How many type of dialog boxes in JavaScript?

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Ravi Vishwakarma asked 8 days ago in Web Application by Ravi Vishwakarma

How many type of dialog boxes in JavaScript?    

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Ethan Karla answered 5 days ago by Ethan Karla
JavaScript supports three important types of dialog boxes. These dialog boxes can be used to raise and alert, or to get confirmation on any input or to have a kind of input from the users. Here we will discuss each dialog box one by one.
Alert Dialog Box
An alert dialog box is mostly used to give a warning message to the users. For example, if one input field requires to enter some text but the user does not provide any input, then as a part of validation, you can use an alert box to give a warning message.
Nonetheless, an alert box can still be used for friendlier messages. Alert box gives only one button 'OK' to select and proceed.
Example

window.alert('Hello, World!');
Confirmation Dialog Box
A confirmation dialog box is mostly used to take user's consent on any option. It displays a dialog box with two buttons: OK and Cancel.
If the user clicks on the OK button, the window method confirm() will return true. If the user clicks on the Cancel button, then confirm() returns false. You can use a confirmation dialog box as follows.
Example

 var val=window.confirm('Are you teenager?');
    if(val)
        console.log('Your age is < 18');
    else
        console.log('Your age is > 18');
Prompt Dialog Box
The prompt dialog box is very useful when you want to pop-up a text box to get user input. Thus, it enables you to interact with the user. The user needs to fill in the field and then click OK.
This dialog box is displayed using a method called prompt() which takes two parameters: (i) a label which you want to display in the text box and (ii) a default string to display in the text box.
This dialog box has two buttons: OK and Cancel. If the user clicks the OK button, the window method prompt() will return the entered value from the text box. If the user clicks the Cancel button, the window method prompt() returns null.
Example

var val=window.prompt('What is your name?');
    console.log(val);