自己编写了一个表单验证插件，支持ajax验证，使用起来很简单。
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。
插件代码：
CSS：
.failvalid { border: solid 2px red !important; }
JS：
/** * suxiang * 2014年12月22日 * 验证插件 */ SimpoValidate = { //验证规则 rules: { int: /^[1-9]\d*$/, number: /^[+-]?\d*\.?\d+$/ }, //初始化 init: function () { $(".valid").each(function () { //遍历span if ($(this)[0].tagName.toLowerCase() == "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 () { SimpoValidate.ajaxCheckResult = true; var bl = true; $(".valid").each(function () { //遍历span if ($(this)[0].tagName.toLowerCase() == "span") { var validSpan = $(this); var to = validSpan.attr("to"); var target; if (to) { target = $("input[name='" + to + "'],select[name='" + to + "'],textarea[name='" + to + "']"); } else { target = validSpan.prev(); } if (target) { if (!SimpoValidate.validOne(target, validSpan)) { bl = false; } } } }); return bl && SimpoValidate.ajaxCheckResult; }, //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"); var ajaxAction = validSpan.attr("ajaxAction"); 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 ($.trim(val) == "") { SimpoValidate.removehilight(target, msg); return true; } } if (rule) { var reg = new RegExp(rule); if (!reg.test(val)) { SimpoValidate.hilight(target, msg); return false; } } if (ajaxAction) { SimpoValidate.ajaxCheck(target, val, ajaxAction); } } else if (target[0].tagName.toLowerCase() == "textarea") { var val = target.text(); if (!nullable) { if ($.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; } } if (ajaxAction) { SimpoValidate.ajaxCheck(target, val, ajaxAction); } } } return true; }, ajaxCheckResult: true, ajaxCheck: function (target, value, ajaxAction) { var targetName = target.attr("name"); var data = new Object(); data[targetName] = value; $.ajax({ url: ajaxAction, type: "POST", data: data, async: false, success: function (data) { if (data.data == true) { SimpoValidate.removehilight(target); } else { SimpoValidate.ajaxCheckResult = false; SimpoValidate.hilight(target, data.data); } } }); }, //获取验证规则 getRule: function (validSpan) { var rule = validSpan.attr("rule"); switch ($.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; z-index:99999; left: 0; top: 0; background-color: #dceaf2; padding: 3px; border: solid 1px #6dbde4; visibility: hidden; line-height:20px; font-size:12px;"; $("body").append("<div>" + text + "</div>"); 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", top); divtips.css("left", left); }); }, //移除提示 removetips: function () { $(".div-tips").remove(); } }; $(function () { SimpoValidate.init(); });
如何使用：
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