I have used $.mobile.changepage to do the redirect in my phonegap+jquerymobile projects. However what makes me confused is that I need to put the script of all the pages to the same file index.html. If not, the redirect page can not execute the function in its header.
for example, my index.html seem to be
$(document).bind("deviceready",function(){$.mobile.changepage("test.html");})
then, my device will redirect to test.html which seem to be
$("#btnTest").click(function(){alert("123");})
<button id="btnTest">Test</button>
However, the script will never execute in test.html. Then I put the script to index.html, what I expect to be is done. Whatever, if I put all the script to the same page, the project will become harder and harder to be preserved. Appreciated for your help.
Intro
This article can also be found HERE as a part of my blog.
How jQuery Mobile handles page changes
To understand this situation you need to understand how jQuery Mobile works. It uses ajax to load other pages.
First page is loaded normally. Its HEAD and BODY is loaded into the DOM, and they are there to await other content. When second page is loaded, only its BODY content is loaded into the DOM. To be more precise, even BODY is not fully loaded. Only first div with an attribute data-role="page" will be loaded, everything else is going to be discarded. Even if you have more pages inside a BODY only first one is going to be loaded. This rule only applies to subsequent pages, if you have more pages in an initial HTML all of them will be loaded.
That's why your button is show successfully but click event is not working. Same click event whose parent HEAD was disregarded during the page transition.
Here's an official documentation: http://jquerymobile.com/demos/1.2.0/docs/pages/page-links.html
Unfortunately you are not going to find this described in their documentation. Ether they think this is a common knowledge or they forgot to describe this like my other topics. (jQuery Mobile documentation is big but lacking many things).
Solution 1
In your second page, and every other page, move your SCRIPT tag into the BODY content, like this:
<body>
<div data-role="page">
// And rest of your HTML content
<script>
// Your javascript will go here
</script>
</div>
</body>
This is a quick solution but still an ugly one.
Working example can be found in my other answer here: Pageshow not triggered after changepage
Another working example: Page loaded differently with jQuery-mobile transition
Solution 2
Move all of your javascript into the original first HTML. Collect everything and put it inside a single js file, into a HEAD. Initialize it after jQuery Mobile has been loaded.
<head>
<meta name="viewport" content="width=device-width; initial-scale=1.0; maximum-scale=1.0; minimum-scale=1.0; user-scalable=no; target-densityDpi=device-dpi"/>
<link rel="stylesheet" href="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.css" />
<script src="http://code.jquery.com/mobile/1.2.0/jquery.mobile-1.2.0.min.js"></script>
<script src="index.js"></script> // Put your code into a new file
</head>
In the end I will describe why this is a part of a good solution.
Solution 3
Use rel="external" in your buttons and every elements you are using to change page. Because of it ajax is not going to be used for page loading and your jQuery Mobile app will behave like a normal web application. Unfortunately this is not a good solution in your case. Phonegap should never work as a normal web app.
Next
Official documentation, look for a chapter: Linking without Ajax
Realistic solution
Realistic solution would use Solution 2. But unlike solution 2, I would use that same index.js file and initialize it inside a HEAD of every possible other page.
Now you can ask me WHY?
Phonegap like jQuery Mobile is buggy, and sooner or later there's going to be an error and your app will fail (including loaded DOM) if your every js content is inside a single HTML file. DOM could be erased and Phonegap will refresh your current page. If that page don't have javascript that it will not work until it is restarted.
Final words
This problem can be easily fixed with a good page architecture. If anyone is interested I have wrote an ARTICLE about good jQuery Mobile page architecture. In a nut shell I am discussing that knowledge of how jQuery Mobile works is the most important thing you need to know before you can successfully create you first app.
Unlike normal ordinary HTML pages, jQuery Mobile uses ajax technology when navigating between pages. So make sure to import all your JS files and libraries in all your html pages.
If you notice closely you will see that JS files from previous page is taken into consideration when loading the second page. But if you force rrefresh the current page then the js files of the current page will be effective.
So as I said earlier make sure to import the js files in all the html files.
Also no need to call deviceready, use following syntax to call your page specific js functions
$(document).on('pageshow', '#YourPageID', function(){
// Your code goes here
});
Jquery Mobile uses ajax to load a "page". A "page" here is a div with data-role=page. If you load a physical page index.html, you can navigate using changePage to any "page" div inside that page.
However, if you want to load a "page" from other physical page, jQM will only load the first "page" div from that page. What actually happen is you do not change page, jQM just load that particular "page" div using ajax and inject it to your current page.
You have two possible architecture where you put all your "pages" in a html page and navigate from there. Or you can have multiple page architecture. You can always mix this.
To physically change page, you need to add rel=external to your link.
Related
I have a bootstrap carousel on the homepage of my rails app which is hosted at Heroku. It works fine when the page initially loads. However, if I go to another page, then go back to the homepage, the carousel does not cycle unless I click on one of the left or right chevrons. I guess this is normal but how can I make the carousel cycle automatically when I link back to the homepage from within the app. I am getting bootstrap via cdn:
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap-theme.min.css">
and javascript/jquery from:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"</script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
Please help.
Sounds like it could be due to using turbolinks. If you are, the easiest solution is to try disabling turbolinks and see if that fixes the problem.
