By Adrian Kingsley-Hughes, Visit Amazon's Kathie Kingsley-Hughes Page, search results, Learn about Author Central, Kathie Kingsley-Hughes,
Explores the pc language's up to date gains whereas explaining find out how to upload JavaScript to present HTML websites and reviewing syntax, notation, conventions, variable manipulation, common sense statements, and item programming. advent. I. WELCOME TO JAVASCRIPT. 1. stepping into JavaScript! 2. Combining JavaScript and HTML. II. LANGUAGE travel. three. JavaScript in motion. four. dealing with information with Variables. five. Expressions, stipulations, Operators, and extra Strings and Numbers. 6. utilizing Statements in JavaScript. 7. Write larger JavaScript Scripts through the use of services and Evnts. eight. Getting the main Out of gadgets. nine. Bugs--How to discover Them and Kill Them. III. the place DOES JAVASCIPT pass? 10. Going past the field (or should still That Be Head?). IV. JAVASCIPT AND DYNAMIC HTML. eleven. Dynamic HTML and JavaScript. 12. Cascading type Sheets and JavaScript! thirteen. JavaScript and the record item version. 14. Examples, Examples, Examples! Index
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But more importantly, notice how they are displayed separately, instead of one on top of the other. What this shows is that the JavaScript stopped between each and didn’t just blindly run to the end of the script. It waited patiently until the user clicked OK on the first box before going on to display the second. TIP Remember to resave the file before viewing the changes you’ve made. You wouldn’t believe the number of users who forget this step and think they have done something wrong! EXERCISE As an exercise, go back to the template and, from scratch, create a new JavaScript to trigger an alert box with a message of your choice.
Objects, Methods, … and Even Properties One thing you’ve probably heard about JavaScript is that it is an objectoriented language. But what does this really mean? To understand this, you need to be familiar with three terms: • Objects • Methods • Properties What follows is a brief look at the three. After you have used JavaScript for a little while, you’ll find yourself using them a lot more, so we can leave the detailing of them until later. Objects Put simply, an object is a thing, anything. Just as things in the real world are objects (cars, dogs, dollar bills, and so on), things in the computer world are regarded as objects, too.
Cloaking device on! 8). 8: A confirm box complete with a custom message displayed by Internet Explorer. Now notice the buttons on the box—OK and Cancel. However, at the moment nothing happens when you click them except that the box disappears and the JavaScript continues to run again. Before you can use the buttons on the confirm box, you will need a few more JavaScript skills, after which you will revisit the confirm() method. EXERCISE Practice adding the confirm() method to a Web page. Add your own messages.