convert a string lower case to uppercase and uppercase to lowercase in javascript

Question

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i want to covert lower case letter to uppercase and vice versa in javascript. my code is as follows:

XML

<html>
<head>
<title>validation</title>
<script language= javascript>
function strcon()
{
var a ;
 a = document.f1.t1.value;
for(i=0;i<a.length;i++)
{
if(a.charCodeAt(i) >= 65 && a.charCodeAt(i) <= 90)
 {
  alert(a.toLowerCase(i));
}
else
 alert(a.toUpperCase(i));
}
}
</script>
</head>
<body>
<form name=f1>
<input type=text name=t1><br>
<input type=button value=ok onclick="strcon()">

my problem is when i click on button i want simultaneous conversion of string case but getting string case conversion one by one .

Posted 4-Jun-13 23:55pm

Rambo_Raja

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Comments

SoMad 5-Jun-13 6:12am

Are you saying that you see the characters displayed one by one in a popup box? That would be because you have the alert() inside the loop. Instead of displaying each character, put them in a string and display the entire string when the loop is completed.

Soren Madsen

Rambo_Raja 5-Jun-13 6:32am

var a ;
a = document.f1.t1.value;
var kk;
for(i=0;i<a.length;i++)
{
if(a.charcodeat(i)>= 65 && a.charCodeAt(i) <= 90)
{
kk = (a.toLowerCase(i));
}
else
kk =(a.toUpperCase(i));
}
alert(kk);
}
like this?but it also not working.

SoMad 5-Jun-13 6:45am

No, this way you reassign the variable every time you go through the loop. You need to add to it.
I am writing this on my phone, so I am afraid explaining it like this is the best I can do to help you.

Soren Madsen

Rambo_Raja 5-Jun-13 6:51am

kk.thanks

SoMad 5-Jun-13 7:13am

Sorry, but you are really close to having the solution.

Soren Madsen

2 solutions

Solution 3

<nobr>Bellow is the result of the alternative changed case of above sentence::

Posted 29-May-15 21:07pm

Member 11729765

Updated 29-May-15 21:16pm

v4

Comments

Member 11729765 30-May-15 3:10am

He you got your Answer reply me to sanjay447 at gmail.com

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Zafar Sultan · Accepted Answer · 2013-06-05T00:10:00

Solution 1

JavaScript

<script language="javascript">
        function strcon() {
            var b = '';
            var a = "This Is A Sample String";
            for (i = 0; i < a.length; i++) {
                if (a.charCodeAt(i) >= 65 && a.charCodeAt(i) <= 90) {
                    b = b + a.charAt(i).toLowerCase();
                }
                else
                    b = b + a.charAt(i).toUpperCase();
            }
            alert(b);
        }
    </script>

Posted 5-Jun-13 0:10am

Zafar Sultan

Updated 5-Jun-13 1:13am

v2

Comments

SoMad 5-Jun-13 6:41am

No, as I understand it, he wants to 'flip' the cases.
Turn "A Test String"
into "a tEST sTRING"

Soren Madsen

Rambo_Raja 5-Jun-13 6:44am

yes..exactly

Zafar Sultan 5-Jun-13 7:04am

OK. Let me try. Will get back to you shortly.

Zafar Sultan 5-Jun-13 7:14am

Check my updated solution.

SoMad 5-Jun-13 7:20am

That looks like it will work :-)

Soren Madsen

Zafar Sultan 5-Jun-13 7:22am

Yeah. It's working...

Rambo_Raja 5-Jun-13 7:28am

great man...Thanks.its really working.

Zafar Sultan 5-Jun-13 7:49am

Welcome.