How can I check if a javascript variable contains a string or not?

Question

I have a variable: $form.attr('action') that contains one of the following:

action="/Administration/Contents/JsonCreate"
action="/Administration/Contents/JsonEdit"
action="/Administration/Contents/JsonDelete"

How can I with an if () statement check to see if it contains the word "JsonEdit" ?

Answer 1

Use indexOf():

var str = $form.attr('action');
if(str.indexOf("JsonEdit")>=0){
 //do something you want
}

Answer 2

You can use RegExp test to check if you have something there. test returns true if a match is found, and false if not.

if(/JsonEdit/.test(action)){
 //there is something
}

• ThiefMaster: I'd say a regex is not appropriate but overkill if you just want to check if a certain static string is inside another string.
• RobG: @ThiefMaster—overkill? Hardly, but indexof is a lot faster (not that anyone would notice for a one-off).