Using Converters $.ajax() converters support mapping data types to other data types. There are two ways which we can get the data out of this structure (assuming j is the structure): Our JavaScript is going to attach itself after the page is load, and fire an event each time the job function select box is changed. As of jQuery 1.5, jQuery's Ajax implementation includes prefilters, transports, and converters that allow you to extend Ajax with a great deal of flexibility. Below is an example of the category selection when submitting an item for sale on Ebay. If you're familiar with PHP or Perl, you can basically treat these as hashes. In this example, I will be sending an Ajax request to a PHP script, which will return a list of car models in a JSON format. //This will return the data that we can add to our Select element. To ensure accessibility, the server side will handle the pre-population of the select boxes as the page is loaded. The server-side code to produce the dynamic page (i.e. Update: due to popular demand, I've caved in, and written a plugin and demos with multiple-select boxes populating each other and driven from MySQL. When using ajax you want to remove all the other options so you can re-populate the select box with the new data.
If you want to study these concepts in depth, take a look at MDN.
How to see how many Snapchat friends you have. The top level category is the resource type, and the sub-category will list the individual's names. Each item in the JSON response is looped round and used to build up the new options for the select box. //Change the text of the default "loading" option. Now, let’s take a look at the JavaScript code that will send an Ajax request to our PHP script before populating the above SELECT element: In the example above, we wrapped our request inside the $(document).ready function. The result of which are converted to select options and the sub-category select's elements are replaced. After that, I will take the returned JSON data and append each array element to the SELECT dropdown. It should be a simple next step to integrate a database behind the selection methods and create more complicated selection like this Ebay example.
Change a SELECT element using JavaScript. The first line establishes the database connection, followed by a select query to return the values from a table. You may want to change this to suit your scenario. I'm a JavaScript developer working professionally on the web since 1999. In this tutorial, I will be using the JQuery library. Within the array are three objects. to pre-load the select boxes when the user first visits). The result of which are converted to select options and the sub-category select's elements are replaced. There is a 'load sub-category' button the user can select to re-load the page.
Once the top level category select is changed, it sends an AJAX request for the sub-categories. Let’s first look at the PHP code to connect to the database and select the values from a table based on a GET parameter. This is a JavaScript tutorial on how to populate a SELECT element’s options with an Ajax request.
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