JavaScript code on the client side first?

For example, if there is an ASP button on an .aspx page:

 <asp:Button ID="btnCalculate" runat="server" Text="Calculate" Width="122px" OnClick="btnCalculate_Click" />

The OnClick indicates that this is a JavaScript event, but where can I find the relevant JavaScript code?

javascript c#asp.net .net

Answer 1

Answer №1

<asp:{Control>}> are server-sided controls, and the onclick event you're observing is not a typical representation in HTML.

<asp:Button ID="btnCalculate" runat="server" Text="Calculate" Width="122px" OnClick="btnCalculate_Click" />

This would display something similar to:

<input id="btnCalculate" type="submit" value="Calculate"/>

This triggers a callback on the server, leading to the execution of btnCalculate_Click() defined in the View's ASP.NET and C# code (.aspx.cs):

public void btnCalculate_Click(object sender, EventArgs e){
   ...
}

In contrast, this C# ASPX code translates to the following HTML equivalent:

<button id="btnCalculate" onClick="btnCalculate_Click()"/>

This instructs the client (browser engine) to look for a relevant JavaScript function (e.g., in your site.js or other provided JavaScript resource):

function btnCalculate_Click(){
    alert("This is client-side scripting");
}

Answer 2

<asp:{Control>}> are server-sided controls, and the onclick event you're observing is not a typical representation in HTML.

<asp:Button ID="btnCalculate" runat="server" Text="Calculate" Width="122px" OnClick="btnCalculate_Click" />

This would display something similar to:

<input id="btnCalculate" type="submit" value="Calculate"/>

This triggers a callback on the server, leading to the execution of btnCalculate_Click() defined in the View's ASP.NET and C# code (.aspx.cs):

public void btnCalculate_Click(object sender, EventArgs e){
   ...
}

In contrast, this C# ASPX code translates to the following HTML equivalent:

<button id="btnCalculate" onClick="btnCalculate_Click()"/>

This instructs the client (browser engine) to look for a relevant JavaScript function (e.g., in your site.js or other provided JavaScript resource):

function btnCalculate_Click(){
    alert("This is client-side scripting");
}

Answer 3

Answer №2

It is essential to reassess the concept of the Client-Server-Paradigm.

In this paradigm, a client initiates a request that is subsequently accepted by the server.
The server then generates and sends back an "answer" (response) to the client for it to receive.

Answer 4

It is essential to reassess the concept of the Client-Server-Paradigm.

In this paradigm, a client initiates a request that is subsequently accepted by the server.
The server then generates and sends back an "answer" (response) to the client for it to receive.

In what manner does ASP.NET trigger events for the client?

Answer №1

Answer №2

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