I am a newbie to JQM (I use 1.4.5) and my webapp (asp.net C# apache Cordova) contains many separate pages of .cshtml (single-page template) only. I am testing my webapp on a Samsung Galaxy Grand using Android 4.2.2
A.
I am not sure about my understanding of 'linking pages', even after reading all the JQM docs on this and also after reading up many, many posts on this topic about passing querystring values to another page; mainly because I find that ALMOST ALL the examples are directed towards providing answers for internal pages (Multi-Page template) within a single html page.
So I request some of you JQM experts to confirm or correct the following understanding of mine....
From the JQM docs I understood that
I could use in any link (e.g button), href="page2.cshtml?par1=1&par2=2"; and JQM will automatically use Ajax for this link to work.
I also understood that use of querystring is always allowed in such cases of different html pages of the same domain and it will work via Ajax automatically ; so long as the attr such as rel="external", data-ajax="false" etc. are not used in the same link.
but querystrings are not allowed in case of the internal pages (multi-page template) only....;
and if I need to use the above href to link to a page in another domain e.g. www.anotherdomain.com/page2.cshtml?par1=1&par2=2, then I need to use rel="external".
Are all my above points (that reflect my understanding) CORRECT? KIndly confirm ro please correct me ...
B.
In my app, I find that most of the links work according to my understanding as above, to connect to different pages in the same domain; and I assume it happens via Ajax. Is it correct? I am also able to use the querystring params in page2 ( i.e. To-Page).
But in one case, though it works, in the To-Page the Panel features do not operate correctly, unless I introduce rel="external' in the href link !!! I suppose it means it IS NOT AJAX anymore? Also I am unable to find the reason..
Further independent of the above topic, I face another issue. The loading time (i.e. Time taken to display the To-Page) varies.
Mostly it is OK, but at times the loading-circle goes on forever.... and I presume it has crashed....??? then If I go back using the back button and come forward again, many times it loads immediately...!!!!!
Any thoughts or suggestions.....?
Thanks in anticipation...
Ratna
Before you can worry about how to pass attributes from one page to another you need to understand the difference between multi-page and multi-HTML templates.
Multi HTML page template
Smaller and lighter, each data-role=”page” is inside a separate HTML file and page structure is much more modular.
Can become even smaller if every subsequent HTML page is stripped from HEAD content, or anything that isn’t data-role=”page” div. Unfortunately in this case fallback if JavaScript is not supported is out of question.
DOM size is relatively small, only first page is permanently loaded into the DOM, any other page will also be loaded into the DOM but at the same time it will also be removed when not used actively, basically each time you move from it.
Better fallback if JavaScript is not supported. Works great in desktop browsers after a page refresh, mainly because every HTML page has an existing HEAD content. This also allows your app to behave like normal web app mainly because AJAX can be turned off.
Multipage template
Since all pages are already loaded, no additional requests are generated for navigating between pages.
First load is slower as the file size is larger, but subsequent page navigation is fast, thus making transitions much more smooth. Almost native-like smooth, emphasize on almost.
Suitable for relatively smaller applications and situations where you know the capabilities of your target platforms including presence of JavaScript support, thus making it a great solution for a hybrid app. It works much better as a Phonegap app then multi HTML template.
The “page” data-role element is required.
More about this topic can be found here: Multipage template vs Multi HTML template in jQuery Mobile
Now let's talk about how to properly pass data between jQuery Mobile pages.
jQuery Mobile uses AJAX by default
You can turn off AJAX using rel="external"
If you turn off AJAX you will lose almost everything good about jQuery Mobile, including animations. So if you don't want AJAX page handling better find some other responsive framework like Bootstrap or Foundation.
If you don't want to use AJAX you can still use querystrings but inside a href or via changePage function.
Better querystrings alternatives:
Global object.
If you're using AJAX you can simply use a global object(s) to store all of your data.
Something like this:
// Store object
var storeObject = {
parameter1: null,
parameter2 : null
}
Access data from the previous page
Again if you're using AJAX you don't need to pass any data because all that data is till in the DOM.
// Store object
$(document).on('pagebeforeshow', '#second', function(e, data){
alert("My name is " + data.prevPage.find('#test-input').val());
});
Localstorage or Sessionstorage
This solution will work no matter if you use AJAX or not.
