Unable to compare two Strings in javascript

Question

I am trying two compare two strings in JavaScript. But I guess there is some problem while comparing. It doesn't show the results.

if(ajaxRequest.readyState == 4){

    var msg = ajaxRequest.responseText;
    var fld = document.getElementById("prtCnt");
    if(msg == "false") {
        var msg = "This User Name is already taken !!!!";
        fld.className = "bp_invalid";
        //   fld.style.color=green;
        fld.innerHTML=msg;
    }

Can any body tell me where the problem is? Thanks.

with out if condition it shows me false on web page. But with if it fails. — adesh
– adesh, Commented Mar 3, 2012 at 5:09
You might as well add the following "print" statement to see what value you are receiving in msg: alert(msg); Put that before your if(msg == 'false')... test, and amend your question with that additional information. — dyoo
– dyoo, Commented Mar 3, 2012 at 5:20

snjoetw · Accepted Answer · 2012-03-03 05:17:58Z

5

You might want to check if there's any space before or after the "false" string that you return from the server. You can do it easily with this:

alert('"' + msg + '"');

If there is extra space, you can just do:

msg = msg.trim();

and then do your if statement

answered Mar 3, 2012 at 5:17

snjoetw

4092 silver badges7 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

adesh Over a year ago

it worked thanks a lot. But can you tell me why there was whit space in msg While i was just returning a false word via out.print("false");

snjoetw Over a year ago

Are you calling out.print("false"); from a jsp page? Maybe there's extra space before the starting tag or after the closing tag?

adesh Over a year ago

How can i get rid of Whit spaces . Is there any way instead of using trim() method as IE doesn't support it. Thanks

Nicolas Manzini Over a year ago

Pffious lost half a hour to discover my string had a whitespace somewhere.

steveukx · Accepted Answer · 2012-03-03 05:18:48Z

1

Ensure that there is no white space around the word "false" with something like:

if( msg.match(/\s*false\s*/i) )

answered Mar 3, 2012 at 5:18

steveukx

4,34321 silver badges27 bronze badges

Collectives™ on Stack Overflow

Unable to compare two Strings in javascript

2 Answers 2

4 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

4 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related