Download Learn Javascript by Chuck Easttom PDF

By Chuck Easttom

This introductory name in JavaScript pursuits the most renowned programming languages for net improvement. The name has a distinct process, utilizing development blocks so readers have built an entire site by way of the tip of the name

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However, at some point you will want to review this chapter. Its contents explain the intricacies of how JavaScript works. Even if you skip this chapter, I recommend you come back to it when you have read the first 10 chapters of the book. Essential Tools HTML files are plain text files. Therefore, in order to add JavaScript to an existing HTML document, you need a text editor. Notepad is an excellent choice for a simple text editor, if for no other reason than it’s free with Windows. Most operating systems including Windows, Macintosh, and Linux come with a free text editor.

You can use the following statement to ask the user for a number: var number = parseInt(prompt("Enter a number:", 0)) or var number = prompt("Enter a number:", 0) number = parseInt(number) The generic form of this function is prompt(message[, inputDefault]). You can see that this function works by using the typeof operator for testing: var number = prompt("Enter a number:", 0) alert(number, " is a ", typeof number) // "... is a string" number = parseInt(number) alert(number, " is a ", typeof number) // "...

Rather than a simple OK button, the confirm box includes both OK and Cancel buttons. Like the alert box, confirm is also a method of the window object. This method returns a Boolean value, because there are two options. You can use confirmation boxes to ask the user a yes-or-no question, or to confirm an action. ") reply is assigned a true value if the user chooses OK, and false if the user selects Cancel. The generic form of this function is confirm(message). Prompt Boxes var name = prompt("Enter your name:", "anonymous") The method returns a value of null if the user chooses Cancel.

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