I'm using the jQuery Autocomplete control to autocomplete from the server via an AJAX call.
I implemented the search event to show a "Loading..." animation while results are being fetched from the server.
I want to disable that animation and show a message if fetching the autocomplete results from the server failed (timeout or whatever)
Whats the best way to do that?
Have a looksie at the jQuery.ajaxError method, which allows you to setup a default error callback for all ajax calls; http://api.jquery.com/ajaxError/
I just find myself in this situation. I wanted to clear the spinner from the textbox, and also highlight it in red, to provide visual feedback of the error. But I have 3 different textboxes in DOM that use the same function. So, you can do something like this:
function autocompleteSource(request,response){
//"this" is the widget object, you can get the element that called the autocomplete function from here
var callerTextbox = $(this.element);
$.get(url,data).done(/*do your stuff with the data*/).fail(function(){
highlight(callerTextbox) //That's my own function, uses jquery animation effects
response([]); //Use an empty response for clear the textbox
});
}
Related
I have an input field with Ajax functionality on a blur event and a commandButton on my page. If I modify a value on my input field and click the commandButton without tabbing out, which method will be called first? The listener attached to the input field or the button?
From my experience so far the one that is called first varies, which is causing some issues in my application. I would like the listener for the input field to always be called first.
Does anyone know how to handle this situation?
UPDATE:
Thanks for the responses and after troubleshooting a little more I noticed that as has been mentioned the ajax listener is called first but on rare occasions the button action is called before the listener method has finished processing some desired logic. In my case, I need the listener method to finish processing before the button action is called otherwise some unexpected behavior may occur. Is it possible to do this?
Remember that everything in JSF is converted back to HTML and JavaScript. Therefore a simple test as such :
<input type="text" id="field1" onblur="blurFunction();">
<br/>
<button onclick="clickFunction()">Click</button>
Will show you what you need to know. With the tests I have done, blur comes up first.
If you are having issues with this, why not have a simple check when clicking your button to make sure that whatever needed to run on blur was run?
Edit
As per the edited question, you could always set a flag on your blur event.
function blurFunction() {
document.myVar = 1;
//... rest of the function
}
function clickEvent() {
if(document.myVar = 1) {
//wait
} else {
//do your click event
}
}
It is not suggested to put your variable in the global scope. This is just but an example as to how this can be done.
I'm having a great time playing around with knockout js and have just started to get to grips with adding custom bindingHandlers.
I'm struggling a bit with the update function of a 3rd party jqWidget gauge - I can only get it to animate the first time I update the variable. On each update after that it just sets the value directly.
I don't fully understand ko.utils.registerEventHandler() and what it does although I've seen it in a bunch of other examples. Is this what is causing the animation to break? How do I know which events to register from the 3rd party widget?
For some reason this works fine if I add a jquery ui slider that is also bound to the observable.
You can test this here: set the value a few times to see that it animates the first time and not after that.
http://jsfiddle.net/LkqTU/4531/
When you update the input field, your observable will end up being a string. It looks like the gauge does not like to be updated with a string value, at least after the first time.
So, if you ensure that you are updating it with a number (parseInt, parseFloat, or just + depending on the situation), then it appears to update fine.
Something like:
update: function(element, valueAccessor) {
var gaugeval = parseInt(ko.utils.unwrapObservable(valueAccessor()), 10);
$(element).jqxGauge('value', gaugeval || 0);
}
http://jsfiddle.net/rniemeyer/LkqTU/4532/
You would generally only register event handlers in a scenario like this to react to changes made by a user where you would want to update your view model data. For example, if there was a way for a user to click on the gauge to change the value, then you would want to handle that event and update your view model value accordingly.
I'm answering the
I don't fully understand ko.utils.registerEventHandler() and what it does
part of your question.
registerEventHandler will register your event handler function in a cross-browser compatible way. If you are using jQuery, Knockout will use jQuery's bind function to register the event handler. Otherwise, will use the browser Web API with a consistent behavior across browsers.
You can check it out on the source code.
