Question

我按照解决方案检查数据库中是否已存在用户名：本主题中定义的“angularjs: custom directive to check if a username exists”

在我的情况下，我想在用户想要更新他的数据时付诸实践;当用户想要更改其LASTNAME时，必须启动该脚本。

开头，脚本不应显示错误消息

此处我的控制器：

// MY DIRECTIVE FOR CHECKING IF THE USERNAME IS ALREADY USED
app.directive('usernameAvailable', function($timeout, $q, $http, ContactService) {
  return {
    restrict: 'AE',
    require: 'ngModel',
    link: function(scope, elm, attr, model) { 
        model.interation=0;
        model.$asyncValidators.usernameExists = function() {   
        name= elm.val();
        return ContactService.searchContactByName(name).success(function(contact){
          $timeout(function(){
            if(contact.length >0){
                model.$setValidity('usernameExists', contact); 
                //model.$setValidity('unique', false); // For validation criteria in the form
                scope.alreadyExist='true';
                scope.contacts = contact;           
            }else{
                model.$setValidity('usernameExists', contact); 
                //model.$setValidity('unique', true); // For validation criteria in the form
                scope.alreadyExist='false';             
                scope.contacts = null;          
            }

          }, 600);
        }); 

      };
    }
  } 
});


app.controller('ctrlEditContacts', function ($scope, $routeParams, ContactService){

    // LOAD DATA ABOUT THE USER
    ContactService.loadPersonById($routeParams.contactId).success(function(contact){
        $scope.contact.ID = contact[0].ID;  
        $scope.contact.LASTNAME = contact[0].LASTNAME;  
        $scope.contact.FIRSTNAME = contact[0].FIRSTNAME;            
    });

});

此处我的模板：

  <div class="panel-body">
    <form name="ContactForm" class="form-horizontal" role="form" novalidate ng-submit="submitForm(contact)">

      <div class="form-group">
        <label for="username" class="col-sm-2 control-label">Last Name *</label>
        <div class="col-sm-10">
            <input type="text" class="form-control"
            name="username" maxlength="100" placeholder="Enter Last Name"
            required
            ng-model="contact.LASTNAME"
            username-available
            ng-model-options="{ updateOn: 'blur' }">
            <div ng-if="ContactForm.$pending.usernameExists">checking....</div>

            <div ng-show="alreadyExist=='true'" class="alert alert-info" role="alert" style="margin-top:10px;">
              <span class="glyphicon glyphicon-alert" aria-hidden="true"></span>
              <span class="sr-only">Error:</span>
              Last Name already exists
             </div>

        </div>
      </div>

      <div class="form-group">
        <label for="txtFirstName" class="col-sm-2 control-label">First Name</label>
        <div class="col-sm-10">
          <input type="text" class="form-control" name="txtFirstName" maxlength="100" placeholder="Enter First Name" ng-model="contact.FIRSTNAME">
        </div>
      </div>

目前，该脚本正在运行。加载页面时，会正确检索和显示有关用户的数据。但脚本同样加载，并显示消息“姓氏已存在”。所以我想避免这种情况，只有在更新（并且已经使用）姓氏的值时才会显示此消息。

你能告诉我如何更新脚本（我想要的指令）吗？

提前感谢您的帮助。

检索AngularsJS和Directive中的数据以检查用户名是否存在

0 个答案: