Web Development Blog

by Ei Sabai Nyo

31 Jan, 2011

Top 10 jQuery Mobile Code Snippets that you need to know    

jQuery Mobile is a framework for mobile web apps and mobile websites with an aim to provide a unified user interface system across many mobile device platforms such iPhone, BlackBerry, Android and Windows Mobile. The framework is built on top of one of the most popular Javascript frameworks, jQuery.

Followings are some of the most useful code snippets that I’ve used in my recent web app developed using jQuery Mobile framework.

1. Disable truncation for list items and buttons

If your list item or button has a long text, it will be truncated automatically by jQuery Mobile. To disable this truncation, add “white-space: normal;” to the CSS selector in question.

For example, to disable truncation for buttons:

.ui-btn-text {
white-space: normal;
}

To disable truncation for list descriptions:

.ui-li-desc {
white-space: normal;
}

To enable truncation, set it to “white-space: nowrap;“.

2. Display a random background image on page load

jQuery Mobile has a number of page initialization events that you can use to trigger certain methods on page load. The following CSS + Javascript can be used to display a random background image every time a page is loaded.

CSS

.my-page  { background: transparent url(../images/bg.jpg) 0 0 no-repeat; }

.my-page.bg1 { background: transparent url(../images/bg-1.jpg) 0 0 no-repeat; }

.my-page.bg2 { background: transparent url(../images/bg-2.jpg) 0 0 no-repeat; }

.my-page.bg3 { background: transparent url(../images/bg-3.jpg) 0 0 no-repeat; }

Javascript

$('.my-page').live("pagecreate", function() {
	var randombg = Math.floor(Math.random()*4); // 0 to 3
	$('.my-page').removeClass().addClass('bg' + randombg);
});

3. Disable a button action

To disable a button action (for eg: from opening a page), add the following Javascript.

$('#home-button').button("disable");

And to re-enable it:

$('#home-button').button("enable");

4. Disable loading pop-up message

I find the loading pop-up message a bit annoying because it gets triggered everytime you load a different page. To disable this: add the following line of code into your JS file.

$.mobile.pageLoading(true);

By default, it is enabled like so:

$.mobile.pageLoading();

5. Create a custom theme

jQuery Mobile framework comes with 5 themes – Theme A, Theme B, Theme C, Theme D and Theme E. But you can easily create a new theme for your web app.

The steps to create a new theme:
1. Copy CSS for any theme from jQuery Mobile CSS file and paste it into your own CSS file.
2. Give your theme a name and rename the CSS selectors appropriately. Your theme name can be any alphabet character (a to z). So for example, if you copied Theme C, and you want to call your theme Theme Z, rename .ui-btn-up-c to .ui-btn-up-z, .ui-body-c to .ui-body-z and so on.
3. Change colors and styles of your custom theme
4. To apply your custom theme z to any element, just set the data-theme attribute to z. For example:

<div data-role="page" data-theme="z">

6. Use a custom font

There are a few font-replacement methods available such as cufon, sIFR, FLIR, @font-face and Google Fonts API. When building a web app using jQuery Mobile, I found that @font-face method is the easiest method to work with and the performance is quite satisfactory. If you are interested in @font-face, here is a helpful tutorial with a demo on how to work with @font-face method.

7. Create an image-only button with no text

Sometimes, you may not want to have any text for your button but still use the rest of the features that comes with a button element. This is usually the case with a home button or an info button. To hide any text associated with the button, set data-iconpos attribute to “notext”. For example:

<a href="../index.html" data-icon="grid" 
class="ui-btn-right" data-iconpos="notext">Home</a>

8. Open a link without using AJAX with page transitions

To open a link without using AJAX with page transitions (ie: reloading the full page the old-school way), set rel attribute to “external”.

<a href="../index.html" data-icon="grid" 
class="ui-btn-right" rel="external">Home</a>

9. Remove an arrow from a list item

By default, jQuery Mobile framework adds an arrow next to every list item. To disable this, set data-icon attribute to “false” on the list item that you’d like the arrow to be removed.

<li data-icon="false"><a href="contact.html">Contact Us</a></li>

10. Set background color of a page

This may sound simple but it took me a few minutes to figure out how to apply a background color to a page without having it overwritten by jQuery Mobile CSS. Normally, you’d set a background color to body element but if you are using jQuery Mobile framework, you need to set it to ui-page class.

.ui-page { 
background: #eee;
}

Recommended Books

jQuery Mobile

jQuery Mobile First Look

The following two books on HTML5 and jQuery will also help you understand and work with jQuery mobile framework better as jQuery mobile is based on jQuery and uses HTML5.

Love what you've just read? Subscribe to our newsletter to receive tips, resources and special offers related to web development & design.
Your name:   Your email:  

5 Responses to “Top 10 jQuery Mobile Code Snippets that you need to know”

  1. Ricardo says:

    Great article! Looking forward to do a web app using JQ Mobile, and these tips are quite useful, thanks!

  2. Benjamin says:

    Hey found this link off twitter and a better way to stop the loading screen from showing up is to include this snipit before you link to jquery mobile:

    $(document).bind(“mobileinit”, function() {
    $.extend( $.mobile , {
    loadingMessage: false
    });
    });

    Thanks for the random background thing too, it gave me a fantastic idea.

  3. Joed says:

    Just starting out with jquery, so your tips were very useful to me. Have bookmarked this page and will come back, many times no doubt.

  4. Thanks for the post, we are looking to do a Mobil app with JQ. This was very helpful.

  5. Thank you very much for this article. I’m a webdesigner and a complete newbie on JQuery Mobile. So, these tips were very helpful for me, too.

Profile PicHello! Welcome to Web development blog! My name is Ei Sabai and on this blog, I write about web development, mobile app development, latest web technologies and the likes. Read more about me or have a look at some of the tips & resources I've written.
Subscribe to our newsletter to receive tips, resources and special offers related to web development & design.
We do NOT spam.
Your name:  
Your email:  

Tips & Resources

Tips & Resources
WordPress Web Hosting
Recommended web hosting providers for WordPress 3.0
iPhone Native App Development
Important steps into iPhone app development for beginners
iPhone Web App Development
Tips for iPhone web app development
Coupons for Web Developers
Get discounts on web hosting, domain names, templates, etc
10 Useful jQuery Snippets
Easy-to-use jQuery snippets for any website
HTML Email Newsletter
Step-by-step tutorial on how to code an HTML email newsletter
  • bluehost Hosting $6.95/month
  • Joomla Templates

Recommended Book

Categories