If that solves it, the reason is that Bootstrap probably sets up it's carousels and other stuff on document ready, which fires only once per page load. Turbolinks makes it so going to another page doesn't trigger a full page load - it pulls the new content in via ajax, and so Bootstrap's javascript (which sets up the carousel) will not be executed when you come back to the home page from another page - even though it does load when you view the home page directly.
I've got a website that I'm converting into an app using JQM. I've read about Pages and how the DOM loads but I'm still uncertain how to architect the site.
The main page of the application is based on the Google Maps API which uses JS to load. There are 150+ target pages so I don't want them to load until the user taps the link. All of the target pages also require JS to initialize. When they return to the main page the cached state should be the default but I also need the option to run JS if the query string changes. Content doesn't change often so my preference would be to cache data once loaded but there would need to be some way to flush the cache.
I converted the site to JQM. The target page JS didn't run so I added rel='external' to the links. The JS now runs on the target but when I link back to the main page it reloads the page without running initializing the JS. The obvious solution would be to add rel="external" but then I'd be defeating all performance value. Any recommendations on how I should structure it?
Using rel=external your links will not be loaded with Ajax and you will lose animated page transitions. If you want to run some script when a page displays, use this page event:
$(document).on("pageshow", "#selector", function(event, ui) { /* your code */ });
This and other useful events are described in jQuery Mobile API Documentation.
For example, pagecreate (the now deprecated pageinit) is called once when the page initializes.
About getting query string parameters, see this answer.
I started working with JqueryMobile a little time ago and I'm trying to adapt my website for mobile devices.
I'm using ASP.NET Mvc and the structure of my page is this:
<!DOCTYPE html>
<html>
<head>
<title>#ViewBag.Title</title>
#Styles.Render("~/Content/css")
#Scripts.Render("~/bundles/jquery")
#Scripts.Render("~/bundles/jquerymobile")
#Scripts.Render("~/bundles/jqueryflexslider")
</head>
<body>
<div data-role="page" data-theme="a">
#RenderBody()
</div>
</body>
</html>
The thing is that inside my layout page I have a partial view with a simple jquery function that animate my menu, slideup/down on click. When I reaload the page it works fine, but when i hit the back button it simple doesn't work anymore, but if i hit refresh again voialaaa, it's works.
I read the jquery mobile documentation about "Scripts & styles in the head" and it says that
..The default behavior of the navigation system is to use that link's href to formulate an Ajax request (instead of allowing the browser's default link behavior of requesting that href with full page load). When that Ajax request goes out, the framework will receive its entire text content, but it will only inject the contents of the response's body element (or more specifically the data-role="page" element, if it's provided)
My question is how do i reload the content and get my scripts working (presuming that the problem is the reload thing) if not, someone could point me a direction or what is the best structure for this case?
I finally got it working!
My problem was that everytime I navigate from page to page, my <div id="page" data-role="page"> was duplicated. Since I got two pages on DOM and two IDS of the same menu, the click simple didn't work anymore. Once I add the data-ajax='false' on the links who were responsible for redirect me for another page, my page reloaded as usual and finally i got no more duplicated divs, IDS and everything runs flawless now.
JQuery Mobile uses AJAX navigation unless you tell it otherwise. The ASP.NET redirects have no problem to normal requests, but cause issues with AJAX. So the my answer is to turn off AJAX. For that, all you have to do is add the attribute data-ajax='false' to the tag.
In my case, an easy solution could be (as changing each Html.ActionLink/Url.Action is time consuming), adding this at the end of the _Layout.cshtml (just before closing of the 'body' tag).
$(document).on('pageinit', function() {
$('a').each(function() {
$(this).attr("data-ajax", "false");
});
});
That would be fine assuming you don't want jQuery mobile to use any Ajax with links too. I am happy to let it go ahead and use Ajax in most circumstances, so I only turn it off selectively where it can cause a problem.
I included an external javascript file on a jquery mobile page. The javascript file modifies some html and css snippet generated at the server. I've tried putting the jquery code that modifies the markup in the following jquery mobile events -
pageinit, pagecreate, pageshow, pagebeforecreate
But the script doesn't modify the loaded markup on page load, but on page refresh, it works perfectly. So I'm trying to find a way to make the modification take place before the page renders.
Any suggested will be gratefully valued.
I've solved my problem. I included all the external javascript and css files on the index page, and it worked well.
This is because jquery mobile loads subsequent pages through ajax, after loading the first page.
I have one larger .js file loaded in the head of the app. entry point (index.html) instead of loading page-specific scripts inside their data-role="page" div.
So i have all the page specific scripting in one js that is loaded once from the index.html which always remains in the DOM.
So for example i have handlers like:
$(document).on('pageshow', '#page_Albums', function()
{
// code for the albums.html page
});
..etc
This is my problem:
When you start navigating the app everything is okey until you hit f5 or browsers refresh button.
This so called full-refresh won't load my central js file, also the needed jquery-mobile resources from the head of index.html (js & css) are lost.
Due to this it's obvious where the problem lies. When i hit refresh from index.html then everything works fine.
How to fix this?
thx
On the navigation links try use data-ajax="false" it will re-command your js...
For example,
<a href="#xyz" data-ajax="false>Link</a>