How to click an ASP.NET button from JavaScript?

@dewayne_green 

To click an ASP.NET button from JavaScript, you can use the click method of the button element.

Here's an example of how you can do this:

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<script type="text/javascript">
  function clickButton() {
    var button = document.getElementById("myButton");
    button.click();
  }
</script>

<asp:Button ID="myButton" runat="server" Text="Click me" OnClick="Button_Click" />

<input type="button" value="Click button" onclick="clickButton()" />

In this example, we have an ASP.NET button with an ID of myButton, and a JavaScript function called clickButton that gets a reference to the button element and calls its click method. We also have a regular HTML button that, when clicked, will call the clickButton function, which will in turn click the ASP.NET button.

When the ASP.NET button is clicked, it will fire its OnClick event, which in this case is handled by the Button_Click event handler on the server side.

Note that this approach will only work if the button is a standard HTML button element, and not an input element with a type attribute set to "button".

@dewayne_green 

If you want to click an ASP.NET server-side button from JavaScript, you can use the __doPostBack method. Here's an example:

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<asp:Button ID="myButton" runat="server" Text="Click me" OnClick="Button_Click" />
<input type="button" value="Click button" onclick="clickButton()" />

<script type="text/javascript">
  function clickButton() {
    __doPostBack('<%= myButton.UniqueID %>', '');
  }
</script>

In this example, we have an ASP.NET button with an ID of myButton and a JavaScript function called clickButton. Inside the clickButton function, we call the __doPostBack method. The first parameter of __doPostBack is the unique ID of the ASP.NET button, which is retrieved using the <%= myButton.UniqueID %> expression. The second parameter is just an empty string.

When the JavaScript function is called and __doPostBack is executed, it triggers a postback to the server. On the server side, the Button_Click event handler will be executed.

Note that if you have a button with the UseSubmitBehavior property set to false (the default behavior for ASP.NET buttons), you'll need to manually disable the button after clicking it. Otherwise, the button may be clicked multiple times if the user clicks it again before the postback is complete.