RIOT.JS - Conditional

Conditionals are constructs which are used to show/hide elements of RIOT tags. Following are the three conditionals RIOT supports −

  • if − add/remove element based on value passed.

<custom2Tag>
   <h2 if = {showMessage}>Using if!</h2>
   <script>
      this.showMessage = true;      
   </script>
</custom2Tag>

  • show − shows an element using style = "display:' ' " if passed true.

<custom2Tag>
   <h2 show = {showMessage}>Using show!</h2>
   <script>
      this.showMessage = true;      
   </script>
</custom2Tag>

  • hide − hides an element using style = "display:'none' " if passed true.

<custom2Tag>
   <h2 show = {showMessage}>Using show!</h2>
   <script>
      this.showMessage = true;      
   </script>
</custom2Tag>

Example

Following is the complete example.

custom2Tag.tag

<custom2Tag>
   <h2 if = {showMessage}>Using if!</h2>
   <h2 if = {show}>Welcome!</h1>
   <h2 show = {showMessage}>Using show!</h2>
   <h2 hide = {show}>Using hide!</h2>
   <script>
      this.showMessage = true;
      this.show = false; 
   </script>
</custom2Tag>

custom2.htm

<!DOCTYPE html>
<html>
   <head>
      <script src = "https://cdnjs.cloudflare.com/ajax/libs/riot/3.13.2/riot+compiler.min.js"></script>
   </head>
   <body>
      <custom2Tag></custom2Tag>
      <script src = "custom2Tag.tag" type = "riot/tag"></script>
      <script>
         riot.mount("custom2Tag");
      </script>
   </body>
</html>

This will produce following result −

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