jQuery deferred.catch() Method

The deferred.catch() method in jQuery is used to add handlers which are to be called when the deferred object is rejected.

Syntax:

deferred.catch(failedFilter)

Parameters:

failedFilter: This parameter specifies a function which is to be called when the deferred object is rejected.

Return Value: This method returns the deferred object.

Example 1:

<!DOCTYPE HTML> 
<html> 
  
<head> 
    <script src= 
"https://code.jquery.com/jquery-3.5.0.js"> 
    </script> 
</head> 
  
<body style="text-align:center;"> 
    <h1 style="color:green;"> 
        w3wiki 
    </h1> 
  
    <p> 
        JQuery | deferred.catch() method 
    </p> 
      
    <button onclick="Beginner();"> 
        click here 
    </button> 
      
    <script> 
        function Beginner() { 
            $.get("testingGFG.php") 
                .then(function () { 
                    alert( 
            "$.get successfully completed!"); 
                }) 
                .catch(function () { 
                    alert("$.get failed!"); 
                }); 
        }  
    </script> 
</body> 
  
</html> 

Output:
Before clicking on button:

After clicking on button:

Example 2:

<!DOCTYPE HTML> 
<html> 
  
<head> 
    <script src= 
"https://code.jquery.com/jquery-3.5.0.js"> 
    </script> 
</head> 
  
<body style="text-align:center;"> 
    <h1 style="color:green;"> 
        w3wiki 
    </h1> 
  
    <p> 
        JQuery | deferred.catch() method 
    </p> 
      
    <button onclick="Beginner();"> 
        click here 
    </button> 
      
    <p id="GFG_DOWN"></p> 
  
    <script> 
        var el_down = document 
                .getElementById("GFG_DOWN"); 
        function Beginner() { 
            $.get("testingGFG.php") 
                .then(function () { 
                    el_down.innerHTML =  
                        "$.get successfully completed"; 
                }) 
                .catch(function () { 
                    el_down.innerHTML = "$.get failed!"; 
                }); 
        }  
    </script> 
</body> 
  
</html>  

Output:

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