JS实现支持Ajax验证的表单插件_javascript技巧

本文为大家分享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：

/**
* 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 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：
Edit页面：

@using Model.Suya;
@{
  ViewBag.Title = "Add";
  Layout = "~/Views/Shared/_Layout.cshtml";
}
@{
  List<sys_post> postList = (List<sys_post>)ViewData["postList"];
  sys_post post = (sys_post)ViewData["post"];
}
<script type="text/javascript">
  $(function () {
    //部门树
    $('#dept').combotree({
      url: 'GetDeptTree',
      required: false,
      checkbox: true,
      onLoadSuccess: function () {
        $('#dept').combotree('setValue', "@(post.depCode)");
      }
    });

    //操作结果
    $("#ifrm").load(function (data) {
      var data = eval("(" + $("#ifrm").contents().find("body").html() + ")");
      alert(data.msg);
      if (data.ok) back();
    });

    $("select[name='postLevel']").find("option[value='@(post.postLevel)']").attr("selected", "selected");
  });

  //保存
  function save() {
    if (valid()) {
      $("#frm").submit();
    }
  }

  //验证
  function valid() {
    var dept = $("input[name='dept']");
    if (!dept.val()) {
      SimpoValidate.hilight(dept.parent(), "请选择所属部门");
    } else {
      SimpoValidate.removehilight(dept.parent());
    }

    return SimpoValidate.valid();
  }

  //返回
  function back() {
    parent.$('#ttTab').tabs('select', "岗位管理");
    var tab = parent.$('#ttTab').tabs('getSelected');
    tab.find("iframe").contents().find("#btnSearch").click();
    parent.$("#ttTab").tabs('close', '修改岗位信息');
  }
</script>
<div class="tiao">
  <input type="button" class="submit_btn" value="保存" onclick="save()" />
  <input type="button" class="submit_btn" value="返回" onclick="back()" />
</div>
<iframe id="ifrm" name="ifrm" style="display: none;"></iframe>
<form id="frm" method="post" enctype="multipart/form-data" action="/HR/PostManage/SaveEdit&#63;id=@(post.id)"
target="ifrm">
<div class="adminMainContent">
  <div class="box">
    <div class="box-title">
      基础信息
    </div>
    <div class="box-content">
      <table cellpadding="0" cellspacing="0" class="detail" width="100%">
        <tr>
          <td class="title">
            <span class="mst">*</span>岗位名称：
          </td>
          <td style="width: 35%;">
            <input type="text" class="xinxi_txt" name="postName" value="@post.postName" />
            <span class="valid" msg="必填，且长度不能超过50" rule="^(.|\n){0,50}$"></span>
          </td>
          <td class="title">
            <span class="mst">*</span>岗位编号：
          </td>
          <td style="width: 35%;">
            <input type="text" class="xinxi_txt" name="postCode" value="@post.postCode" />
            <span class="valid" msg="必填，且长度不能超过20" rule="^(.|\n){0,20}$" ajaxaction="/HR/PostManage/AjaxCheckPostCode&#63;id=@post.id">
            </span>
          </td>
        </tr>
        <tr>
          <td class="title">
            <span class="mst">*</span> 所属部门：
          </td>
          <td style="width: 35%;">
            <input type="text" name="depCode" id="dept" class="easyui-combotree" style="height: 30px;" />
          </td>
          <td class="title">
            <span class="mst">*</span>汇报对象：
          </td>
          <td style="width: 35%;">
            <select class="xueli" name="reportPostCode" id="agreementType">
              <option value="" selected="selected">==请选择==</option>
              @foreach (sys_post item in postList)
              {
                if (item.postCode == post.reportPostCode)
                {
                <option value="@item.postCode" selected="selected">@item.postName</option>
                }
                else
                {
                <option value="@item.postCode">@item.postName</option>
                }
              }
            </select>
            <span class="valid" msg="请选择合同分类">
          </td>
        </tr>
        <tr>
          <td class="title">
            <span class="mst">*</span>岗位级别：
          </td>
          <td style="width: 35%;">
            <select class="xueli" name="postLevel">
              <option value="" selected="selected">==请选择==</option>
              <option value="1">1</option>
              <option value="2">2</option>
              <option value="3">3</option>
              <option value="4">4</option>
              <option value="5">5</option>
              <option value="6">6</option>
            </select>
            <span class="valid" msg="请选择岗位级别">
          </td>
          <td class="title">
          </td>
          <td style="width: 35%;">
          </td>
        </tr>
        <tr>
          <td class="title">
            <span class="mst">*</span>备注：
          </td>
          <td colspan="3" style="width: 35%;">
            <textarea name="remarks" style="width: 500px;">@post.remarks</textarea>
            <span class="valid" msg="长度不得超过500" rule="^(.|\n){0,500}$"></span>
          </td>
        </tr>
      </table>
    </div>
  </div>
</div>
</form>

效果图：

以上就是本文的全部内容，希望对大家的学习有所帮助。