Home > Articles > Programming > Ajax

This chapter is from the book

Using the pageinit Event Instead of $(document).ready()

To use the pageinit event on your page, you have to take a slightly less dynamic and more planned approach to your code. There are a few different ways you can attach the pageinit event in your code. When using a version of jQuery Mobile prior to 1.1, you will be using jQuery 1.6.4, which means you use the .bind() function instead of the .on() function. When using jQuery Mobile 1.1+ you use the .on() function to bind the event.

The .on() function introduced in jQuery 1.7 is a unification of previous functions used to bind events. Instead of having to worry about using .bind(), .live(), or .delegate(), you can now use the .on() function to find events. More about this function can be found by visiting http://api.jquery.com/on/. If you are using a version of jQuery Mobile prior to 1.1, you should not use the .on() method, but should instead use the .delegate() or .live() function.

In Listing 4.6 the contents of multipage_one.html, which is the first page of a multipage site are shown. It includes a button that then loads a second page through AJAX.

Listing 4.6 A Page Containing the Setup for the pageinit Event

 1: <!DOCTYPE html>
 2: <html>
 3:   <head>
 4:     <title>Developing with jQuery Mobile</title>
 5:     <meta name="viewport" content="width=device-width, initial-scale=1">
 6:     <link rel="stylesheet" href="http://code.jquery.com/mobile/1.1.0/jquery.mobile-1.1.0.min.css" />
 7:     <script src="https://code.jquery.com/jquery-1.7.1.min.js"></script>
 8:     <script type="text/javascript">
 9:       $(document).on("mobileinit", function() {
 10:        $.extend( $.mobile , {
 11:          pageLoadErrorMessage: 'Either the page cannot be found or it cannot be loaded.'
 12:        });
 13:      });
 14:      $(document).on("pageinit","#pageinit2", function() {
 15:        alert("pageinit is bound!");
 16:      });
 17:    </script>
 18:    <script src="https://code.jquery.com/mobile/1.1.0/jquery.mobile-1.1.0.min.js"></script>
 19:  </head>
 20:  <body>
 21:    <div data-role="page">
 22:      <div data-role="header"><h1>pageinit event example</h1></div>
 23:       <div data-role="content">
 24:         <p>The button below will use AJAX to load another page and trigger a bound event</p>
 25:         <a href="multipage_two.html" data-role="button">Click to open a new page</a>
 26:       </div>
 27:     </div>
 28:   </body>
 29: </html>

Looking at the preceding code, do you see the .on() function and the pageinit event? Let’s walk through the code and I will explain what we have done and how it makes things work.

The beginning lines should seem familiar by now, so we’ll start at line 9. Line 9 uses $(document) as the selector, and then uses the .on() function to bind the mobileinit event to the current page. In comparison line 14 also uses the .on() function to bind the pageinit event. The binding takes place through the second parameter passed in the .on() function. The .on() function allows events to be delegated to elements that do not currently exist in the DOM, but that will exist in the future. This is why the pageinit event will be bound to the object that will have an id of pageinit2 once it is added to the DOM.

Continuing onto line 15 we can see that an alert() function is going to be called as soon as the page is initialized into the DOM. Line 16 then closes the .on() function.

Continuing onto line 18 we see the include for jQuery Mobile. Line 19 closes the head element. Line 20 starts the body element. Lines 21 through 27 make up the actual code that will be presented as a page to the user. Line 25 shows the setup for a button, and if you look closely you see that our button is set to link to another file instead of an anchor tag farther down the page. We cover multipage sites in Hour 7, “Learning About Page Layout.”

To finish out the file, lines 28 and 29 are closing tags for the body and html elements that complete our page.

We set up a function inside the pageinit event that triggers anytime a page with an id of pageinit2 is loaded. Even though we are binding the pageinit event on the first page, it will not run on there because it does not have an id of pageinit2.

Now let’s look at Listing 4.7, which shows the contents of multipage_two.html and is the second page that Listing 4.6 links to.