$(document).on('pagebeforeshow', '#index', function(){
$(document).on('click', '#change-page-button', function(){
// store some data
if(typeof(Storage)!=="undefined") {
localStorage.firstname="Dragan";
localStorage.lastname="Gaic";
}
// Change page
$.mobile.changePage("#second");
});
});
$(document).on('pagebeforeshow', '#second', function(){
alert('My name is ' + localStorage.firstname + ' ' + localStorage.lastname);
// Lets change localStorage data before we go to the next page
localStorage.firstname="NewFirstNeme";
localStorage.lastname="NewLastName";
});
$(document).on('pagebeforeshow', '#third', function(){
alert('My name is ' + localStorage.firstname + ' ' + localStorage.lastname);
});
Send data through changePage function or via href
// Send
$.mobile.changePage('page2.html', { dataUrl : "page2.html?paremeter=123", data : { 'paremeter' : '123' }, reloadPage : true, changeHash : true});
or
Send parameter
receive that same data:
$(document).on('pagebeforeshow', "#index", function (event, data) {
var parameters = $(this).data("url").split("?")[1];;
parameter = parameters.replace("parameter=","");
alert(parameter);
});
If you need more information about this solutions including working examples find them here: Passing data between jQuery Mobile pages
Several methods mentioned here are deprecated (still usable) in the version 1.4. Though you don't need to worry about that, almost everything here will be unusable in version 1.5. This new version will overhaul jQuery Mobile from the bottom to the top.
Update
Yes, you can use any such link and jQuery Mobile will use AJAX. If you take a look at my previous examples you will find a working one.
If you want AJAX you CAN'T use rel="external", data-ajax="false" though stringquerys will work in bot cases.
Correct they will only work in multi-HTML template. Though there used to be a 3rd party plugin that allowed this to work with multi-page template but I don't think it works with newer jQuery Mobile versions.
Correct, if you want to link external page you need to use rel="external".
Related
For my Jekyll-created web site, hosted on github, I'd like to use different CSS locally vs published.
Specifically, when I access it via http://localhost:4000/blah-blah, I'd like some extra page elements to be visible, and when I access it via http://mysite.github.io I want those extra elements to be invisible.
I want to add things like an "Edit Me" button to load the page with http://localhost:4000/admin.
I don't think I can do this with liquid, because the variables are processed at build-time, and I need different values at view-time.
How can I make my Jekyll-built site load different CSS based on the base URL (or hide/show page elements based on the base URL)?
You could do this with JavaScript. You could use document.domain to get the domain you are in.
var localsite = "localhost:4000/blah-blah";
var livesite = "mysite.github.io";
var domain = document.domain;
if(domain == localsite){
// display edit button
}
Something like that might work. I'm no expert at Jekyll (yet). There might be some code in jekyll that will help you do this differently and better. You may want to spend some time in the Jekyll docs first.
I would like to build the equivalent of a _layouts.cshtml page that I can use with every page in my web app. I don't want to use cshtml or razor though I want to use html. Is there a simple way to convert the _layouts page to standard html and then include it with the other pages in the app?
I have inherited an app that uses cshtml, with a _layouts page for menus and some content styling used on each page. I can duplicate the content on every page, but would prefer to have a generic solution for it. The client does not want to use cshtml pages. Any java library, such as AngularJS that would provide tools is ok for me to use. I'm not a front-end guy and this is a relatively low budget operation where I'm working for free. TIA.
i'm not familiar with .cshtml but on an html page you could use an iframe and update the contents of the iframe with different pages as needed.
you could also get external html and put it on the current page using jquery's get().
// get the contents of 'test.html' and put it into the 'result' element
// on the current page.
$.get("ajax/test.html", function(data) {
$(".result" ).html( data );
alert("Load was performed.");
});
My supervisor just handed me a pile of JSON files from a freelancer which we are going to use to make multiple (similar) websites. Lucky me, I'll get to be the one updating the content and css for the different versions.
This is my first time working with JSON, so while I can't be sure that this is a poorly designed template, the fact that the css is very messy (in order to change the color of buttons throughout the site from yellow to orange, at least 15 different classes need to be adjusted, which seems to me to defeat the whole purpose of css...) doesn't give me hope.
I've brute-forced my way through the first two different sites, but since it looks like we'll be doing a lot more of them, I'm looking for ways to streamline the process (in particular making sure to change the content in all the places the content needs changing, which is a lot of files, with different content for different versions).
I'm personally old-school enough to like awk (well, that, and it's what I'm most used to programming in), so my backup plan is to just set up an awk/batch script or two which will take in a "these are the bits of info that go in these specific places" file and update all the relevant files. However, I'm sure there's a better way to do this, which is why I'm turning to y'all.
Is there anything that already exists for streamlining processes like these? Or a coding system/language that's well-suited to this project? A GUI which I can connect to bits of text that need changing?
Ideally, I'd like to set up something that even a monkey (or a non-caffeinated me) could use as often as needed. I'm already going to have to dive into the source code to clean it up (because, gasp, we might need to be able to have more than 5 people on the "our team" page, for example - without bad css/html workarounds), so making other tweaks that'll help with the content update process can happen en route.
I have recently used underscore to render templates from JSON. this is a front end tool, but you could automate it with some backend tools (a simple cURL or file_get_content in php will do).
