Checking String Content with JavaScript

Question

I've got myself a project where I have to determine if a string contains a set string. Example: What I'm looking for website.com What is might look like jsngsowebsite.comadfjubj

So far my own endevours have yielded this:

titletxt = document.getElementById('title');
titlecheck=titletxt.IndexOf("website.com");
if (titlecheck>=0) {
 return false;
}

Which doesn't seem to be doing the trick, any suggestions?

Answer 1

function text( el ) {
 return el.innerText ? el.innerText : el.textContent;
}
function contains( substring, string ) {
 return string.indexOf(substring)>=0
}
contains( 'suggestions', text( document.getElementsByTagName('body')[0] ) )

Replace suggestions and document.getElements... with a string and a DOM element reference.

titlecheck=titletxt.IndexOf("website.com");

That looks like you're trying to use the IndexOf ( lowercase the I ) on a DOM element which won't even have that method, the text is inside the textContent ( standard DOM property ) or innerText ( IE specific property ).

• gnarf: the contains function should be >= 0 - but otherwise +1 for pointing out the innerText of a DOM element
• meder omuraliev: thanks - slipped my mind, though innerText is IE DOM specific.

Answer 2

Javascript functions are case sensitive - indexOf not IndexOf

Answer 3

You can use the indexOf() method:

title = "lalalawebsite.comkkk";

indexOf returns -1 if the string "website.com" isn't found in title

titlecheck = title.indexOf("website.com") > 0 ? "found" : "not found";
alert(titlecheck);

Answer 4

You could also use String.match(...)

title = document.getElementById('title');
titletxt = title.innerText ? title.innerText : title.textContent
titlecheck = titletxt.match("website.com");
 if (titlecheck != null ) {
 return false;
 }

String.match returns null if no match is found, and returns the search string("website.com") if a match is found