Jquery not binding event onload - javascript

(function() {
var bgOn;
$(".ContainingBox").on('hover', function() {
function() {
bgOn = $(this).css("background-color");
$(this).css("background-color", "#e5fff8");
}, function() {
$(this).css("background-color", bgOn);
}
});
})();
I want to bind an event for hover. This code worked fine when I did not wrap it in the anonymous function, and used .hover() . However, we have a requirement to not use global variables. So i need to bind the event!
Is this not possible?

Your code has syntax errors, specifically on() does not accept multiple callbacks etc.
Also, there is no native hover event, you should use mouseenter and mouseleave instead
$(".ContainingBox").on({
mouseenter: function() {
$(this).data('bg', $(this).css("background-color"));
$(this).css("background-color", "#e5fff8");
},
mouseleave: function() {
$(this).css("background-color", $(this).data('bg'));
}
});
Using jQuery's data(), and not a single variable, will remember the background color for each element
FIDDLE

try this....
(function() {
var bgOn;
$(".ContainingBox").on('mouseover', function() {
function() {
bgOn = $(this).css("background-color");
$(this).css("background-color", "#e5fff8");
}, function() {
$(this).css("background-color", bgOn);
}
});
})();

Related

how to bind 2 events with JQuery's .on method

I have this code which is working great on already created divs
$('.MyDivs').click(function(){
$('#OtherDiv').css('display','block');
}).mouseleave(function(){
$('#OtherDiv').css({ display: 'none' });
});
but does not work on dynamically created new Divs. I know there is a .on method of Jquery for dynamically created divs but do not know how to bind 2 events with it. I tried something like this
$(document).on('click', '.MyDivs', function()
{
$('#OtherDiv').css('display','block');
}).mouseleave(function(){
$('#OtherDiv').css({ display: 'none' });
});
I also tried this
$(document).on('click', '.MyDivs', function()
{
$('#OtherDiv').css('display','block');
});
$(document).on('mouseleave', '.MyDivs', function()
{
$('#OtherDiv').css({ display: 'none' });
});
but does not work. How can I bind click and mouseleave methods with .on?
My Problem
I just want to show Otherdiv on click of any div which has .MyDivs class and hide Otherdiv when mouse leaves currently .MyDivs div
you can try this. This should work.
$(document).on({
mouseenter: function() {
// Handle mouseenter...
},
mouseleave: function() {
// Handle mouseleave...
},
click: function() {
// Handle click...
}
}, ".MyDivs");
You need to use on for each chain. This should work:
$(document).on('click', '.MyDivs', function() {
$('#OtherDiv').css('display','block');
}).on('mouseleave', '.MyDivs', function() {
$('#OtherDiv').css('display','none'});
});
Or you can bind both events and look for the event.type, then toggle the div depending on the result:
$(document).on('click mouseleave', '.MyDivs', function(e) {
$('#OtherDiv').toggle( e.type == 'click' );
});

Show/Hide after a div created dynamically

I use this code to show/display Edit link when mouse hovers over the start div. This div however can be created dynamically and when it's created the code below doesn't work.
$(".start").hover(
function() {
timeclock.utils.displayEdit(this)
},
function() {
timeclock.utils.hideEdit(this)
});
I tried the code below but it doesn't work and it looks wrong. How can I implement $(document).on('hover'.....) to hide/show the Edit link as shown above?
$(document).on("hover", ".start",
function() {
timeclock.utils.displayEdit(this)
},
function() {
timeclock.utils.hideEdit(this)
});
hover() is a shortcut for binding mouseenter and mouseout handlers. Your second example doesn't work because on() doesn't take two functions like that. You bind multiple handlers at once using delegated events like this:
$(document).on({
mouseenter: function () {
timeclock.utils.displayEdit(this);
},
mouseleave: function () {
timeclock.utils.hideEdit(this);
}
}, '.start');
Simple example: http://jsfiddle.net/TRcR9/
There are 2 errors in your code.
1. you should use $(this) instead of this. There is a different between this two.
2. you have to bind the hover again whenever a new div is created.
Your syntax is a little off. You can attach multiple event handlers simultaneously using a plain object.
$(document).on({
mouseenter: function(){
timeclock.utils.displayEdit(this);
},
mouseleave: function(){
timeclock.utils.hideEdit(this);
}
}, ".start");
I've created a Codepen example here: http://cdpn.io/dDewi
The syntax you have is a a little off. Here is a jsfiddle with a working example:
HTML:
<div id="container"></div>
CSS:
#edit { display: none; }
Javascript:
$(function() {
$(document).on(
{
mouseenter: function()
{
$('#edit').show();
},
mouseleave: function()
{
$('#edit').hide();
}
},
'.start'
);
$('#container').prepend('<div class="start">Mouse over me <a id="edit" href="#">edit</a></div>');
});

