本文实例讲述了Ajax异步方式实现登录与验证的详细代码，分享给大家供大家参考。具体如下：

登录代码

这个是使用Bootstrap3的组件功能实现的

<div class="login_con_R"> <h4>登录</h4> <FORM id="loginFormId" class="form-horizontal" action="login" method="post"> <div class="form-group input-group"> <span class="input-group-addon"><span class="glyphicon glyphicon-user"></span></span> <input type="text" class="form-control" placeholder="用户名" name="username" id="j_username" value="koala"> </div> <div class="form-group input-group"> <span class="input-group-addon"><span class="glyphicon glyphicon-lock"></span></span> <input type="password" name="password" id="j_password" class="form-control" placeholder="密码" value="888888"/> </div> <div class="form-group input-group" style="margin-top: 45px;"> <button type="button" class="btn btn-primary btn-block" id="loginBtn">登录</button> </div> </FORM> </div>

异步登录请求的代码

<script> $(function(){ var btnLogin = $('#loginBtn'); var form = $('#loginFormId'); $('body').keydown(function(e) { if (e.keyCode == 13) { dologin(); } }); btnLogin.on('click',function() { dologin(); }); var dologin = function() { var userNameElement = $("#j_username"); var passwordElement = $("#j_password"); var username = userNameElement.val(); var password = passwordElement.val(); if (!Validation.notNull($('body'), userNameElement, username, '用户名不能为空')) { return false; } if (!Validation.notNull($('body'), passwordElement, password, '密码不能为空')) { return false; } btnLogin.attr('disabled', 'disabled').html('正在登录...'); var param = form.serialize(); $.ajax({ url: contextPath+"/login.koala", dataType: "json", data: param, type: "POST", success: function(data){ if(data.success){ $('.login_con_R').message({ type: 'success', content: '登录成功！' }); window.location.href=contextPath+"/index.koala"; }else{ btnLogin.removeAttr('disabled').html('登录'); $('.login_con_R').message({ type: 'error', content: data.errorMessage }); } } }); }; }); </script>

