HTML DOM console.assert( ) Method
The console.assert() method in HTML is used to write a message for the 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 accepts two parameters as mentioned above and described below:
- expression: It is a Boolean expression that denotes the message or object to write to the console. It is a required parameter.
- message: It is a string or an object which denotes the message or object to write to the console. It is a required parameter.
Example 1: Below program illustrates the console.assert() method in HTML
HTML
<!DOCTYPE html> < html > < head > < title > DOM console.assert() Method </ title > < style > h1 { color: green; } </ style > </ head > < body > < h1 >w3wiki</ 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 > |
Output:
Example 2: Displaying an object while using the console.assert() method
HTML
<!DOCTYPE html> < html > < head > < title >DOM console.assert() Method</ title > < style > h1 { color: green; } </ style > </ head > < body > < h1 >w3wiki</ h1 > < h2 >DOM console.assert( ) Method</ h2 > < p > To view the message in the console press the F12 key on your keyboard. </ p > < script > let MyElement = { Product: "Coca Cola", Type: "Beverage" }; console.assert(document.getElementById("MyDemo"), MyElement); </ script > </ body > </ html > |
Output:
Supported Browsers: The browser is supported by the console.assert() method are listed below:
- Google Chrome 1 and above
- Firefox 28 and above
- Opera 11 and above
- Safari 4 and above
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