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In this chapter I ve made plenty of tweaks to the image gallery. The markup is now tidier. I ve introduced some basic CSS. Most of all, I ve improved the JavaScript. Here are some of the main things I accomplished: Wherever possible, I ve tried to avoid making unwarranted assumptions in my code. I ve introduced lots of tests and checks. The JavaScript is more likely to degrade gracefully in unforeseen situations. I ve ensured the accessibility of the JavaScript by avoiding the onkeypress event handler. Perhaps most importantly of all, I ve moved the event handling from the markup to the JavaScript. This is unobtrusive JavaScript.
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Here s my final product after all of the tweaks I ve made through this chapter:
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CHAPTER 6 THE IMAGE GALLERY REVISITED
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And my mantra: the more separation there is between structure and behavior, the better. Something about the markup of the image gallery is still bothering me. I have two elements, placeholder and description, that exist solely for the showPic function to use. For visitors without JavaScript, these elements are, at best, meaningless. At worst, they could be downright confusing. Ideally, these elements should only appear in the document if the visitor has a DOM-capable browser. In the next chapter, I m going to show how you can use the DOM to create elements and insert them into your markup.
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Creating Markup on the Fly
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What this chapter covers: A quick look at the old-school techniques: document.write and innerHTML An in-depth look at the DOM methods createElement, createTextNode, appendChild, and insertBefore An introduction to Ajax and asynchronous requests
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Most of the DOM methods you ve seen so far are useful for identifying elements. Both getElementById and getElementsByTagName allow you to quickly and easily target specific element nodes in a document. These elements can then be manipulated using methods and properties like setAttribute (to change the value of an attribute) or nodeValue (to change the text contained by an element node). That s how the image gallery works. The showPic function identifies two elements, with the IDs "placeholder" and "description", and then updates their contents. The src attribute of the "placeholder" element is changed using setAttribute. The text within "description" is changed using nodeValue. In both cases, changes are being made to elements that already exist. This is the way that the majority of JavaScript functions work. The structure of the web page is created with markup. JavaScript is then used to change some of the details without altering the underlying structure. It is also possible to use JavaScript to change the structure and contents of a web page. In this chapter, you ll learn about some DOM methods that can alter the structure of a web page by creating new elements and modifying existing ones.
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Some old-school methods
Before we look at DOM methods for adding markup to a document in the web browser, let s briefly review a couple techniques that developers have used in the past: document.write and innerHTML.
document.write
The write method of the document object provides a quick and easy way to insert a string into a document. Let s see how this works. Save the following markup as a file. Call it something like test.html. <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8" /> <title>Test</title>
CHAPTER 7 CREATING MARKUP ON THE FLY
</head> <body> <script> document.write("<p>This is inserted.</p>"); </script> </body> </html> If you load test.html in a web browser, you will see a paragraph of text that reads This is inserted.
The major drawback to using document.write is that it goes against the principle of unobtrusive JavaScript. Even if you place the document.write statement in an external function, you ll still need to insert <script> tags into the body of your markup in order to call the function in the location where you want the write to occur. The following is a function that takes a string as its argument. This function concatenates an opening <p> tag, the string, and a closing </p> tag. This concatenated string is stored in a variable called str, which is then written out. function insertParagraph(text) { var str = "<p>"; str += text; str += "</p>"; document.write(str); } You can store this function in an external file called example.js. In order to call this function, you need to insert <script> tags into your markup: <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8" /> <title>Test</title> </script> </head> <body> <script src="example.js">
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