Default Form Values with jQuery
Here's a useful jQuery snippet that clears the default values of form fields on focus and refills them if no text is entered. It uses the attribute called defaultValue which stores the original value of a form field.
$(document).ready(function() { $('input[type=text]').focus(function() { if($(this).val() == $(this).attr('defaultValue')) { $(this).val(''); } }) .blur(function() { if($(this).val().length == 0) { $(this).val($(this).attr('defaultValue')); } }); });
For example, assume you have a field like this:
<input type="text" value="Search..." />When the page loads, the text field will have "Search..." filled in. When you focus on it, this text will disappear (assuming it hasn't already been edited by you). When you leave focus without typing anything, the text will reappear.
Degradable Tabs With jQuery UI
Creating tabbed content is easy with jQuery UI. Using a simple HTML layout and calling the tabs function is all it takes. Here, I'll show you how to make a degradable tabbed interface. That is, we'll make it so the page is still readable when JavaScript is disabled. This involves hiding and showing elements using JavaScript before enabling tabs.
See the live demo. Try turning off JavaScript to see how it degrades.
Data Storage with jQuery
The jQuery data functions provide a clean way to store information for any kind of use. You can assign any amount of data to an element on the page and access it later by referencing the element. Like everything in jQuery, this is very easy to use.
In the following examples, we will be using an element with the id db to store information about fruit.
Store something:
// Store the current fruit $("#db").data("fruit", "orange"); // Store an array of fruit info $("#db").data("orange", { type: "citrus", color: "orange" } );
Fetch something:
// Find out what the current fruit is var fruit = $("#db").data("fruit"); // orange // Get the type of the current fruit var type = $("#db").data("orange").type; // citrus
Remove something:
// Remove all fruit data $("#db").removeData("fruit").removeData("orange");
Add Records to a Queue with jQuery
This tutorial will explain how to make an animated "add to queue" type functionality with jQuery. Since it is hard to explain the results, check out the demo. First, I'll show how to create the actual effect, and then how to implement AJAX submission to a back-end script for database storage or some other processing.
Create a Slide-In Panel with jQuery
In this tutorial, I'll explain how to create a slide-in panel effect with jQuery. Basically, this means a hidden panel the slides into view when it is triggered by a button or other action. This is often used to display a contact form in a fun way, which is exactly what I am using it for on the new UltraMega website. As it turns out, this is very easy to do.
Saving Time With jQuery
jQuery is a popular JavaScript library that greatly simplifies developing advanced JavaScript applications. It is extremely powerful and lightweight at the same time. I've been using it for the first time on a current project, and I really like it.
jQuery supports all major browsers, has a small file size, and is used by major websites such as Google! Here is the description from their website:
"jQuery is a fast and concise JavaScript Library that simplifies HTML document traversing, event handling, animating, and Ajax interactions for rapid web development."
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