使用到的验证js代码Validation.js

Validator = { Require : {expression:/.+/,errorMsg:"该字段不能为空"}, Email : {expression:/^\w+([-+.]\w+)*@\w+([-.]\\w+)*\.\w+([-.]\w+)*$/,errorMsg:"Email格式不正确"}, Mobile:{expression:/^(1[3|5|8]{1}\d{9})$/,errorMsg:"手机格式不正确"}, TelePhone:{expression:/^(((0\d{2,3}-)?\d{7,8}(-\d{4})?))$/,errorMsg:"电话号码格式不正确"}, IdCard:{expression:/^\d{15}(\d{2}[A-Za-z0-9])?$/,errorMsg:"身份证号码格式不正确"}, Number:{expression:/^-?(\d+|[1-9]\d*\.\d+|0\.\d*[1-9]\d*|0?\.0+|0)$/,errorMsg:"仅支持数字"}, English:{expression:/^[A-Za-z]+$/,errorMsg:"仅支持英文字符"}, Chinese:{expression:/^[\u0391-\uFFE5]+$/,errorMsg:"仅支持中文字符"}, URL:{expression:/^http:\/\/[A-Za-z0-9]+\.[A-Za-z0-9]+[\/=\?%\-&_~`@[\]\':+!]*([^<>\"\"])*$/,errorMsg:"URL地址格式不正确"}, Regex:{errorMsg:"格式不正确"}, UnSafe : /^(([A-Z]*|[a-z]*|\d*|[-_\~!@#\$%\^&\*\.\(\)\[\]\{\}<>\?\\\/\'\"]*)|.{0,5})$|\s/, IsSafe : function(str){return !this.UnSafe.test(str);}, SafeString : {expression:"this.IsSafe(value)",errorMsg:"仅支持中文字符"}, ErrorItem : [document.forms[0]], ErrorMessage : ["以下原因导致提交失败：\t\t\t\t"], Validate : function(theForm, mode){ var obj = theForm || event.srcElement; var count = obj.elements.length; this.ErrorMessage.length = 1; this.ErrorItem.length = 1; this.ErrorItem[0] = obj; for(var i=0;i<count;i++){ with(obj.elements[i]){ if(disabled)continue; var _dataType = getAttribute("dataType"); if(typeof(_dataType) == "object" || typeof(this[_dataType]) == "undefined") continue; this.ClearState(obj.elements[i]); if(getAttribute("require") == "false" && value == "") continue; var errorMsg = getAttribute("errorMsg")? getAttribute("errorMsg") : this[_dataType].errorMsg; errorMsg = errorMsg || "invalid"; var validateExpr = getAttribute("validateExpr"); validateExpr = validateExpr || this[_dataType].expression; switch(_dataType){ case "Date" : case "Repeat" : case "Range" : case "Compare" : case "Custom" : case "Group" : case "Limit" : case "LimitB" : case "SafeString" : if(!eval(validateExpr)) { this.AddError(i, errorMsg); } break; default : if(!eval(validateExpr).test(value)){ this.AddError(i, errorMsg); } break; } } } if(this.ErrorMessage.length > 1){ var content = this.ErrorMessage[1].replace(/\d+:/," "); var $element = $(this.ErrorItem[1]); var name = $element.attr('name'); if(name.indexOf('DTO') != -1){ name = name.split('.')[1]; } var $targetElement = $element; var $tempElement = $targetElement.closest('form').find('#' + name + 'ID'); if($tempElement.hasClass('select')){ $targetElement = $tempElement; } showErrorMessage($element.closest('.modal'), $targetElement, content); return false; } return true; }, limit : function(len,min, max){ min = min || 0; max = max || Number.MAX_VALUE; return min <= len && len <= max; }, LenB : function(str){ return str.replace(/[^\x00-\xff]/g,"**").length; }, ClearState : function(elem){ with(elem){ if(style.color == "red") style.color = ""; var ligertipid = getAttribute("ligertipid"); if(ligertipid && ligertipid != ""){ removeAttribute("ligertipid"); $(elem).ligerHideTip(); } } }, AddError : function(index, str){ this.ErrorItem[this.ErrorItem.length] = this.ErrorItem[0].elements[index]; this.ErrorMessage[this.ErrorMessage.length] = this.ErrorMessage.length + ":" + str; }, Exec : function(op, reg){ return new RegExp(reg,"g").test(op); }, compare : function(op1,operator,op2){ switch (operator) { case "NotEqual": return (op1 != op2); case "GreaterThan": return (op1 > op2); case "GreaterThanEqual": return (op1 >= op2); case "LessThan": return (op1 < op2); case "LessThanEqual": return (op1 <= op2); default: return (op1 == op2); } }, MustChecked : function(name, min, max){ var groups = document.getElementsByName(name); var hasChecked = 0; min = min || 1; max = max || groups.length; for(var i=groups.length-1;i>=0;i--) if(groups[i].checked) hasChecked++; return min <= hasChecked && hasChecked <= max; }, IsDate : function(op, formatString){ formatString = formatString || "ymd"; var m, year, month, day; switch(formatString){ case "ymd" : m = op.match(new RegExp("^\\s*((\\d{4})|(\\d{2}))([-./])(\\d{1,2})\\4(\\d{1,2})\\s*$")); if(m == null ) return false; day = m[6]; month = m[5]--; year = (m[2].length == 4) ? m[2] : GetFullYear(parseInt(m[3], 10)); break; case "dmy" : m = op.match(new RegExp("^\\s*(\\d{1,2})([-./])(\\d{1,2})\\2((\\d{4})|(\\d{2}))\\s*$")); if(m == null ) return false; day = m[1]; month = m[3]--; year = (m[5].length == 4) ? m[5] : GetFullYear(parseInt(m[6], 10)); break; default : break; } var date = new Date(year, month, day); return (typeof(date) == "object" && year == date.getFullYear() && month == date.getMonth() && day == date.getDate()); function GetFullYear(y){return ((y<30 ? "20" : "19") + y)|0;} }};var Validation = { notNull: function($container, $element, content, errorMessage) { if (isNull(content)) { showErrorMessage($container, $element, errorMessage); return false; } return true; }, email: function($container, $element, content, errorMessage) { var reg = new RegExp(/^(\w)+(\.\w+)*@(\w)+((\.\w{2,3}){1,3})$/); if (!reg.test(content)) { showErrorMessage($container, $element, errorMessage); return false; } return true; }, serialNmuber: function($container, $element, content, errorMessage) { var reg = new RegExp(/^[0-9a-zA-Z_-]*$/); if (!reg.test(content)) { showErrorMessage($container, $element, errorMessage); return false; } return true; }, number: function($container, $element, content, errorMessage) { var reg = new RegExp(/^[0-9]*$/); if (!reg.test(content)) { showErrorMessage($container, $element, errorMessage); return false; } return true; }, humanName: function($container, $element, content, errorMessage) { var reg = new RegExp(/(^[A-Z a-z]*$)|(^[\u4e00-\u9fa5]*$)/); if (!reg.test(content)) { showErrorMessage($container, $element, errorMessage); return false; } return true; }, checkByRegExp: function($container, $element, regExp, content, errorMessage){ var reg = new RegExp(regExp); if (!reg.test(content)) { showErrorMessage($container, $element, errorMessage); return false; } return true; }};/** * 检查是否为空 */var isNull = function(item){ if(item == null || item == "" || item.replace(/(^\s*)|(\s*$)/g, "") == "" ){ return true; } return false;};/** * 显示提示信息 */var showErrorMessage = function($container, $element, content){ $element.popover({ content: content, trigger: 'manual', container: $container }).popover('show').on({ 'blur': function(){ $element.popover('destroy'); $element.parent().removeClass('has-error'); }, 'keydown': function(){ $element.popover('destroy'); $element.parent().removeClass('has-error'); } }).focus().parent().addClass('has-error');};

希望本文所述对大家学习有所帮助。