React by Ben

JSX Expressions

JSX supports expression in pure JavaScript syntax. The expression has to be enclosed inside the curly braces, { }. The expression can contain all variables available in the context where the JSX is defined. Let us create simple JSX with expression.

Example

<script type="text/babel">
   var currentTime = new Date().toTimeString();
   ReactDOM.render(
      <div><p>The current time is {currentTime}</p></div>, 
      document.getElementById('app') );
</script>

Output
Here, cTime is used in the JSX using expression. The output of the above code is as follows,

15:57:48 GMT-0700 (Pacific Daylight Time)

One of the positive side effects of using an expression in JSX is that it prevents Injection attacks as it converts any string into an HTML-safe string.