I've this following JS code, it's working perfectly in the desktop but it's not working in the touch devices.
jQuery(document).ready(function(){
jQuery("#gallery_trigger").click(function () {
jQuery(".my-second-portfolio").trigger( "click");
});
});
From my analysis, I figured that following line of code is not working
jQuery(".my-second-portfolio").trigger( "click");
I understand that .trigger( "click"); is not appropriate for the touch devices, so could you please help me to work this code in all devices?
Try 'tap' or 'vclick'
http://api.jquerymobile.com/tap/
$(".my-second-portfolio").tap();
The first thing you learn in jQuery is to call code inside the $(document).ready() function so everything will execute as soon as the DOM is loaded. However, in jQuery Mobile, Ajax is used to load the contents of each page into the DOM as you navigate. Because of this $(document).ready() will trigger before your first page is loaded and every code intended for page manipulation will be executed after a page refresh. This can be a very subtle bug. On some systems it may appear that it works fine, but on others it may cause erratic, difficult to repeat weirdness to occur.
Classic jQuery syntax:
$(document).ready(function() {
});
To solve this problem (and trust me this is a problem) jQuery Mobile developers created page events. In a nutshell page events are events triggered in a particular point of page execution. One of those page events is a pageinit event and we can use it like this:
$(document).on('pageinit', function() {
});
To execute a code that will only available to the index page we could use this syntax:
$('#index').on('pageinit', function() {
});
There's also another special jQuery Mobile event and it is called mobileinit.When jQuery Mobile starts, it triggers a mobileinit event on the document object. To override default settings, bind them to mobileinit. One of a good examples of mobileinit usage is turning off ajax page loading, or changing default ajax loader behavior.
$(document).on("mobileinit", function(){
//apply overrides here
});
Or you could use something like this:
$('div:jqmData(url="index.html")').on('pageshow',function(){
// code to execute on that page
//$(this) works as expected - refers the page
});
You could try to use $('.my-second-portfolio')[0].click(); to simulate a mouse click on the actual DOM element (not the jQuery object), instead of using the .trigger() jQuery method.
Note: DOM Level 2 .click() doesn't work on some elements in Safari. You will need to use a workaround.
http://api.jquery.com/click/
Related
I've got a single html with 5 pages + navbar. To force a refresh of one page I use this:
$("#page3").on("pagecreate", function(e) {});
It works the first time, but I want it to update every time I visit the page. I know there is .trigger("create"), and "refresh", but I can't get it to work properly...
jQuery Mobile 1.4.0
You need to listen to pageContainer event in order to determine which page is active and accordingly run the functions you want.
The new events can't be attached to a specific page, unlike successor versions of jQuery Mobile. Once an event is occurred, retrieve ActivePage's ID.
$(document).on("pagecontainerbeforeshow", function (e, ui) {
var activePage = $.mobile.pageContainer.pagecontainer("getActivePage")[0].id;
if(activePage == "page3") {
doSomething();
}
});
Demo
I'm using phonegap (cordova 2.8), and android 4.2.1,
I use as frame works: knockout, & jquery mobile.
The app is based on http://propertycross.com/jquery-mobile/
I get the following funny behavior:
when clicking on a button that moves to another screen #2,
if there is a button in #2 screen at the same location,
then it get clicked as well...
The only solution I found is to wrap the code that change the screen with setTimeout:
setTimeout(function() {
application.navigateTo(viewModel);
},600);
This solve the problem but slow down the app...
This is actually unfortunate since the phonegap is already too slow...
Thanks.
There are two things you can do:
1) e.stopPropagation(), e.preventDefault()
phopkins describes this here:
jQuery mobile tap event triggered for twice
I'll elaborate, as this was a major issue for me. This applies to any of the tap, click, vclick and probably other events.
Your event functions should have stopPropogation() and preventDefault() called, like so:
$('#selector').tap(function(e) {
//your code here
e.stopPropagation();
e.preventDefault();
});
This helps, however, I found that you could still get the "phantom" click.
2) Bind the event to the page, not the button.
That way it's not bound to the next page.
For example, for a page with id='myPage' and a button with id='myBtn':
$('#myPage').on('tap', '#myBtn', function(e) {
//your code here
e.stopPropagation();
e.preventDefault();
});
We are developing a Cordova based Android application.
All HTML pages are local(in assets/www folder).
We load HTML pages using jquery mobile changePage method and register for events(button click events etc) in pageChange callback.
For android 2.3 and above this works fine, requested page is loaded and events(click events etc) are binded properly.
On Android 2.2 we are facing an issue, on changePage method call requested page is loaded but pageChange event is not fired(so click events are not binded properly).
