Some examples of ng directives in AngularJS are implemented in the React framework

ng-class: ng-class: ng-class: ng-class:

<i class="header-help-icon down" ng-class="{up:showMenu}"></i> 

Angularjs -class - ng- ng-class - Angularjs - ng-class

First set a variable in state such as isShowLoginMenu, change its value in different scenarios, and then bind to the class style

<i className={"header-help-icon down" + (this.state.isShowLoginMenu ? ' up' : '')}></i> 

or

 
<span id="vip-header-logo" className={'vip-logo icon-vip-v' + this.state.vipLevel}></span> 

With Angularjs we can do this:

<div class="logined" ng-show="isLogin"> Log on to the </div> 
<div class="logined" ng-if="isLogin"> hello {userName}</div> 
<div class="no-login" ng-hide="isLogin"> Not logged in </div> 

So how do we use React to achieve such a scenario?

React.createClass({ 
 getInitialState: function() { 
  return { 
   isLogin: true, 
   userName: 'Joe' 
  }; 
 }, 
 
 render: function() { 
   var isLogin = this.state.isShowLoginMenu, 
   loginHtml; 
 
   if (isLogin) { 
    loginHtml = 
     <div className="logined"> 
       Log in. Welcome {this.state.userName} 
     </div>; 
   } else { 
    loginHtml = 
     <div className="no-login"> 
       Not logged in  
     </div>; 
   } 
 
  return ( 
    <div className="user"> 
     {loginHtml} 
    </div> 
  ); 
 }