W3Schools maintains a complete JavaScript reference, including all HTML and browser objects. The reference contains examples for all properties, methods and events, and is continuously …

A JavaScript function is defined with the function keyword, followed by a name, followed by parentheses (). Function names can contain letters, digits, underscores, and dollar signs …

Common uses for JavaScript are image manipulation, form validation, and dynamic changes of content. To select an HTML element, JavaScript most often uses the …

With the object model, JavaScript gets all the power it needs to create dynamic HTML: JavaScript can change all the HTML elements in the page; JavaScript can change all the HTML attributes …

How to use Expression 2. Expression 2 is used to evaluate the condition of the initial variable (i < len). But, expression 2 is also optional. If expression 2 returns true, the loop will start over …

In JavaScript we have the following conditional statements: Use if to specify a block of code to be executed, if a specified condition is true; Use else to specify a block of code to be executed, if …

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In JavaScript we have the following conditional statements: Use if to specify a block of code to be executed, if a specified condition is true; Use else to specify a block of code to be executed, if …

You should use objects when you want the element names to be strings (text). You should use arrays when you want the element names to be numbers.

Many different methods can be used to let JavaScript work with events: HTML event attributes can execute JavaScript code directly; HTML event attributes can call JavaScript functions; You …