The **jQuery Ajax feature** allows users to use Ajax on their HTML page by synchronously fetching their content from the server. 

# Fail function
The **fail function** is called whenever the initial function fails. It allows users to conduct a series of commands or errors that are shown. The syntax for fail is as follows:

>**jqXHR.fail(function( jqXHR, textStatus, errorThrown ) {});**

where:
* `function( jqXHR, textStatus, errorThrown )`: calls a function within the code that carries out the next set of commands.

>You may also add an array of functions that can be called. Such arrays are executed in the order in which they are added. 

Below is an example that shows how the fail function can be used to fetch data from the server when the program fails:

<html>
 <head>
    <script src="jquery-3.5.1.min.js"></script>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
 </head>
 <body>
   <div id="content"> <button id= "btn1">Click </button> <div>
 </body>
</html>

$.get( "exam.php" )
  .done(function() {
    console.log( "$.get succeeded" );
  })
  .fail(function() {
    console.log( "$.get failed!" );
  });

codemirror

> You can open console by using:
Right-click -> Inspect -> Console 

The following output can be seen:

What is the Ajax fail function?

The jQuery Ajax feature allows users to use Ajax on their HTML page by synchronously fetching their content from the server. Fail function The fail function is called whenever the initial function fails. It allows users to conduct a series of commands or errors that are shown. The syntax for fail is as follows:  jqXHR.fail(function( jqXHR, textStatus, errorThrown ) {});  where:  function( jqXHR, textStatus, errorThrown ): calls a function within the code that carries out the next set of commands.   You may also add an array of functions that can be called. Such arrays are executed in the order in which they are added.  Below is an example that shows how the fail function can be used to fetch data from the server when the program fails: 