December 2003
Intermediate to advanced
764 pages
24h 58m
English
Content preview from JavaServer Pages, 3rd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Generating JavaScript Code
Example 17-6 shows a modified version of the User Info page used in the examples in Chapter 10.
Example 17-6. Input form with client-side validation code (clientscript.jsp)
<%@ page contentType="text/html" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>User Info Entry Form</title>
<script language="JavaScript"> <!-- Hide from browsers without JavaScript support function isValidForm(theForm) { if (isEmpty(theForm.userName.value)) { theForm.userName.focus( ); return false; } if (!isValidDate(theForm.birthDate.value)) { theForm.birthDate.focus( ); return false; } if (!isValidEmailAddr(theForm.emailAddr.value)) { theForm.emailAddr.focus( ); return false; } if (!isValidNumber(theForm.luckyNumber.value, 1, 100)) { theForm.luckyNumber.focus( ); return false; } return true; } function isEmpty(aStr) { if (aStr.length == 0) { alert("Mandatory field is empty"); return true; } return false; } function isValidDate(dateStr) { var matchArray = dateStr.match(/^[0-9]+-[0-1][0-9]-[0-3][0-9]$/) if (matchArray == null) { alert("Invalid date: " + dateStr); return false; } return true; } function isValidEmailAddr(emailStr) { var matchArray = emailStr.match(/^(.+)@(.+)\.(.+)$/) if (matchArray == null) { alert("Invalid email address: " + emailStr); return false; } return true; } function isValidNumber(numbStr, start, stop) { var matchArray = numbStr.match(/^[0-9]+$/) if ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.