Angular如何实现form自动布局

'use strict';
sxlcApp.controller('formlayoutCtrl', ['$scope', '$filter', '$http', function($scope, $filter, $http){
 $scope.title = "表单布局中";
 $scope.dataParamsUrl = './php/formlayout.json';
 
 $scope.resetForm = function(num){
  console.log(num)
 }
}]);

<div class="container" ng-controller="formlayoutCtrl">
 <span>{{title}}</span>
 <form class="form-horizontal" style="width: 400px;" name="formlayout" w5c-form-validate="validateOptions" novalidate>
  <form-layout url="dataParamsUrl">
    
  </form-layout>
  <button type="submit" class="btn btn-sm btn-info">
   提交
  </button>
  <button type="reset" class="btn btn-sm btn-danger" ng-click="resetForm()">
   重置
  </button>
 </form>
</div>

<div class="container" ng-controller="formlayoutCtrl">
 <span>{{title}}</span>
 <form class="form-horizontal" style="width: 400px;" name="formlayout" w5c-form-validate="validateOptions" novalidate>
  <form-layout url="dataParamsUrl">
    
  </form-layout>
  <button type="submit" class="btn btn-sm btn-info">
   提交
  </button>
  <button type="reset" class="btn btn-sm btn-danger" ng-click="resetForm()">
   重置
  </button>
 </form>
</div>

'use strict';
angular.module('form.layout', [])
/**
 * 定义布局的服务
 * @method
 * @param {Object} ) this.defaultTemplate [布局的模板]
 * @return {[type]}  [description]
 */
.provider('formLayout', function(){
 // 定义布局构造函数 
 function FormLayoutFn(){
  /**
   * 定义表单元素的模板
   * @type {{text: string, radio: string, checkbox: string, remember: string, range: string, time: string, date: string, datetime: string, search: string, select: string}}
   */
  this.elementTemplate = {
    text : '\<div class="form-group">\
       <label></label>\
       <input type="text" class="form-control" />\
      </div>',
    password : '<div class="form-group">\
        <label></label>\
        <input type="password" class="form-control" />\
       </div>',
    radio : '\<div class="form-group">\
        <label></label>\
        <div id="radiolist"></div>\
       </div>',
    email : '\<div class="form-group">\
       <label></label>\
       <input type="email" class="form-control" />\
      </div>',
    tel : '\<div class="form-group">\
       <label></label>\
       <input type="tel" class="form-control" />\
      </div>',
    url : '\<div class="form-group">\
       <label></label>\
       <input type="url" class="form-control" />\
      </div>',
    number : '\<div class="form-group">\
       <label></label>\
       <input type="number" class="form-control" />\
      </div>',
    checkbox : '<div class="form-group">\
        <label></label>\
        <div id="checkboxlist"></div>\
        </div>',
    range : '<div class="form-group">\
        <label></label>\
        <input type="range"/>\
       </div>',
    time : '<div class="form-group">\
        <label></label>\
        <input type="time" class="form-control"/>\
       </div>',
    date : '<div class="form-group">\
        <label></label>\
        <input type="date" class="form-control"/>\
       </div>',
    datetime : '<div class="form-group">\
        <label></label>\
        <input type="datetime" class="form-control"/>\
       </div>',
    search : '<div class="form-group">\
        <label></label>\
        <input type="search" class="form-control"/>\
       </div>',
    select : '<div class="form-group">\
        <label></label>\
        <select class="form-control"></select>\
       </div>',
    textarea : '<div class="form-group">\
        <label></label>\
        <textarea class="form-control"></textarea>\
       <div>',
   };
  //默认的模板, 可以使用如下的方式使用默认的模板
  this.defaultTemplate = '<input>';
  this.radioTmpl = '<label class="radio-inline"><input type="radio">radiotitle</label>';
  this.checkboxTmpl = '<label class="checkbox-inline"><input type="checkbox">checkboxtitle</label>';
 }
 
 FormLayoutFn.prototype = {
  /**
   * 获取模板
   * @method getElementTemplate
   * @return {[type]}   [description]
   */
  getElementTemplate : function () {
   return this.elementTemplate;
  },
 
  /**
   * 配置布局元素的模板
   * @param configTemplate
   */
  setElementTemplate : function(configTemplate){
   this.elementTemplate = angular.extend(this.elementTemplate, configTemplate);
  },
 
