Javascript_16_DOM_form exercise
Javascript_16_DOM_form练习
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK">
<title>DOM_form练习</title>
</head>
<body>
正则表达式对象
本对象包含正则表达式模式以及表明如何应用模式的标志。
语法 1
re = /pattern/[flags]
语法 2
re = new RegExp("pattern",["flags"])
参数
re
必选项。将要赋值为正则表达式模式的变量名。
Pattern
必选项。要使用的正则表达式模式。如果使用语法 1，用 "/" 字符分隔模式。如果用语法 2，用引号将模式引起来。
flags
可选项。如果使用语法 2 要用引号将 flag 引起来。标志可以组合使用，可用的有：
g （全文查找出现的所有 pattern）
i （忽略大小写）
m （多行查找）
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test 方法
返回一个 Boolean 值，它指出在被查找的字符串中是否存在模式。
rgexp.test(str)
参数
rgexp
必选项。包含正则表达式模式或可用标志的正则表达式对象。
str
必选项。要在其上测试查找的字符串。
说明
test 方法检查在字符串中是否存在一个模式，如果存在则返回 true，否则就返回 false。
全局 RegExp 对象的属性不由 test 方法来修改。
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^ 匹配输入字符串的开始位置。如果设置了 RegExp 对象的 Multiline 属性，
^ 也匹配 '\n' 或 '\r' 之后的位置。
$ 匹配输入字符串的结束位置。如果设置了RegExp 对象的 Multiline 属性，
$ 也匹配 '\n' 或 '\r' 之前的位置。
\w 匹配包括下划线的任何单词字符。等价于'[A-Za-z0-9_]'。
\W 匹配任何非单词字符。等价于 '[^A-Za-z0-9_]'。
(pattern) 匹配pattern 并获取这一匹配。
所获取的匹配可以从产生的 Matches 集合得到，
在VBScript 中使用 SubMatches 集合，
在JScript 中则使用 $0…$9 属性。要匹配圆括号字符，请使用 '\(' 或 '\)'。
g （全文查找出现的所有 pattern）
i （忽略大小写）
m （多行查找）
＝＝＝＝＝＝＝＝＝＝＝＝＝＝我是分割线＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
/*
* 需求：表单校验,带正则表达式~
思路：先实现一个具体的表单组件校验,再抽取为一个通用的!
*/
<script type="text/javascript">
function checkUser_1(){
//校验用户名(实现一个具体的表单组件校验先)
var flag;
var oUser= document.getElementsByName("user")[0];
var val = oUser.value;
//JS中,定义正则表达式,有两种方式
var reg = new RegExp("^[a-z]{4}$","i");//必须是四个字母,i表示不区分大小写。
// reg = new RegExp("^\\d{4}$");// 必须是四个数字。
// reg = /^\d{4}$/;
var oSpan = document.getElementById("span_id_user");
if(reg.test(name)){
oSpan.innerHTML = "用户名正确".fontcolor("green");
flag = true;
}else{
oSpan.innerHTML = "用户名错误".fontcolor("red");
flag = false;
}
return flag;
}
/*
* 抽取为一个通用的!(name,reg,spanId,info_ok,info_err)
*发现很多框的校验除了几个内容不同外，校验的过程是一样的。
* 所以进行了代码的提取。
*/
function check(name,reg,spanId,info_ok,info_err){
var flag;
var val = document.getElementsByName(name)[0].value;
var oSpan = document.getElementById(spanId);
if(reg.test(val)){
oSpan.innerHTML = info_ok.fontcolor("green");
flag = true;
}else{
oSpan.innerHTML = info_err.fontcolor("red");
flag = false;
}
return flag;
}
function checkUser(){
//校验用户名。4位字母
var reg = /^[a-z]{4}$/i;
return check("user",reg,"span_id_user","用户名正确","用户名错误");
}
function checkPsw(){
//校验密码；4位数字
var reg = /^\d{4}$/;
return check("psw",reg,"span_id_psw","密码格式正确","密码格式错误");
}
function checkRepsw(){
//校验确定密码。只要和密码一致即可。
var flag;
//获取密码框内容。
var psw = document.getElementsByName("psw")[0].value;
//获取确认密码框内容。
var repsw = document.getElementsByName("repsw")[0].value;
//获取确认密码的span区域。
var oSpan = document.getElementById("span_id_repsw");
if(psw==repsw){
oSpan.innerHTML = "两次密码一致".fontcolor("green");
flag = true;
}else{
oSpan.innerHTML = "两次密码不一致".fontcolor("red");
flag = false;
}
return flag;
}
function checkMail(){
//校验邮件
var reg = /^\w+@\w+(\.\w+)+$/i;
return check("mail",reg,"span_id_mail","邮件地址正确","邮件地址错误");
}
function checkForm(){
// 提交事件处理。全部检验合格才返回真！
if(checkUser() && checkPsw() && checkRepsw() && checkMail()){
return true;
}
return false;
}
</script>
<!--onblur方法是失去焦点,onfocus是获得焦点-->
<form id="form_id_1" onsubmit="return checkForm()">
用户名称：<input type="text" name="user" onblur="checkUser()" />
<span id="span_id_user"></span>
<br/>
输入密码：<input type="text" name="psw" onblur="checkPsw()" />
<span id="span_id_psw"></span>
<br/>
确定密码：<input type="text" name="repsw" onblur="checkRepsw()" />
<span id="span_id_repsw"></span>
<br/>
邮件地址：<input type="text" name="mail" onblur="checkMail()" />
<span id="span_id_mail"></span>
<br/>
<input type="submit" value="提交数据" />
</form>
＝＝＝＝＝＝＝＝＝＝＝＝＝＝我是分割线＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
/*
* 需求：form提交有两种！
第1种是：使用input type="submit" value="提交数据"
只要点击该submit按钮，会自动将所在的form表单中的所有数据打包发送到服务器
第2种是：
使用的form对象的submit()方法，实现自定义提交！
*/
<script type="text/javascript">
function mySubmit(){
//form提交方式之二：自定义提交,使用的是form对象的submit()方法
var oForm = document.getElementById("form_id_1");
oForm.submit();
}
</script>
<input type="button" value="我的提交" onclick="mySubmit()" />
</body>
</html>以上就是Javascript_16_DOM_form练习的内容，更多相关内容请关注PHP中文网（www.php.cn）！
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