I wrote a jQuery plugin to filter select list options. It works great on one list, but not on more elements: http://jsfiddle.net/vgXPh/4/
$("select.filter").listFilter(); // doesn't work
$("select.filter:first").listFilter(); // works
I don't see any global variables that could be messing it up. Am I calling my bind events correctly? JSLint doesn't complain. What am I doing wrong?
You should probably surround your code with this.each(), like this:
$.fn.listFilter = function() {
this.each(function() {
(...)
});
return this;
};
Related
I'm triyng to build a simple animation jQuery-plugin. The main idea is to take an element and manipulate it in some way repeatedly in a fixed intervall which would be the fps of the animation.
I wanted to accomplish this through events. Instead of using loops like for() or while() I want to repeat certain actions through triggering events. The idea behind this: I eventualy want to be able to call multiple actions on certain events, like starting a second animation when the first is done, or even starting it when one animation-sequence is on a certain frame.
Now I tried the following (very simplified version of the plugin):
(function($) {
$.fn.animation = function() {
obj = this;
pause = 1000 / 12; //-> 12fps
function setup(o) {
o.doSomething().trigger('allSetUp');
}
function doStep(o, dt) {
o.doSomething().delay(dt).trigger('stepDone');
}
function sequenceFinished(o) {
o.trigger('startOver');
}
function checkProgress(o) {
o.on({
'allSetup': function(event) {
console.log(event); //check event
doStep(o, pause);
},
'stepDone': function(event) {
console.log(event); //check event
doStep(o, pause);
},
'startOver': function(event) {
console.log(event); //check event
resetAll(o);
}
});
}
function resetAll(o) {
/*<-
reset stuff here
->*/
//then start over again
setup(o);
}
return this.each(function() {
setup(obj);
checkProgress(obj);
});
};
})(jQuery);
Then i call the animation like this:
$(document).ready(function() {
$('#object').animation();
});
And then – nothing happens. No events get fired. My question: why? Is it not possible to use events like this inside of a jQuery plugin? Do I have to trigger them 'manualy' in $(document).ready() (what I would not prefer, because it would be a completely different thing – controling the animation from outside the plugin. Instead I would like to use the events inside the plugin to have a certain level of 'self-control' inside the plugin).
I feel like I'm missing some fundamental thing about custom events (note: I'm still quite new to this) and how to use them...
Thx for any help.
SOLUTION:
The event handling and triggering actually works, I just had to call the checkProgress function first:
Instead of
return this.each(function() {
setup(obj);
checkProgress(obj);
});
I had to do this:
return this.each(function() {
checkProgress(obj);
setup(obj);
});
So the event listening function has to be called before any event gets triggered, what of course makes perfect sense...
You need set event on your DOM model for instance:
$('#foo').bind('custom', function(event, param1, param2) {
alert('My trigger')
});
$('#foo').on('click', function(){ $(this).trigger('custom');});
You DOM element should know when he should fire your trigger.
Please note that in your plugin you don't call any internal function - ONLY DECLARATION
Using jQuery 1.7
I'm having trouble binding a Click event to some dynamically loaded content.
I've looked around, tried .live, .delegate and .on, and I just can't get it to work.
This is my code:
$(".fileexplorer_folderdlg").delegate(".delete", "click", function () {
console.log("Hello world!");
});
The thing is, .fileexplorer_folderdlg is dynamically loaded. If I use .fileexplorer (not dynamically loaded), it works, but I have more elements with the .delete class that I do not wish to bind to (and neither element classes can be renamed or changed for various reasons).
I also tried using .fileexplorer_folderdlg .delete as the .delegate selector, didnt work either!
Of course I could just add another unique class to the elements I wish to bind to, but this really should work, right?
I believe this would work:
$(document).on('click', '.delete', function() {
if ($(this).closest('.fileexplorer_folderdlg').length) {
console.log('hello, world!');
}
});
or even just:
$(document).on('click', '.fileexplorer_folderdlg .delete', function() {
console.log('hello, world!');
});
As you've found, you can't bind on .fileexplorer_folderdlg because it's dynamic. You therefore need to bind on some static element that will contain that element at some point in the future.
Instead, this binds on the document (but will unfortunately fire for every single click on the document thereafter).
EDIT by Jeff
Although the code above did not work, modifying it a bit did the job, although not the most desirable solution.
$(document).on('click', '.delete', function () {
if($(this).closest(".fileexplorer") != null)
console.log("Thanks for your help!");
});
It works, but this event is fired for all other .delete classes, of which there are many. What I do not understand though, is why using .fileexplorer_folderdlg .delete did not work!
Here's the scenario
$("p").live('customEvent', function (event, chkSomething){
//this particular custom event works with live
if(chkSomething){
doStuff();
// BUT only per element
// So almost like a .one(), but on an elemental basis, and .live()?