My specific usage case is that I'm using a .net postback to display an update panel of elements that have tooltips associated with them. I have already initialized the ZURB Foundation (provides tooltips) script on the page, and the first-page tooltips work great. After the postback, I want to *re*initialize the script so that these new tooltip items are bound to the 'hover' event.
Generic usage case is any situation where new tooltip-enabled elements are added in any way.
It appears to me that the 'hover' binding is done on page init to the existing collection of '.has-tip' elements, but there is handling of future .has-tip elements coming into existance.
I'd like to do the following:
a) Reinitialize the tooltip plugin and search for new .has-tip elements to attach the 'hover' event to.
have tried a number of different ways to try and reinitialize, but
$.fn.tooltips('init');
seems to be the most hopeful, in that it successfully calls the init method in the script, but does not bind the hover event to the new .has-tip elements.
Edit/Clarification:
it seems like there was a bug with dynamic content:
https://github.com/zurb/foundation/pull/465
When the bug is fixed
(you can fix it yourself, read the pull req. for more info), the bug is fixed, so you can
trigger a page-wide tool-tip refresh with:
$(document).tooltips('reload');
Original answer
If you didn't figure it out yet, jquery.tooltips.js has a method/function called .reload that actually seems to be the most promising (code is from the foundation plugin):
reload : function() {
var $self = $(this);
return ($self.data('tooltips')) ? $self.tooltips('destroy').tooltips('init') : $self.tooltips('init');
},
It's really just a chain of their other methods, but it's probably best to .destroy before .init to avoid double tooltips or some other collision.
I have tried a lot of suggestions, but what truly works is:
After you finish editing the DOM, you have to call to
$(document).foundation();
This sentence is going to refresh everything, including your tooltips. WORKS LIKE A CHARM.
I had the same problem when genereted modal windows with Ajax,
Here is my fix for that:
$(document)
.on('opened.fndtn.reveal', '[data-reveal]', function () {
$('html').css({'overflow': 'hidden'});
$('.has-tip').each(function(i){
var tip = $(this);
Foundation.libs.tooltip.create(tip);
});
})
It works for ZF v5.2+
I've just updated my project from jquerymobile 1.0a1 to version 1.0.
I've encountered a problem with dynamic content. Based on an ajax search I populate an unordered list with list items. Previous the following code refreshed the list so that all the styling appeared correctly:
$('#myContent').find("ul").listview();
$('#myContent').find("ul").listview('refresh');
However as of 1.0 this no longer seems to work.
The list appears but the styling is all wrong and the data-theme on all the elements gets ignored.
Has anyone come across a similar issue with updating and come across the solution.
Updating lists If you add items to a listview, you'll need to call the refresh() method on it to update the styles and create
any nested lists that are added. For example:
$('#mylist').listview('refresh');
Note that the refresh() method only affects new nodes appended to a
list. This is done for performance reasons. Any list items already
enhanced will be ignored by the refresh process. This means that if
you change the contents or attributes on an already enhanced list
item, these won't be reflected. If you want a list item to be updated,
replace it with fresh markup before calling refresh.
http://jquerymobile.com/demos/1.0/docs/lists/docs-lists.html
if #myContent is the listview you can do this:
$('#myContent').listview('refresh');
if #myContent is the page you can do something like this:
$('#myContent').trigger('create');
Create vs. refresh: An important distinction Note that there is an important difference between the create event and refresh method
that some widgets have. The create event is suited for enhancing raw
markup that contains one or more widgets. The refresh method should be
used on existing (already enhanced) widgets that have been manipulated
programmatically and need the UI be updated to match.
For example, if you had a page where you dynamically appended a new
unordered list with data-role=listview attribute after page creation,
triggering create on a parent element of that list would transform it
into a listview styled widget. If more list items were then
programmatically added, calling the listview’s refresh method would
update just those new list items to the enhanced state and leave the
existing list items untouched.
http://jquerymobile.com/demos/1.0/docs/pages/page-scripting.html
What you want can be achieved by replacing your 2 lines of code with the following:
$('#myContent ul').listview('create');
Hope this helps...
I've had this issue. The reason you are getting things all messed up is you are initalizing and refreshing the element multiple times. I noticed I had 2 different functions running that would call .listview('refresh') on the same element. After I took one out the themes and data went back to looking normal. Also are you getting any JS errors?