Any idea what could be causing this?
Is there are issue with changePage on lower versions of android?
I don't know if pageChange event is working on an Android 2.2 but there are some easy workarounds.
Pageshow can be used instead. It is last event to trigger before pageChange triggers so it can also be used for event binding.
$(document).on('pagebeforeshow', '#index', function(){
});
One last thing, you don't need to wait for changePage to bind click events. You can use something called delegated event binding. For it to work it doesn't matter if object exists in DOM or not because event will be binded to the document. It will propagate to element only when such need exists, for example if object is clicked.
This is how you do delegated event binding:
$(document).on('click', '#elementID', function(){
});
I think it's high time you drop support to Android 2.2. Even PhoneGap officially deprecated the support to Android 2.2. Only less than 5% use Android 2.2 and below
In my experience I usually use pagecreate event to bind events for buttons etc. This event is fired once the page is created. Try the method below on Android 2.2 and see whether it helps you out.
You can do something as below
$(document).on('pagecreate', '#myPageID', function(){
//Registering button click
$('#myButton').bind('click',function(){
alert('button click');
});
});
I want to create a horizontal swiping effect using jQuery Mobile. After doing a little bit of research, I found out that ViewPager, which is generally found in the app details page of Android Market, does what I want. In the page specified the author describes it along with code in Android, but I wanted to know if there is an equivalent plug-in or feature in jQM.
I like SwipeJS, it's lightweight and I like the one-to-one slide factor it uses (when you slide your finger across the element, it moves at the same rate).
There is also iScroll 4 that works pretty well (it seems to be more difficult to setup than SwipeJS).
You can however utilize the built-in swipe events in jQuery Mobile. You can bind to the swipeleft or swiperight events for the data-role="page" element(s) and navigate the user to the correct page based on the current page:
$(document).delegate('#page-two', 'swipeleft', function () {
//next page
$.mobile.changePage($('#page-three'));
}).delegate('#page-two', 'swiperight', function () {
//prev page
$.mobile.changePage($('#page-one'), { reverse : true });
});
Here is a demo: http://jsfiddle.net/fFGvD/
Notice the { reverse : true } object being passed as the option object to the changePage() function so the animation will play in reverse.
I am using Prototype JavaScript library for creating dynamic drop-down menus. Before the page loads, there is no event attached to the select statements with id, id_bran and id_gen. As can be seen, the init_image is called when the page loads, and the onclick event is attached to those select statement.
This works fine in desktops where I can use a mouse to execute the click event. It however does not work in my Android and iPhone browsers. When the page loads, the init_image is called and the getval function is executed. Later however, when I make a selection in the dropdown menu, the onclick event does not call the getval function. So I am confident that the prototype library is working on my Android and iPhone as the ajax request is made on page load but it fails subsequently. What's going wrong here?
<!--
MY HTML body->onload
The init_image is called the first time when the page is loaded
-->
<body onLoad="init_image();">
//Javscript function called on page load
function init_image() {
getval();
//Assigning the event to id_gen and id_bran for mouse clicks
document.getElementById("id_gen").onclick = getsize;
document.getElementById("id_bran").onclick = getsize;
};
//Javascript function called on page load and during mouse click on the select
//statement with id = id_bran and id_gen
function getval() {
ur = 'szv/c1--'+$F('id_bran')+'/g1--'+$F('id_gen');
new Ajax.Request(ur,
{
method:'get',
onSuccess: function(transport){
var response = transport.responseText;
$('id_val').replace(response);
}
});
};
First of all, you're force-injecting events and the load event which may lead to potential cross-browser issues. If you're using prototype.js, rely on it's native methods which are cross-browser:
<script type="text/javascript">
document.observe("dom:loaded", function() {
.. your code here ..
});
</script>
Then again for properly localizing and observing the click events, instead of:
document.getElementById("id_gen").onclick = getsize;
Use something like:
$('id_gen').on('click', getsize(e).bindAsEventListener(this)); // for prototype 1.7 branch
Or:
$('id_gen').observe('click', getsize(e).bindAsEventListener(this)); // for prototype 1.6 branch
Also by setting passing the e variable there, your getsize() function will have the Event object there, so you could stop it's native behaviour (like leading to #):
function getsize(e) {
e.stop();
.. your code here ..
}
Additionally, it would be best and much less bloated if you lock your whole logic into class and create an object for it... but that's a whole different story... :)
prototype.js is a powerfull tool, but needs some care.
I would suggest you reading some basics on the framework and following the API documentation later on:
http://prototypejs.org/learn/
http://api.prototypejs.org/