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Getting and setting attributes [attr()]
In the previous chapter, we saw how easy it was to get and set text and HTML content from and to an element. Fortunately, changing one or more attributes of an element is just as easy. We use the attr() method for this, which in its simplest form takes one parameter: The name of the attribute we wish to get:
In this example, we get the value of the "href" attribute of our link and then show it to the user. To change an attribute, we simply specify an extra parameter:
This will change the link to point to the British version of Google. The attr() method can also take a map of name/value pairs, for setting multiple attributes at the same time. Here we set both the href and the title attributes simultaneously:
The attr() method also supports the special overload where the value parameter is instead a callback function, allowing you to access the index of the element selected as well as the existing attribute value. Here's an example of just that:
We simply change all the Google links to point to the Image search instead of the default page, by adding an extra parameter to the href attribute. In this example we don't really use the index parameter, but we could have if we needed it, to tell us which index in the list of elements selected we're currently dealing with.