How Do I Pop up an Alert in Javascript?

Question

How do I pop up an alert in JavaScript?

I tried alert"HELLO" but that didn't work.

Can someone tell me the correct syntax?

Answer 1

You need to add parentheses:

alert("HELLO");

Answer 2

Unlike VBScript, JavaScript requires parentheses around function calls.

Therefore, you need to write alert("Hello!");

It's also preferable (but not required) to end every statement with a semicolon ;.

Finally, if you aren't already, you need to put it in a script block, like this:

<script type="text/javascript">
    alert("Hello!");
</script>

You can put JavaScript inside a script tag in an HTML page, or you can make a standalone .js file and double-click on it (in Windows) to run it using WSH.

Answer 3

<script type="text/javascript" >
  alert("hello");
</script>

Answer 4

if you're having problems with alerts, it probably means your javascript is disabled in your browser, but if it isn't these methods should solve your issue.

<script type="text/javascript" >
    window.alert("Hello World!");

    alert("Hello World!");
</script>

Answer 5

Just add parantheses

alert("Hello");

Answer 6

<script type="text/javascript">alert("Hello");</script>

Answer 7

There are a few ways.

Use your web browser, type this code in address bar.

javascript:alert("Hello World!")
Open web developer in your web browser, go to console and type:

alert("Hello World!")
Type the code in .html or .js code as shown in other answers above.

Answer 8

<html>
<head>
<script type="text/javascript">
  function myFunction(){
    alert("hello");
  }
</script>
 </head>
<body>
<input type="submit" onClick="myFunction()">
</body>
</html>

Here is the JavaScript function which has an alert box. This function is called by clicking on the submit button.

How Do I Pop up an Alert in Javascript?

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