How can I check if one string contains another substring in JavaScript? JavaScript: string contains

Q. How can I check if one string contains another substring in JavaScript?

Usually I would expect a String.contains() method, but there doesn't seem to be one.

My code is:

var allLinks = content.document.getElementsByTagName("a");

for (var i=0, il=allLinks.length; i<il; i++) {
   

   elm = allLinks[i];
   var test = elm.getAttribute("class");
   if (test.indexof("title") !=-1) {
   alert(elm);
   foundLinks++;

}
}

if (foundLinks === 0) {
   alert("No title class found");
}
else {
   alert("Found " + foundLinks + " title class");
}

Solution :

var s = "foo";
alert(s.indexOf("oo") != -1);

indexOf returns the position of the string in the other string. If not found, it will return -1.

Cheers !
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