string comparision in javascript

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i have to compare two strings. if their cases are dissimilar than also it alerts a error. for this my code is as follows:

JavaScript

var a,b;

a = document.f1.t1.value;
b = document.f1.t2.value;
bb = '';
cc = '';

for(i=0;i<a.length;i++)
{
    for(j=0;j<b.length;j++)
    {
        if(b.charAt(j) >=65 && b.charAt(j) <= 90)
        {
            bb = bb + b.charAt(j);
        }
        else
            bb = bb +b.charAt(j);
    }

    if (a.charAt(i) > =65 && a.charAt(i) <= 90)
    {
        cc = cc + a.charAt(i);
    }
    else
        cc = cc + a.charAt(i);
    }

    if (bb == cc)
    {
        alert("strings are equal");
    }
    else
        alert("strings are unequal");
</script>
</head>
<body>
    <form name = "f1">
        <input type ="text" name ="t1">
        <input type ="text" name ="t2">
        <input type="button" value="ok" onclick="rev()">
    </form>
</body>
</html>

but is is not executing.where i am wrong?

Posted 5-Jun-13 1:58am

Rambo_Raja

Updated 5-Jun-13 2:04am

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

v4

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5 solutions

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be-unique · Answer 1 · 2013-06-05T02:07:00

JavaScript

<script type="text/javascript">
    var username = "Agent006";
    if(username == "Agent007")
    	document.write("Welcome special agent 007"); 
    else
    	document.write("Access Denied!"); 
    document.write("<br /><br />Would you like to try again?<br /><br />");
    
    // User enters a different name
    username = "Agent007";
    if(username == "Agent007")
    	document.write("Welcome special agent 007"); 
    else
    	document.write("Access Denied!"); 
</script>

Hope this helps.

Rockstar_ · Answer 2 · 2013-06-05T02:08:00

Hi,
For Comparing two strings :

JavaScript

function validate()
{
       a = document.f1.t1.value;
       b = document.f1.t2.value;
if(a.Length==b.Length)
{
       for(i=0;i<a.length;i++)>
        {
               if(a.charcodeat(i)!=b.charcodeat(i))
               alert('Something went wrong ');
               return false;
                
        }
}
else
{
  alert('Something went wrong');
  return false;
}

}

CPallini · Answer 3 · 2013-06-05T02:12:00

Your code makes no sense.

Quote:
if(b.charAt(j) >=65 && b.charAt(j) <= 90)
{
bb = bb + b.charAt(j);
}
else
bb = bb +b.charAt(j);

Here you end up doing the same thing (what?!) either if the condition is true and if it is false.

Quote:
if (bb == cc)
{
alert("strings are equal");
}

Here you are stating the strings are equal based on a single character equality.

salah9 · Answer 4 · 2013-06-05T02:36:00

Solution 4

use indexOf() method

ex:
var a = document.f1.t1.value;
var b = document.f1.t2.value;

if ( b.indexOf(a) > -1)
{
alert("data are same");
}
else
{
alert("Data are not same");
}

=indexOf() method will return -1 if value is not occuring.

Posted 5-Jun-13 2:36am

salah9

Zafar Sultan · Answer 5 · 2013-06-05T02:43:00

Solution 5

What's the problem then?

Run this script

JavaScript

<script language="javascript">
         
var b = "this is a sample string";
var a = "This Is A Sample String";
alert(a == b);
        
</script>

output will be false!

Posted 5-Jun-13 2:43am

Zafar Sultan

string comparision in javascript

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