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WordPress Ajax API Example

[…] API provides the facilities to make this easy within WordPress, it helps to keep the three components mentioned above in mind. Once you’ve got them down, implementing Ajax in WordPress is more like a recipe than a problem to solve. It’s a three step process that can be implementeld the same way every time. A Practical Example Oftentimes, seeing a working example can be more effective than talking about code at some abstract level so I’ve written a small plugin that does the following: Introduces a checkbox above the Publish options in the WordPress dashboard. See above screenshot. When clicked, the author’s name and a link to contact the user will be rendered above the content on each post page. The plugin uses the author’s Display Name and Email Address as specified in the profile page. When the new option has been clicked, the final result will look like this: The traditional model for doing something like this is simple: Introduce a custom meta box Save the option when the user click’s Publish On the public-facing side of the theme, if the option has been set then render the data This particular example does not use Ajax and you can grab the 0.5 tag from GitHub. It includes all of the functionality above without the Ajax features. This version of the plugin lays the foundation for the Ajax work. JavaScript Handlers In order to implement Ajax, we basically want the same functionality above but without the user having the click on the Publish or the Update button under the Publishing options. Earlier, we mentioned that the first thing that we need to do is write some JavaScript to respond to the event when the user clicks on an element. In our case, we’re going to respond to when the user clicks on the checkbox. First, we need to make sure the checkbox has an ID that our JavaScript can use to access the element. Reviewing the post_author_credit_display() function, notice that it has already been provided: ID, ‘post_author_credit’, true ), 1, false ) . ‘ /> Next, we need to write a small bit of JavaScript to respond to when the user clicks on this element: (function($) { $(function() { /* TODO */ […]

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