Jquery on hover not functioning

I'm changing my codes to be compatible with jQuery 1.8 and I'm stuck with this hover which doesn't work. When I used then same thing with a click it worked. Here is my code, can anyone tell me where I'm going wrong?
$(document).on('hover', '.top-level', function (event) {
$(this).find('.actionfcnt').show();
$(this).find('.dropfcnt').show();
}, function () {
$(this).find('.dropfcnt').hide('blind', function () {
$('.actionfcnt').hide();
});
});
Deprecated as of jQuery 1.8: The name "hover" used as a shorthand for the string "mouseenter mouseleave". It attaches a single event handler for those two events, and the handler must examine event.type to determine whether the event is mouseenter or mouseleave. Do not confuse the "hover" pseudo-event-name with the .hover() method, which accepts one or two functions.
Source: http://api.jquery.com/on/#additional-notes
That pretty much says it all, you cant use "hover" for that:
$(document).on('mouseenter','.top-level', function (event) {
$( this ).find('.actionfcnt').show();
$( this ).find('.dropfcnt').show();
}).on('mouseleave','.top-level', function(){
$( this ).find('.dropfcnt').hide('blind', function(){
$('.actionfcnt').hide();
});
});
there is no "hover" event.
there is .hover() function that takes 2 callbacks (as in your example).
Try:
$(".top-level").on({
mouseenter: function (event) {
$( this ).find('.actionfcnt').show();
$( this ).find('.dropfcnt').show();
},
mouseleave: function (event) {
$( this ).find('.dropfcnt').hide('blind', function(){
$('.actionfcnt').hide();
});
}
});
OR
$(".top_level").on("hover", function(event) {
if(event.type == "mouseenter") {
$( this ).find('.actionfcnt').show();
$( this ).find('.dropfcnt').show();
}
else if (event.type == "mouseleave") {
$( this ).find('.dropfcnt').hide('blind', function(){
$('.actionfcnt').hide();
});
}
});
.on function has only 3 parameters : http://api.jquery.com/on/
If you don't need your handlers be bound to dynamically added elements as well, then you may use the good old hover function with 2 event handlers.
$('.top-level').hover(function (event) {
$(this).find('.actionfcnt').show();
$(this).find('.dropfcnt').show();
}, function (event) {
$(this).find('.dropfcnt').hide('blind', function(){
$('.actionfcnt').hide();
});
});​
By the way, $(selector).hover(handlerIn, handlerOut) is shorthand for $(selector).mouseenter(handlerIn).mouseleave(handlerOut);.
If you need to, then use on for mouseenter and mouseleave events:
$(document).on('mouseenter', '.top-level', function (event) {
$(this).find('.actionfcnt').show();
$(this).find('.dropfcnt').show();
}).on('mouseleave', '.top-level', function (event) {
$(this).find('.dropfcnt').hide('blind', function(){
$('.actionfcnt').hide();
});
});​
Try
$('.top-level').hover(function (event) {
$( this ).find('.actionfcnt').show();
$( this ).find('.dropfcnt').show();
}, function(){
$( this ).find('.dropfcnt').hide('blind', function(){
$('.actionfcnt').hide();
});
});

JQuery .on() method with multiple event handlers to one selector

Trying to figure out how to use the Jquery .on() method with a specific selector that has multiple events associated with it. I was previously using the .live() method, but not quite sure how to accomplish the same feat with .on(). Please see my code below:
$("table.planning_grid td").live({
mouseenter:function(){
$(this).parent("tr").find("a.delete").show();
},
mouseleave:function(){
$(this).parent("tr").find("a.delete").hide();
},
click:function(){
//do something else.
}
});
I know I can assign the multiple events by calling:
$("table.planning_grid td").on({
mouseenter:function(){ //see above
},
mouseleave:function(){ //see above
}
click:function(){ //etc
}
});
But I believe the proper use of .on() would be like so:
$("table.planning_grid").on('mouseenter','td',function(){});
Is there a way to accomplish this? Or what is the best practice here? I tried the code below, but no dice.
$("table.planning_grid").on('td',{
mouseenter: function(){ /* event1 */ },
mouseleave: function(){ /* event2 */ },
click: function(){ /* event3 */ }
});
That's the other way around. You should write:
$("table.planning_grid").on({
mouseenter: function() {
// Handle mouseenter...
},
mouseleave: function() {
// Handle mouseleave...
},
click: function() {
// Handle click...
}
}, "td");
Also, if you had multiple event handlers attached to the same selector executing the same function, you could use
$('table.planning_grid').on('mouseenter mouseleave', function() {
//JS Code
});
If you want to use the same function on different events the following code block can be used
$('input').on('keyup blur focus', function () {
//function block
})
I learned something really useful and fundamental from here.
chaining functions is very usefull in this case which works on most jQuery Functions including on function output too.
It works because output of most jQuery functions are the input objects sets so you can use them right away and make it shorter and smarter
function showPhotos() {
$(this).find("span").slideToggle();
}
$(".photos")
.on("mouseenter", "li", showPhotos)
.on("mouseleave", "li", showPhotos);
And you can combine same events/functions in this way:
$("table.planning_grid").on({
mouseenter: function() {
// Handle mouseenter...
},
mouseleave: function() {
// Handle mouseleave...
},
'click blur paste' : function() {
// Handle click...
}
}, "input");
Try with the following code:
$("textarea[id^='options_'],input[id^='options_']").on('keyup onmouseout keydown keypress blur change',
function() {
}
);

How to give two functions to delegate function

I'm using JQuery and trying to use delegate for the hover action. Problem is the hover action can get two handlers, the handle in and the handle out. How can I achieve this using delegate?
I've tried this and it didn't work:
$(document).delegate('.box', 'hover',
function() { $(".a").addClass(".hover");},
function() { $(".a").removeClass(".hover");});
According to the docs for .hover:
$(selector).mouseenter(handlerIn).mouseleave(handlerOut);
So you should be able to just call delegate once for each of these functions:
$(document)
.delegate('.box', 'mouseenter', function() { alert(1); })
.delegate('.box', 'mouseleave', function() { alert(2); });
An alternative to #Justin's solution is to check the event type in the callback:
function onMouseenter()
{
alert(1);
}
function onMouseleave()
{
alert(2);
}
$(document).delegate('.box', 'hover', function(event)
{
if (event.type === 'mouseenter') onMouseenter.apply(this, arguments);
else onMouseleave.apply(this, arguments);
});
That said, it's unnecessary to use .delegate() if you're just going to delegate to document. Use .live() instead, which is much more concise:
$('.box').live('hover', function (event)
{
// snip...
});

Categories

Resources