自己编写了一个表单验证插件，使用起来很简单，以后还可以扩展更多的功能，比如ajax验证。
每个需要验证的表单元素下面有一个span标签，这个标签的class有一个valid表示需要验证，如果有nullable则表示可为空；rule表示验证规则，msg表示错误提示信息；to表示要验证的元素的name值，如果元素是单个的，to可以不写。该插件会遍历每个有valid的span标签，找出它前面需要验证的元素，根据rule验证，如果验证不通过，则显示边框为红色，鼠标放在元素上时显示错误信息。
验证时机：1、点击提交按钮时显式调用验证方法；2、当元素触发blur时验证。
CSS：
JS：
SimpoValidate = {
//验证规则
rules: {
int: /^[1-9]\d$/,number: /^[+-]?\d.?\d+$/
},//初始化
init: function () {
$("span[class*='valid']").each(function () { //遍历span
var validSpan = $(this);
var to = validSpan.attr("to");
var target;
if (to) {
target = $("input[name='" + to + "'],select[name='" + to + "'],textarea[name='" + to + "']");
} else {
var target = validSpan.prev();
}
if (target) {
target.blur(function () {
SimpoValidate.validOne(target,validSpan);
});
}
});
},//验证全部，验证成功返回true
valid: function () {
var bl = true;
$("span[class*='valid']").each(function () { //遍历span
var validSpan = $(this);
var to = validSpan.attr("to");
var target;
if (to) {
target = $("input[name='" + to + "'],textarea[name='" + to + "']");
} else {
target = validSpan.prev();
}
if (target) {
if (!SimpoValidate.validOne(target,validSpan)) {
bl = false;
}
}
});
return bl;
},//单个验证，验证成功返回true
validOne: function (target,validSpan) {
SimpoValidate.removehilight(target,msg);
var rule = SimpoValidate.getRule(validSpan);
var msg = validSpan.attr("msg");
var nullable = validSpan.attr("class").indexOf("nullable") == -1 ? false : true; //是否可为空
var to = validSpan.attr("to");
if (target) {
//checkBox或radio
if (target[0].tagName.toLowerCase() == "input" && target.attr("type") && (target.attr("type").toLowerCase() == "checkBox" || target.attr("type").toLowerCase() == "radio")) {
var checkedInput = $("input[name='" + to + "']:checked");
if (!nullable) {
if (checkedInput.length == 0) {
SimpoValidate.hilight(target,msg);
return false;
}
}
}
//input或select
if (target[0].tagName.toLowerCase() == "input" || target[0].tagName.toLowerCase() == "select") {
var val = target.val();
if (!nullable) {
if ($.trim(val) == "") {
SimpoValidate.hilight(target,msg);
return false;
}
}
else {
if ($.trim(val) == "") {
SimpoValidate.removehilight(target,msg);
return true;
}
}
if (rule) {
var reg = new RegExp(rule);
if (!reg.test(val)) {
SimpoValidate.hilight(target,msg);
return false;
}
}
}
else if (target[0].tagName.toLowerCase() == "textarea") {
var val = target.text();
if (!nullable) {
if ($.trim(val) == "") {
SimpoValidate.hilight(target,msg);
return false;
}
}
}
}
return true;
},//获取验证规则
getRule: function (validSpan) {
var rule = validSpan.attr("rule");
switch ($.trim(rule)) {
case "int":
return this.rules.int;
case "number":
return this.rules.number;
default:
return rule;
break;
}
},//红边框及错误提示
hilight: function (target,msg) {
target.addClass("failvalid");
target.bind("mouSEOver",function (e) {
SimpoValidate.tips(target,msg,e);
});
target.bind("mouSEOut",function () {
SimpoValidate.removetips();
});
},//取消红边框及错误提示
removehilight: function (target) {
target.unbind("mouSEOver");
target.unbind("mouSEOut");
target.removeClass("failvalid");
SimpoValidate.removetips();
},//显示提示
tips: function (target,text,e) {
var divtipsstyle = "position: absolute; left: 0; top: 0; background-color: #dceaf2; padding: 3px; border: solid 1px #6dbde4; visibility: hidden; line-height:20px; ";
$("body").append("
var divtips = $(".div-tips");
divtips.css("visibility","visible");
var top = e.clientY + $(window).scrollTop() - divtips.height() - 18;
var left = e.clientX;
divtips.css("top",top);
divtips.css("left",left);
$(target).mousemove(function (e) {
var top = e.clientY + $(window).scrollTop() - divtips.height() - 18;
var left = e.clientX;
divtips.css("top",left);
});
},//移除提示
removetips: function () {
$(".div-tips").remove();
}
};
$(function () {
SimpoValidate.init();
});
如何使用：
1、引用CSS和JS(必须引用jQuery)：
