拥有一个属于自己的javascript表单验证插件

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。

插件代码：

CSS：

.failvalid
{
 border: solid 2px red !important;
}

JS：

/**
* 验证插件
*/

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 + "'],select[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 ($.trim(val) == "") {
  SimpoValidate.hilight(target, msg);
  return false;
  }
 }
 else {
  if ($.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;
  }
 }
 }
 }

 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("<div class='div-tips' style='" + divtipsstyle + "'>" + 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：

1、引用CSS和JS(必须引用jQuery)：

<link type="text/css" href="~/Scripts/SimpoValidate.css" rel="stylesheet" />
<script type="text/javascript" src="~/Scripts/jquery-1.8.2.js"></script>
<script type="text/javascript" src="~/Scripts/ValidateUtil.js"></script>

2、表单HTML代码(部分代码)：

<table class="table-test" cellpadding="0" cellspacing="0" style="border-collapse: collapse; width: 100%;">
 <tr>
 <td>
 <input name="c" value="" type="text" />
 <span class="valid nullable" rule="int" msg="可为空，请填写正整数"></span>
 </td>
 </tr>
 <tr>
 <td>
 <input name="d" value="" type="text" />
 <span class="valid" rule="number" msg="必填，请填写数字"></span>
 </td>
 </tr>
 <tr>
 <td>
 <select>
 <option value="-1">==请选择==</option>
 <option value="1">是</option>
 <option value="2">否</option>
 </select>
 <span class="valid" rule="^(?!-1$).+$" msg="必选"></span>
 </td>
 </tr>
 <tr>
 <td>
 <input name="a" value="1" type="checkbox" />
 <span>多</span>
 <input name="a" value="2" type="checkbox" />
 <span>少</span>
 <span class="valid" rule="" msg="必选" to="a"></span>
 </td>
 </tr>
 <tr>
 <td>
 <input name="b" value="1" type="radio" />
 <span>狗</span>
 <input name="b" value="2" type="radio" />
 <span>猫</span>
 <span class="valid" rule="" msg="必选" to="b"></span>
 </td>
 </tr>
 <tr>
 <td>
 <textarea cols="20" rows="5" style="height: 50px; width: 300px;"></textarea>
 <span class="valid nullable" rule="^(.|\n){5,100}$" msg="可为空，长度必须大于等于5小于等于100"></span>
 </td>
 </tr>
</table>

3、执行验证JS代码：

//保存数据
function save() {
 if (SimpoValidate.valid()) { //执行验证
 $("#frm").submit(); //提交表单
 }
}

效果图：

以上就是作者自己动手编写的javascript表单验证插件，希望能够帮助到大家。