Here is a link to a tutorial
your template will be a JavaScript template in your html file:
<div id="rendered"></div>
<script type="text/template" class="template">
<%- rc.listTitle %>
</script>
and in your JavaScript code you load:
<script type="text/javascript">
// When rending an underscore template, we want top-level
// variables to be referenced as part of an object. For
// technical reasons (scope-chain search), this speeds up
// rendering; however, more importantly, this also allows our
// templates to look / feel more like our server-side
// templates that use the rc (Request Context / Colletion) in
// order to render their markup.
_.templateSettings.variable = "rc";
// Grab the HTML out of our template tag and pre-compile it.
var template = _.template(
$( "script.template" ).html()
);
// Define our render data (to be put into the "rc" variable).
var templateData = {
listTitle: "Olympic Volleyball Players",
};
// Render the underscore template and inject it after the div rendered
// in our current DOM.
$( "#rendered" ).after(
template( templateData )
);
</script>
I had read somewhere and have now forgotten that upgrading to the new asynchronous code will not enable one to track actual clicks for downloading items when user stays on the same page and that for tracking that you need to use the old version of GA code.
My question is, is that still the case and does anyone have any other reasons for not upgrading to use the newer asynchronous tracking?
thanks
Hmm...are you sure the "old" version of GA automatically tracked downloads? AFAIK GA never automatically tracked download links, that you always had to attach GA code (like a _trackEvent call) to your links yourself. But in any case, it's pretty easy to do it yourself, so it's really not a big deal. Plus, you get lots of benefits upgrading, and one day it may not even be an option to stick with the old version...
If you have jQuery you can for example do this:
// file types you want to consider a download
var downloadFileTypes = ['pdf','doc','docx','mp4'];
$(document).ready(function() {
$('a').filter(function() {
var ext = $(this).attr('href').split('.').pop().toLowerCase();
return ( $.inArray(ext, downloadFileTypes )>-1 );
})
.click(function() {
_gaq.push(['_trackEvent', 'Downloads', $(this).attr('href')]);
});
});
If you do not have a framework like jQuery, you can still do this easy enough with .getElementsByTagName() and using regular loops and conditions instead of the jQuery conveniences like .filter and .inArray
edit: Some things to note about that example:
the jQuery code was an example to hook the GA code to standard links pointing to the file types you specify in downloadFiletypes. It will only apply to links that exist at the time the code is executed. If you have links that may be dynamically generated on the page later, consider looking into .on() instead of .click()
you will need to make tweaks to matching links you want to consider downloads if they do not point to regular files with extensions. For instance, some websites have a controller script that expects a parameter with an ID and it dynamically serves up a pdf or whatever..if your files are like this, you will have to alter the logic to look for that instead.
I have a site which is using DNN (DotNetNuke) as a content management system. I am using another site for my event registrations. I have sent them my template; which displays the basics including a hover menu with many different items in it.
Issue is - as I update the menu on my site using DNN, I need it to be reflected on the site using my template - without me having to send them a new file. Anyone have suggetsions on how to approach this?
I don't want to send the events provider all of the DNN DLLs as well as my database login information in order to render the menu.
I created a page on my site that is something like 'menu.aspx' - this produces the menu in HTML format, however it has tags like in it that I'd like to remove before serving it to them.
What is the best approach for this? Do I need to write a custom server control using XMLHttp? Can I accomplish this in Javascript?
Any advice much appreciated.
Thank you!
If both sites are hosted on the same domain (eg site1.domain.com and site2.domain.com) you can use JavaScript and XmlHttpRequest to insert code from one site to another. Otherwise, the Same Origin Policy prevents you from using AJAX.
If they're not on the same domain but you have access to the page on their website, you can simply include there a JS script from your site :
<script type="text/javascript" src="http://yoursite.com/code.js"></script>
In the JS, simply document.write() what you want on the page. This way, you can easily change the content of the page on their site without having to send them a new file.
Finally, you can also use an iframe on their site, pointing to a page on yours.
EDIT: As Vincent E. pointed out, this will only work if they're on the same domain - my bad.
If you are unwilling or unable to use frames, then I would set up an ashx on your DNN server which renders the menu (if you've got it in a user control all the better, as you can just instatiate it and Render it directly to the output stream) and then just make an Ajax call to that from your events page and insert it directly into the DOM.
Here's a quick and hacky jquery-based example of the events page end of things:
<script type="text/javascript">
function RenderMenu(data)
{
$('#Menu').html(data);
}
$(document).ready(function() {
$.ajax({
type : 'GET',
url : 'http://localhost/AjaxHandlers/Menu.ashx',
data : '',
success : RenderMenu,
});
});
</script>
You'll want an empty div with the ID 'Menu' on the page where you want your menu to sit, but apart from that you're good to go.
If for whatever reason you can't get the menu HTML in an isolated way, then you'll need to do some text processing in RenderMenu, but it's still do-able.
I am not a web expert, so don't shoot me.
Can't you just put their registration form into an iFrame in DNN ?