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CHAPTER 5 BEST PRACTICES
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Advertising pop-under windows and content overlays are the epitome of JavaScript abuse. Ostensibly, they are supposed to solve a problem: how to deliver advertising to users. In practice, they only increase user frustration. The onus was on the user to close these overlays and windows something that often turned into an unhappy game of whack-a-mole. If only someone had asked, How will this benefit the user Fortunately, this question is being asked more often these days. Any approach besides user-centric web design is, in the long term, doomed to failure. Whenever you are using JavaScript, you should ask yourself how it will affect the user s experience. There s another very important question you should also ask yourself: what if the user doesn t have JavaScript
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Graceful degradation
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It s always worth remembering that a visitor to your site might be using a browser that doesn t support JavaScript. Or maybe the user has disabled JavaScript (perhaps after being exposed to one too many pop-under windows). If you don t consider this possibility, you could inadvertently stop visitors from using your site. If you use JavaScript correctly, your site will still be navigable by users who don t have JavaScript. This is called graceful degradation. When a technology degrades gracefully, the functionality may be reduced, but it doesn t fail completely. Take the example of opening a link in a new window. Don t worry I m not talking about spawning a new window when the page loads. I m talking about creating a pop-up window when the user clicks a link. This can be quite a useful feature. Many e-commerce websites will have links to terms of service or delivery rates from within the checkout process. Rather than having the user leave the current screen, a pop-up window can display the relevant information without interrupting the shopping experience.
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Note Popping up a new window should be used only when it s absolutely required. There are accessibility issues involved, For example, some screen-reading software doesn t indicate that a new window has been opened. It s a good idea to make it clear in the link text that a new browser window will be opened.
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JavaScript uses the open() method of the window object to create new browser windows. This method takes three arguments: window.open(url,name,features) All of the arguments are optional: The first argument is the URL for the document you want to open in a new window. If this is missing, an empty browser window will be created. The second argument is the name that you can give this newly created window. You can use this name in your code to communicate with your new window. The final argument is a comma-separated list of features that you want your new window to have. These include the size of the window (width and height) and aspects of the browser chrome that you want to enable or disable (including toolbars, menu bar, location, and so on). You don t need to list all of the features (and anyway, it s a good idea not to disable too many features).
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This method is a good example of using the Browser Object Model. Nothing about the functionality affects the contents of the document (that s what the DOM is for). The method is purely concerned with the browsing environment (in this case, the window object). Here s an example of a typical function that uses window.open(): function popUp(winURL) { window.open(winURL,"popup","width=320,height=480"); } This will open up a new window (called "popup") that s 320 pixels wide by 480 pixels tall. Because we re setting the name of the window in the function, any time a new URL is passed to the function, the function will replace the existing spawned window rather than creating a second one. You can save this function in an external file and link to it from a <script> tag within the <head> of a web page. By itself, this function doesn t have any usability implications. What matters is how you use it. One way of calling the popUp function is to use what s known as a pseudo-protocol.
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