demonstrate exception handling in java script
To create an html page to
demonstrate exception handling in javascript, Create an html page named as
―exception.html and do the following.
i. within the script tag write
code to handle exception
a) define a method RunTest() to
get any string values(str) from the user and call the method Areletters(str).
b) In Areletters(str) method
check whether str contain only alphabets (a-z, AZ), if not throw exception.
c) Define a exception method
Input Exception(str) to handle the exception thrown by the above method.
<!DOCTYPE html>
<html>
<body >
<p >Click the button to demonstrate Exception
handling </p>
<button
onclick="RunTest()" >Touch me</button>
<p id="message"></p>
<script>
function
isalpha(str) {
var f=0;
for(i=0;i<str.length;i++)
{
if
(((str[i] >= 'a') && (str[i] <= 'z')) || ((str[i] >= 'A')
&& (str[i] <= 'Z')))
f=0;
else
f=1;
}
if (f==0)
return 1;
else
return 0;
}
function RunTest() {
var str =
prompt("Please enter any string", "sambasiva");
try {
if(str
== "") throw "is empty";
else
if(!isalpha(str)) throw "string must contain alphabets only";
else
document.getElementById("message").innerHTML =
"Entered string: " + str;
}
catch(err)
{
document.getElementById("message").innerHTML = "Error:
" + err + ".";
}
}
</script>
</body>
</html>
posted by siddu @ March 03, 2018
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