Maximum length for javascript prompt box

[tnsmart]

I have been trying to figure out how to set a maximum number of characters that can be entered into a prompt box that appears as part of a javascript, activated by clicking a button on a PHP page. I've found lots of information on how to display an alert when too many characters are entered, but I want it to work like the maxlength attribute does for a textfield in HTML.

This is the code that I have right now:

function user()
  {
  var username=prompt("Please enter your name.","");
  if (username==null || username=="" || username==" ")
    {
    document.getElementById('message').innerHTML="Username invalid!";
    }
  else
    {
    return username;
    }
  }

Any help is appreciated. Thanks.

 

[bootedbear]

There is no way to do that with the standard prompt box.

Perhaps there's a jQuery prompt plugin you could use?

 

[angelwatt]

As mentioned the standard prompt window has no attributes to be attributed to it for setting a max length. You could implement your own prompt box though and use a standard input tag with the maxlength attribute set. Visitors can override these attributes anyways though so don't rely on it.