Das Google Web Toolkit by Michael Seemann

By Michael Seemann

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These jQuery objects are very easy to work with when we want to actually do something with the things that we find on a page. We can easily bind events to these objects and add slick effects to them, as well as chain multiple modifications or effects together. Nevertheless, jQuery objects are different from regular DOM elements or node lists, and as such do not necessarily provide the same methods and properties for some tasks. In the final part of this chapter, therefore, we will look at ways to directly access the DOM elements that are wrapped in a jQuery object.

Styling links Let's say we want to have different styles for different types of links. henrylink { background-color: #fff; padding: 2px; border: 1px solid #000; } Then, we add the three classes—mailto, pdflink, and henrylink—to the appropriate links using jQuery. 3 Because of the rules defined in the page's stylesheet, an envelope image appears after all mailto: links on the page, as shown in the following screenshot: To add a class for all links to PDF files, we use the dollar sign rather than the caret symbol.

Info Selecting Elements For one final custom-selector touch, let's suppose for some reason we want to highlight any table cell that referred to one of the Henry plays. 8 So, now we can see our lovely striped table with the Henry plays prominently featured: It's important to note that the :contains() selector is case-sensitive. Using $('td:contains(henry)') instead, without the uppercase "H," would select no cells. Admittedly, there are ways to achieve the row striping and text highlighting without jQuery—or any client-side programming, for that matter.

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