EDIT:
To be more specific you are calling .listview() somewhere in your code 2 times which is initializing it twice. I would wait to before you page is loaded to run the refresh so you only call it once.
Another thing you could do is check if the element is initialized already or not so you don't do it twice. Just check the element or in some cases the parent to see if the class ui-listview is present.
var element = $('#myContent').find('ul');
if ($(element).hasClass('ui-listview')) {
//Element is already initialized
$(element).listview('refresh');
} else {
//Element has not been initiliazed
$(element).listview().listview('refresh');
}
Just an FYI you can chain those events to look like $('#myContent').find('ul').listview().listview('refresh');
It cand be achived through.
$('#myContent').listview('refresh');
The below snippet shows you to load data from xml and dynamically create a list view.
function loadData()
{
$.ajax({
url:"BirthdayInvitations.xml",
dataType: "xml",
success: function(xml)
{
$(xml).find("event").each(function()
{
$("#mymenu").append('<li>' + this.textContent + ' </li>');
});
$("#mymenu").listview('refresh');
}
});
}
See if this is related to ur question http://www.amitpatil.me/demos/jquery-mobile-twitter-app/ and this one also http://www.amitpatil.me/demos/ipad-online-dictionary-app/
In first example i am using listview('refresh'); method and in second example i am using
$(document).page("destroy").page();
I am relatively new to jQuery and web development.
I am using jQuery UI Tabs to create tabs.
But I want the contents to be loaded only when I select a particular tab.
OK, I assume when the user clicks a tab, you intend to fetch content dynamically, via AJAX. This really involves two things, setting an onclick even for your tab and fetching the data via ajax.
Setting an onclick event
Give your tab an class, for example my_tab. Let's say that when the user clicks the tab you want the handle_tab_click() function to fire. Here's an example of binding the onclick event to your my_tab tab:
$(".my_tab").bind("click", handle_tab_click);
Your handle_tab_click() function will be given an event argument which will be able to provide you with information on the element that fired the event (in this case, the element with class name my_tab).
function (event) {
if ($(event.target).hasClass("my_tab")) { /* handle tab click */ }
if ($(event.target).hasClass("my_tab_2")) { /* a different tab click */ }
if ($(event.target).hasClass("my_tab_3")) { /* ... */ }
}
See the JQuery event documentation for more details here.
Fetching the data via ajax
Fetching data will require you to invoke a remote script while supplying information about which tab was clicked (in order to fetch the appropriate information). In the following snippet, we're invoking the remote script myscript.php, supplying the HTTP GET argument tab_clicked=my_tab and calling the function tab_fetch_cb when the script returns. The final parameter is the type of data being returned (it's up to you to choose).
$.get("myscript.php", {tab_clicked, "my_tab"}, tab_fetch_cb, "text/json/xml")
It's up to you to design myscript.php to handle the tab_clicked parameter, fetch the appropriate data and return it (i.e. write it back out to the client).
Here's an example for tab_fetch_cb:
function tab_fetch_cb(data, status) {
// populate your newly opened tab with information
// returned from myscript.php here
}
You can read more about the JQuery get function here, and JQuery ajax functions here
I'm sorry I can't be more specific in my examples, but a lot of the processing is really dependant on your task. As it looks as it has already been pointed out, you may look to some JQuery plugins for a canned solution to your problem. That being said, it never hurts to learn how to do this stuff manually w/ JQuery.
Good luck.
UI/Tabs support loading tab content on demand via Ajax, check this example.
Loading content via Ajax adds the complexity of dealing with bookmarking / browser back buttons. Depending on your situation, you should consider loading new content with a full page request. Handling the bookmarking/browser back involves using adding anchor info in the URL.
Also, check out LavaLamp for tab selection. It's pretty nifty looking.
By default a tab widget will swap between tabbed sections onClick, but the events can be changed to onHover through an option. Tab content can be loaded via Ajax by setting an href on a tab.
source: http://docs.jquery.com/UI/Tabs
If you're using Rails, you can try this gem bettertabs
It supports ajax tabs.