Have your own javascript form validation plug-in_javascript skills

I wrote a form validation plug-in, which is very simple to use and can be expanded with more functions in the future, such as ajax validation.

There is a span tag under each form element that needs to be verified. The class of this tag has a valid which means it needs to be verified. If there is nullable, it means it can be empty; rule means validation rules, msg means error message; to means it needs to be verified. The name value of the element to be verified. If the element is single, to may not be written. This plug-in will traverse each valid span tag to find the element in front of it that needs to be verified, and verify it according to the rule. If the verification fails, the display border will be red, and an error message will be displayed when the mouse is placed on the element.

Verification timing: 1. Explicitly call the verification method when the submit button is clicked; 2. Verify when the element triggers blur.

Plug-in code:

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();
});

How to use:

1. Quote CSS and JS (jQuery must be quoted):

<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. Form HTML code (part of the code):

<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="^(&#63;!-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. Execute verification JS code:

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

Rendering:

The above is the javascript form validation plug-in written by the author myself. I hope it can help everyone.