WordPress And Ajax

Monday, December 21st, 2009 at 9:43 pm

wordpress and ajax

Ajax Rating Script - PHP and MySQL

Introduction

Frequent visitors AJAX websites like Ajaxian, have seen already: ajax players score. They are flashy, animated, can be used to evaluate the content (usually without refreshing the page) and if I could, I would have present to their parents and marry them. Compared to the traditional classification system, as on IMDb, they incite people to click on them, which reduces the process Effective rating a single click.
In this tutorial, I show you how to create the JavaScript framework to display the rating widget animation and how connect to your database server using some of the most common frameworks out there. I clearly separate the pages creating JavaScript functions, and the server rating, to allow the script to be as flexible as possible and be easily integrated into your existing website.
This tutorial is not intended to present a finished script (although you could simply copy and paste the final result in your website and make it work without any problem), but rather to explain design and implementation process that let you create your own widgets if you need. Getting Started with HTML

What is

This is a rating bar script done with PHP and MySQL that allows users to rate things like can make all the web 2.0, and without refreshing the page. This is an important improvement to the previous version for now is discrete, meaning that if Javascript is off it will still work (although the page refreshes). You can also set the number of classification units to use (ie 4 stars, 5 stars, or stars of 10) in a base evaluator evaluator (see examples below or read the documentation). Some other changes were made and see the documentation for more details. Note that this script is not tied to any specific system (Like WordPress), so you should be able to adapt to your situation without too much trouble. What are you waiting for? Check the demos Ajax Rating.

It is very important that no line breaks in the code, because it would unnecessarily complicate the DOM tree. If you are not sure about what I just said, please read the W3Schools HTML DOM Tutorial for further reference, as we will access the DOM directly from within our JavaScript.
As you can see, the container div is quite easy to generate the server side language, requiring most of the time only one line:
printf ("% S", rating, category);

The "continue" key word in our JavaScript code, as in most other program languages, continues with the next iteration of the loop and prevents the execution of the rest of the code in this iteration. Read the rating value

Now that we have all the qualifications containers, we can start by reading the rank value written as text within the container div. To read this value, access to first child node of the container div, which is a textNode, and access your nodeValue, which returns the CDATA text in the case of text nodes. This is done by the following line:
var rating = ratings [i] firstChild.nodeValue.;

There is no elegant way to recover from that mistake, so I just decided to continue the next grade container and prevent the error happens on the backend server.
Now we need to loop over the number of stars that show and see what is the graphic image is displayed on the star. By using the HTML DOM createElement (), initialize a new image and gradually add the respective values to that element. Of course, the first thing we want is the image that is displayed: o could test the degree to current iteration value or could decrease the value rating in each iteration and the evidence against 1, 0.5 and 0. I decided to lower the rating on each iteration, which presents me with three simple cases to test: if the score is greater than or equal to 1, the star is "on" if the rating is exactly 0.5, the star is "half" of Otherwise, the star is "off". This results in the following code:
for (var j = 0, j {
var star = document.createElement ('img');
if (score> = 1)
{
star.setAttribute ('src', '/ images / stars / rating_on.gif.');
Note -;
}
else if (note == 0.5)
{
star.setAttribute ('src', '/ images / stars / rating_half.gif.');
Note = 0;
}
more
{
star.setAttribute ('src', '/ images / stars / rating_off.gif.');
}
ratings [i] appendChild (star).;
}

Conclusion

Our current JavaScript allows us to transform the specially marked in the qualification div animated widgets you can use in specialized frameworks to link to our backend server. HTML code is completely separated from the code JavaScript, leaving the user with a screen is not very elegant but still visually rated current in case javascript is disabled. I created a ZIP file with the current result, which contains an HTML file, a CSS file, JavaScript and archiving of images. Connect the flash to the server with different settings

By Please be sure to remove the "window.onload = init_rating," in line "script.js" file if you downloaded the zip file, since we are using specialized framework onload event ..
The following examples are just one example of how this task because it can be achieved with a variety of different frames of JavaScript. Not should be used as a reference framework which is higher as not all under the same route and has the same objectives. Before jumping to the conclusion, you should read more sources and also listen to each site. There are good reasons not to have the operator $ dojo some interesting points can be found here (in comments). When deciding which framework to choose, base your decision on their specific task and the framework that is more comfortable. The PHP engine

About the Author

I am Asif Khalyani. I am software Engineer. PHP and ajax free script download site phpasks. User can download ajax rating script

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