How can I check if one string contains a variable value in JavaScript?

Question

I have this code. I am using contains function to check if the value stored in the string or not but getting error. can anyone help me how to check this.

var lang = reply.LANGUAGES[InstObj.langId];
var instElement = reply.QUAL[iCount] ;
if(instElement.contains(lang))
{
 alert(lang);
}
else
{
 alert(instElement);
} 

• Jason Evans: This might help stackoverflow.com/questions/1789945/… Use indexOf
• Andy: Interestingly there is a contains() coming soon, but currently few browsers support it.
• Andy: Don't confuse this with the contains method in jQuery tho. That's specifically a DOM method.
• aberry: Use indexOf...w3schools.com/jsref/jsref_indexof.asp

Answer 1

Use indexOf()

The indexOf() method returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex, returns -1 if the value is not found.

Change your code as

var lang = reply.LANGUAGES[InstObj.langId];
var instElement = reply.QUAL[iCount] ;
if(instElement.indexOf(lang) > -1)
{
 alert(lang);
}
else
{
 alert(instElement);
}