Check if variable contains data

[tyrant1969]

Is there a way in Javascript to check if a variable has part of a certain value?

For example - I am prompting my users to enter a URL into a javascript prompt box. I want to make sure that the user has entered an HTTP:// at the start of the URL.

How can this be done?

 

[trollacious]

if (variablename.toLowerCase().indexOf('

http://')

> -1)
{
//text typed in is correct
}
else
{
alert('You gotta use "

http://"

at the beginning');
}

Lee