JavaScript Professional Projects by Paul Hatcher

By Paul Hatcher

JavaScript is a compact, object-based scripting language for constructing customer and server web purposes. It enables you to practice shape validation, structure textual content content material, and upload animation, sound results and Dynamic HTML to any website. JavaScript expert initiatives is aimed at the website developer who desires to create interactive, attractive websites. you'll how to write not just JavaScript which may stand by itself inside an online web page, but additionally find out how to write scripts that engage with functions written in different improvement languages. The initiatives offered inside this e-book will decrease the coding paintings and JavaScript studying curve via delivering the vast majority of JavaScript purposes you will have.

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Extra resources for JavaScript Professional Projects

Example text

Write( "

Row number " + n + "

" ); n++; } If you replace this code fragment for the script in the above example, you will get a randomly generated number of rows—anywhere from 1 to 21. Using do-while The do-while statement is very similar to the regular while statement. The condition in while loops is tested before the body of the loop is run. This means that it is possible for the loop not to run at all. The difference in the do-while loop is that the condition is tested after the loop body has run.

You can get or set the value of any element in an array simply by specifying its index. For example, an array declared as var theArray = new Array("January","February","March","April"); has a length of 4. The string "January" has an index of 0, "February" has an index of 1, "March" has an index of 2, and "April" has an index of 3. It is important to remember that arrays in JavaScript have a zero-based indexing system. In the previous array, referencing the element at index 4 will cause an error in your program.

This is another case in which not formatting your code correctly may confuse the reader. The JavaScript interpreter in your browser does not know that the else statement was supposed to go with the first if statement. All that the interpreter knows is that there is an if statement followed by another if statement and an else. Its natural response is to connect the else with the if statement that immediately preceded it. To avoid this problem, you will need to be more specific and use curly braces.

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