}
})
Here's some background
The custom event is from a plugin called inview
The actual issue is here http://syndex.me
In a nutshell, new tumblr posts are being infnitely scrolled via
javascript hack (the only one out there for tumblr fyi.)
The inview plugin listens for new posts to come into the viewport, if the top of an image is shown, it makes it visible.
It's kinda working, but if you check your console at http://.syndex.me check how often the event is being fired
Maybe i'm also being to fussy and this is ok? Please let me know your professional opinion. but ideally i'd like it to stop doing something i dont need anymore.
Some things I've tried that did not work:
stopPropagation
.die();
Some solutions via S.O. didnt work either eg In jQuery, is there any way to only bind a click once? or Using .one() with .live() jQuery
I'm pretty surprised as to why such an option isnt out there yet. Surely the .one() event is also needed for future elements too? #justsayin
Thanks.
Add a class to the element when the event happens, and only have the event happen on elements that don't have that class.
$("p:not(.nolive)").live(event,function(){
$(this).addClass("nolive");
dostuff();
});
Edit: Example from comments:
$("p").live(event,function(){
var $this = $(this);
if ($this.data("live")) {
return;
}
$this.data("live",true);
doStuff();
});
This one works (see fiddle):
jQuery(function($) {
$("p").live('customEvent', function(event, chkSomething) {
//this particular custom event works with live
if (chkSomething) {
doStuff();
// BUT only per element
// So almost like a .one(), but on an elemental basis, and .live()?
$(this).bind('customEvent', false);
}
});
function doStuff() {
window.alert('ran dostuff');
};
$('#content').append('<p>Here is a test</p>');
$('p').trigger('customEvent', {one: true});
$('p').trigger('customEvent', {one: true});
$('p').trigger('customEvent', {one: true});
});
This should also work for your needs, although it's not as pretty :)
$("p").live('customEvent', function (event, chkSomething){
//this particular custom event works with live
if(chkSomething && $(this).data('customEventRanAlready') != 1){
doStuff();
// BUT only per element
// So almost like a .one(), but on an elemental basis, and .live()?
$(this).data('customEventRanAlready', 1);
}
})
Like Kevin mentioned, you can accomplish this by manipulating the CSS selectors, but you actually don't have to use :not(). Here's an alternative method:
// Use an attribute selector like so. This will only select elements
// that have 'theImage' as their ONLY class. Adding another class to them
// will effectively disable the repeating calls from live()
$('div[class=theImage]').live('inview',function(event, visible, visiblePartX, visiblePartY) {
if (visiblePartY=="top") {
$(this).animate({ opacity: 1 });
$(this).addClass('nolive');
console.log("look just how many times this is firing")
}
});
I used the actual code from your site. Hope that was okay.
I'm trying to build a simple jquery plugin that can take selectors as parameters. All of the examples I find expect more raw 'properties' (width, color, etc) than actual selectors. Are there any good ways to do this?
I found this article : Passing jquery selector to sub-function within a plugin
But I'm still relatively confused.
The goal is kind of like this ...
(function ($) {
$.fn.demonstration = function (options) {
var defaults = {
$selector: null
};
var options = $.extend(defaults, options);
return this.each(function () {
alert($selector.attr('id'));
});
};
})(jQuery);
$('body').demonstration({ $selector: $('#canvas') });
A selector is nothing more than a string. As long as you wrap any access to a jQuery() ($) call, people can pass in pretty much anything (a selector string, a jQuery object, a DOM element, etc.)
Edit: Saw you added code, in this case you should access it by $(options.$selector).attr('id').
Out of curiosity, why the $ before selector?
I want to take advantage of the sortableRows property of the jqGrid. How do I detect when a row has been moved. I have studied the documentation and looked for examples but haven't found much. I do believe it is something like
jQuery("#grid").sortableRows({connectWith:'#gird',
ondrop: function(){ alert("row moved") }});
but that does not work. I can move the rows, but don't seemed to have trapped the event. Is there something wrong with my syntax or my approach in general.
Basically, I need to know that the rows have been rearranged so I can be sure they get saved with their new order.
Thanks
jqGrid uses the ui-sortable plugin to sort rows: http://jqueryui.com/demos/sortable/.
In
jQuery("#grid").sortableRows( options )
"options" is the passed to the sortable plugin.
options = { update : function(e,ui){} }
is what you want.
Attach the sortstop event handler to your grid:
jQuery("#grid").bind('sortstop', function(event, ui) { alert("row moved") });
I did a quick test and that worked for me.
jQuery('#'+grid_id).jqGrid('sortableRows', {
update: function (event, ui) {
var newOrder = $('#'+grid_id).jqGrid("getDataIDs");
//do whatever you want with new roworder
//please keep in mind this will give only page visible rows
}
});