HTML | DOM console.assert( ) Method
The console.assert() method in HTML is used to write a message for user on the console only if the expression evaluates to false. The expression and the message are sent as parameters to the console.assert() method.
Syntax:
console.assert( expression, message )
Parameters: This method accept two parameters as mentioned above and described below:
- expression: It is a Boolean expression which denotes the message or object to write to the console. It is required parameter.
- message : It is a string or an object which denotes the message or object to write to the console. It is required parameter.
Below program illustrates the console.assert() method in HTML:
Example 1:
<!DOCTYPE html> <html> <head> <title>DOM console.assert() Method</title> <style> h1 { color:green; } h2 { font-family: Impact; } body { text-align:center; } </style> </head> <body> <h1>GeeksforGeeks</h1> <h2>DOM console.assert() Method</h2> <p>To view the message in the console press the F12 key on your keyboard.</p> <script> console.assert(document.getElementById("MyElement"), "There is no element with the ID 'MyElement'"); </script> </body> </html> |
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Output:
See console view to press F12 Key:
Example 2: Displaying an object while using console.assert() method
<!DOCTYPE html> <html> <head> <title>DOM console.assert() Method</title> <style> h1 { color:green; } h2 { font-family: Impact; } body { text-align:center; } </style> </head> <body> <h1>GeeksforGeeks</h1> <h2>DOM console.assert( ) Method</h2> <p>To view the message in the console press the F12 key on your keyboard.</p> <script> var MyElement = { Product : "Coca Cola", Type : "Beverage" }; console.assert(document.getElementById("MyDemo"), MyElement); </script> </body> </html> |
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Output:
See console view on Pressing the F12 Key:
Supported Browsers: The browser supported by console.assert() method are listed below:
- Google Chrome
- Apple Safari
- Firefox 28.0
- Opera
- Internet Explorer
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