  /**
   * 实现布局函数
   * @method layout
   * @param {[type]} eleObj  指令中的模板对象
   * @param {[type]} elementObj 表单布局元素对象
   * @return {[type]}   [description]
   */
  layout : function(eleObj, elementObj){
   var thiz = this;
   var elementTemplate = this.elementTemplate;
   var defaultTemplate = this.defaultTemplate;
   var radioTmpl = this.radioTmpl;
   var checkboxTmpl = this.checkboxTmpl;
 
   if (angular.isObject(eleObj) && angular.isObject(elementObj)) {
    angular.forEach(elementObj, function(elementObjIterm, elementObjKey){
     //console.log(elementObjIterm.attr.type);
     var type = $.trim(elementObjIterm.attr.type);
     var templateObj = angular.element(elementTemplate[type]);
     // console.log(templateObj.find('input'));
     switch(type){
      case 'textarea' :
       var fileld = templateObj.find('textarea');
       // var templateObj = angular.element(elementTemplate.textarea);
       break;
      case 'select' :
       var fileld = templateObj.find('select');
       // var templateObj = angular.element(elementTemplate.select);
       break;
      case 'button' :
       var fileld = templateObj.find('button');
       // var templateObj = angular.element(elementTemplate.button);
       break;
      case 'datepicker' :
       var fileld = templateObj.find('datepicker');
       // var templateObj = angular.element(elementTemplate.datepicker);
       break;
      case 'radio' :
       var fileld = templateObj.find('#radiolist');
       // var templateObj = angular.element(elementTemplate.datepicker);
       break;
      case 'checkbox' :
       var fileld = templateObj.find('#checkboxlist');
       // var templateObj = angular.element(elementTemplate.datepicker);
       break;
      default :
       var fileld = templateObj.find('input') ;
       break;
     }
     // 设置 label 的标签名字
     templateObj.find('label').html(elementObjIterm.labeltext);
 
     if ('select' == type) {
      var options = elementObjIterm.attr.option;
      angular.forEach(options, function(content, val){
       var option = angular.element('<option value="'+val+'">'+content+'</option>');
       fileld.append(option);
      });
     }else if('radio' == type){
      var options = elementObjIterm.attr.option;
      angular.forEach(options, function(content, val){
       var tmpl = radioTmpl.replace('radiotitle', content);
       var tmplObj = angular.element(tmpl);
       tmplObj.find('input').attr('value', val);
       fileld.append(tmplObj);
      });
      // console.log(templateObj.find('label'));
     }else if('checkbox' == type){
      var options = elementObjIterm.attr.option;
      angular.forEach(options, function(content, val){
       var tmpl = checkboxTmpl.replace('checkboxtitle', content);
       var tmplObj = angular.element(tmpl);
       tmplObj.find('input').attr('value', val);
       fileld.append(tmplObj);
      });
     }else{
      angular.forEach(elementObjIterm.attr, function(val, attrname){
       fileld.attr(attrname, val);
      })
     }
      
     eleObj.append(templateObj.append(fileld));
    });
 
    return eleObj;
   }else{
    throw '传入的参数不是对象';
   }
    
  }
 
 };
 // 实例布局化构造类
 var formLayout = new FormLayoutFn();
 
 this.$get = function () {
  return formLayout;
 };
 //配置布局元素的模板
 this.setElementTemplate = function (configTemplate) {
  if (!configTemplate) return ;
  formLayout.setElementTemplate(configTemplate);
 }
});
/**
 * 指令的实现
 * @method
 * @return {[type]}    [description]
 */
angular.module('form.layout')
 .directive('formLayout', ['$http', '$filter', 'formLayout',function($http, $filter, formLayout){
  return {
   restrict : 'AE',
   scope  : {
    url : "=",
    // fields : {}
   },
   replace : true,
   // templateUrl : './tmpl/formlayout.html',
   transclude : true,
   // require : '?^formLayout',
   link : function(scope, elem, attrs){
    if(!scope.url){
     throw '请在指令参数url中传入获取数据的 url 的值';
    }
    $http.get(scope.url).success(function(successData, status, headers, config){
     if (!successData.code) {
      scope.fields = successData.data;
      processFormFilds(successData.data);
     }else{
      throw '获取表单数据失败';
     }
    })
 
    function processFormFilds(data){
     formLayout.layout(elem, data);
     // console.log(data);
    }
   }
  }
 }]);