Listing 4.7 This Page Has an Event Tied to It That Will Trigger on Page Load

 1: <!DOCTYPE html>
 2: <html>
 3:   <head>
 4:     <title>Developing with jQuery Mobile</title>
 5:     <meta name="viewport" content="width=device-width, initial-scale=1">
 6:     <link rel="stylesheet" href="http://code.jquery.com/mobile/1.1.0-rc.1/jquery.mobile-1.1.0-rc.1.min.css"
 7:     <script src="https://code.jquery.com/jquery-1.7.1.min.js"></script>
 8:     <script src="https://code.jquery.com/mobile/1.1.0-rc.1/jquery.mobile-1.1.0-rc.1.min.js"> </script>
 9:   </head>
 10:  <body>
 11:    <div data-role="page" id="pageinit2">
 12:      <div data-role="header"><h1>pageinit event example </h1></div>
 13:      <div data-role="content">
 14:        <p>Fantastic! I am a new page and was loaded through AJAX.</p>
 15:        <a href="pageinit.html" data-role="button" data-rel="back"> Amazing, now take me back</a>
 16:      </div>
 17:    </div>
 18:  </body>

Look closely at the code for a minute and see if you can spot anything that would make it trigger an event when it loads.

A quick glance over lines 1 through 9 shows the typical setup of a mobile site. We can see the HTML5 DOCTYPE being used on line 1. The head element starts on line 3 and includes a title element set on line 4, the meta element set for mobile devices on line 5, the include for the jQuery Mobile style sheet on line 6, the include for the jQuery library on line 7, the include jQuery Mobile library on line 8, and the closing tag for the head element on line 9.

The only thing that appears different on this page from the page in Listing 4.6 is the lack of binding for both the mobileinit event and the pageinit event. Let’s keep looking down the code and see if we can see anything else.

Skipping over line 10, line 11 shows us setting up a div element with a data-role="page" attribute and an id="pageinit2". That is the line that contains the attribute that ties this whole thing together. The attribute is id="pageinit2". That is the id that we used for the .on() function to bind the pageinit event to. Since this page contains that particular id, as soon as it is loaded into the DOM it triggers the pageinit event and calls the alert function that we placed inside the event.

Continuing down the rest of the page, you can see the content section being created on line 13. We also added a button that allows us to link back to the first page being created on line 15. This button contains both a link back to the first page through the attribute href="pageinit.html" and an attribute of data-rel="back" that defaults to a sliding-back page transition to the first page. Lines 16 through 19 are closing tags for various HTML elements that complete our page.

The following figures show the use of the pageinit event. These figures were taken on an Android device running version 4.0.1. Depending on what browser and device you use, the alert message will appear styled differently. Figure 4.3 shows the page we built in Listing 4.6. Figure 4.4 shows the alert that is triggered by the function called in the pageinit event. Figure 4.5 shows the page that triggered the pageinit event and is the code from Listing 4.7.

Figure 4.3

Figure 4.3 When the button is pressed, the pageinit event will be called.

Figure 4.4

Figure 4.4 This alert message was triggered by the pageinit event.

Figure 4.5

Figure 4.5 This is the second page. It appears only after the code in the pageinit event has completed.

You can set up more pageinit events for other pages by using a unique id for each page you want like to attach the event to. By doing this you can trigger functions that you only want happening when certain pages load.

InformIT Promotional Mailings & Special Offers

I would like to receive exclusive offers and hear about products from InformIT and its family of brands. I can unsubscribe at any time.


Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information

To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.


Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites, develop new products and services, conduct educational research and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.


If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@informit.com.

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information

Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.


Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.


This site is not directed to children under the age of 13.


Pearson may send or direct marketing communications to users, provided that

  • Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
  • Such marketing is consistent with applicable law and Pearson's legal obligations.
  • Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
  • Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information

If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.


Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.informit.com/u.aspx.

Sale of Personal Information

Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents

California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure

Pearson may disclose personal information, as follows:

  • As required by law.
  • With the consent of the individual (or their parent, if the individual is a minor)
  • In response to a subpoena, court order or legal process, to the extent permitted or required by law
  • To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
  • In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
  • To investigate or address actual or suspected fraud or other illegal activities
  • To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
  • To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
  • To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.


This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact

Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice

We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020