How to show a message box in an ASP.NET page?

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青春惊慌失措

As I was a Windows programmer it was so easy to show a message box on a form.

But on an ASP.NET page I don\'t know how can I show it?

Actually I have some co

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猫巷女王i

2020-12-20 01:55

If you REALLY want to have "yes"/"no" buttons (or any buttons that are not your standard OK/Cancel for that matter) you can do the following:

Main page:

<html>
<body>
<script>


function ShowYesNo() {    
    var answer = window.showModalDialog("myModalDialog.htm", '', "dialogWidth:300px; dialogHeight:200px; center:yes");


       document.write('Clicked yes');
    } else {
       document.write('Clicked no');
    }
}

ShowYesNo();

</script>


</body>
</html>

MyModalDialog.htm

<html>
<body>

<p> Do you want to proceed?" </p>
<input type = "button" id = "buttonYes" value = "Yes" onclick = "buttonOnClick('yes')">&nbsp;
<input type = "button" id = "buttonNo" value = "No" onclick = "buttonOnClick('no')">

<script type = "text/javascript">
function buttonOnClick(message) {
    window.returnValue = message;
    window.close();
}
</script> 

</body>
</html>

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北荒

2020-12-20 01:59
The only way to show a Yes No dialog, is to design a custom one (Javascript confirm can only produce OK and Cancel).

Luckily, ASP.NET Ajax controls (Ajaxcontroltoolkit) makes this job easy, as you can have a panel as your messagebox with the buttons you want, and have a ModalPopupExtender to imitate a dialog.

EDIT:

For what you ask with javascript, you can do it (and it is a much simpler solution than any seen so far), but prepared to only have OK and Cancel as the two possible answers. UI Designer Nightmare ! :(

Basically, have the following two properties in your aspx page for that button or whatever:
```
onClientClick = "javascript:confirm('you sure you wanna do this?');" onClick="myButton_Click"
```
onClick will only run if OK is pressed on the msg dialog.
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