Alert: Modal Message Box
JavaScript FAQ |
JavaScript Dialogs FAQ
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Question: How do I display an alert message from JavaScript?
Answer: To display an alert message (a simple modal message box), use the alert() method:
window.alert('Message goes here')
The button above was created using the following code:
<form name=myform>
<input type=button value="Try it now"
onClick="alert('Hello from JavaScript!')">
</form>
Note that alert() is a method of the window object.
Thus, all of the following JavaScript statements produce similar results:
alert('message')
window.alert('message') // reference to current window
self.alert('message') // reference to current window
top.alert('message') // top-level frameset
parent.alert('message') // parent frame in a frameset
Returned value. The alert() method does not return a value (that is, it returns undefined).
See also other JavaScript dialogs: