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Posted by cwdjrxyz on 01/08/07 17:39
Tom wrote:
> Being a newbie to JS, I would appreciate some advice. When a visitor
> enters a number into a textbox, I want to check that it is 15 digits long
> and then display a message accordingly and the following script does that
> OK. However, I want also to make sure that only "numbers" are entered and
> no other characters. Again the attached does this but is clumsy to say the
> least! How do I get it to loop back to the input box if it contains a
> non-numeric, before it goes off to check for 15 digits?
> <script>
> var ok = " This chip will work";
> var nook = "This chip will not work";
> function check_input()
> {
> var entry = document.forms.f.textfield.value;
> var length = entry.length
> document.clear();
> res = isNaN(entry) ? "please enter only numbers": "Press OK to continue";
> alert(res);
> document.write("<body bgcolor=\"44eedd\">");
> document.write("<body text=\"000000\">");
> document.write("<B><font size=3 face='arial'>")
> if(length == 15) document.write(ok);
> else
> document.write(nook);
> }
> </script>
There are people here who use javascript, and some may answer you.
However I also suggest that you go to the Usenet group
comp.lang.javascript. They have an extensive FAQ that might be useful
to you and might help. You are quite right in wanting to check for
charcter length entered and checking for numbers only also, since there
are people who will enter nearly anything into a form, including hacker
scripts. Also server side script such as php sometimes can have
advantages, especially if some of your site visitors have javascript
turned off.
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