Problem with code

[kba]

<script>
var name = prompt("What is your name?");
if (name != null) {
alert("Hello " + name);
}
else {
alert("You did not tell me your name. ");
}
</script>

I cannot get this code to work (I'm a rank beginner). If I enter a name and click OK, it comes back with "Hello name" as it should. BUT... if I click CANCEL, it comes back with "Hello null" instead of "You did not tell me your name". Same thing if I don't enter a name and click OK.

I have tried this in the HEAD section. In the BODY section of my html page. No difference. I've tried it as a separate js file. I've played with spacing.

Cannot get it to work. This is from a book, and other code snippets they provide work, but not this one. Any help would be greatly appreciated.

 

[FResher]

Hello !

read one more time about "prompt" function in Javascript :

Window: prompt() method - Web APIs | MDN

window.prompt() instructs the browser to display a dialog with an optional message prompting the user to input some text, and to wait until the user either submits the text or cancels the dialog.

developer.mozilla.org

<script language="Javascript" type="text/javascript"> // mention Javascript type Mime

var answer = "Hello " ;

answer += prompt("What is your name?"); // joining response with 'answer' var. ( if one input )

if(answer.length == 6){ // "Hello " have 6 characters, never less, never more.

  answer = "You did not tell me your name. ";
// if no 'input' we replace the first String by another one.

}

alert(answer);

</script>

 

[kba]

<script language="Javascript" type="text/javascript"> // mention Javascript type Mime var answer = "Hello " ; answer += prompt("What is your name?"); // joining response with 'answer' var. ( if one input ) if(answer.length == 6){ // "Hello " have 6 characters, never less. answer = "You did not tell me your name. "; // if no 'input' we replace the first String by another one. } alert(answer); </script>

If I enter a name, this returns "Hello Beth" as it should. If I hit CANCEL, it returns "Hello null". rather than "You did not tell me your name".

I have been playing with this code all evening and finally came up with this:
<script>
var name = prompt("What is your name?");
if (name != "null") {
alert("Hello " + name);
}
else {
alert("You did not tell me your name. ");
}
</script>

The only difference being that I placed NULL in double-quotes. This works as it should.

Please know I really appreciate your response and it's been helpful in my efforts to figure this out. Thank you.