Form validation check - no numerals

[sweetamy]

i am making an html form......it should check the values before accepting the data in the database,,,,,,, ,,,,,,a field name USER NAME should check if the value entered is only a character value nd no numerals,,,nd if numerals r entered it should raie an exception i.e. alert msg...........h ow is it done using java script......... .
thanx

[shoonya]

say val=the value entered by user

[HTML]
for(i=0; i<val.length; i++){
if(check val[i] for no) {
alert('msg')
return false
}
}
return true
[/HTML]

for advance use you can use regular expression

[gits]

hi ...

the regEx is the cool way ... ;)

[CODE=javascript]
// our regEx (/\d/g) checks for numbers in the string we
// give as parameter to the built in js-method test(value);

// this returns false
/\d/g.test('abcg');

// this returns true
/\d/g.test('abc3g') ;
[/CODE]

of course you may use the shown loop above and to check whether a part (val[i]) is a number or not ... you may use the isNaN(value); function ... that returns false when value is a number ;) (isN(ot)aN(umbe r) -> simple name of that function isn't it? ) ...

kind regards

[acoder]

Changed thread title.

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