I've written a plugin to create long click event handler for my web application. I know it is not too advanced and that it has low functionality, but I am trying to improve it. You can see my plugin below:
$(function($) {
var holdTimer;
var timerRunning = false;
$.fn.longClick = function(handler, time) {
if (time == undefined) time = 500;
return this.on({
mouseup: function() {
clearTimeout(holdTimer);
timerRunning = false;
},
mousedown: function() {
var self = this;
timerRunning = true;
holdTimer = window.setTimeout(function() {
handler.call(self)
}, time);
}
})
};
$.fn.longClick.defaultTime = 500;
}(jQuery));
What is my problem?
I am in the situation of putting Ajax-generated content on my page, and you can easily know that .longClick() won't work anymore for those elements.
I have the following snippet:
$.ajax({
url: "/ajax/",
type: "POST",
data: {
action: "load-posts",
},
dataType: "html",
success: function(data) {
$(".profile-wrapper").append(data);
}
});
The data looks like this:
<div class="post">
<div class="comments">Comments</div>
</div>
Then I need to use the .longClick event for .comments. I found this, on Stack Overflow, and I know which my situation is, but I don't know how to modify my plugin to work like $(selector).on(event,childSelector,data,function).
How would you modify this plugin to work on dynamic content? Thank you for your patience and help.
EDIT FOR #AminJafari
The long-click event now fires, but inside the function, the .post seems to be undefined:
$(".profile-wrapper .tabs-wrapper .tab .post").longClick(function () {
var $post = $(this);
var menuTop = $post.offset().top + "px";
// ...
}
Output from the console:
Uncaught TypeError: Cannot read property 'top' of undefined
UPDATED:
$(function($) {
var holdTimer;
var timerRunning = false;
$.fn.longClick = function(handler, time) {
if (time == undefined) time = 500;
var that=$(this);
$(document).on('mouseup',that,function(){
clearTimeout(holdTimer);
timerRunning = false;
});
$(document).on('mousedown',that,function(){
var self = this;
timerRunning = true;
holdTimer = window.setTimeout(function() {
handler.call(self)
}, time);
});
};
$.fn.longClick.defaultTime = 500;
}(jQuery));
Related
I want to use preventDefault() in .each function for collection of buttons and its not working. When I use it with one .click function it works fine but inside .each is not
Whan am I doing wrong?
Here is my .js code
$(document).ready(function() {
var findingStatus = $('#findingStatus').attr('finding-status-type');
var findingLike = $('#finding_like_btn');
var findingDislikeBox = $('.finding_dislike_add');
var findingDislikeCollection = $('.finding_dislike_add_btn')
var findingUnlike = $('#finding_unlike_btn');
var findingDislikeRemoved = $('#finding_dislike_removed');
var alertBox = $('.alert-box').hide();
if (findingStatus == 0) {
findingDislikeBox.show();
findingUnlike.hide();
findingDislikeRemoved.hide();
}
else if (findingStatus == 1) {
findingDislikeBox.hide();
findingUnlike.show();
findingDislikeRemoved.hide();
}
else if (findingStatus == 2) {
findingDislikeRemoved.show();
findingUnlike.show();
findingDislikeBox.hide();
findingLike.hide();
}
findingDislikeCollection.each(function() {
var findingDislike = $(this).clone();
var url = findingDislike.attr("href");
findingDislike.click(function(event) {
event.preventDefault();
$.ajax({
url: url,
type: "POST",
dataType: "json",
success: function(data) {
if (data.profileState == 1) {
$('#dislike_count_btn').text('Odrzuć' + data.DislikeCount);
findingDislikeBox.hide();
findingDislikeRemoved.show();
findingUnlike.show();
//findingUnDislike.show();
//findingUnDislike.attr('disabled', false );
//findingUnDislike.text('Cofnij');
}
else {
alertBox.show();
if ($('.alert-box-msg').length==0) {
$('.alert-area').prepend('<p class="alert-area alert-box-msg">Żeby korzystać z tej funkcji musisz być zalogowany.</p>');
}
findingDislike.attr('disabled', false );
}
},
error: function() {
alert('Problem z serwerem, spróbuj ponownie za kilka minut.');
findingDislike.attr('disabled', false );
}
});
});
});
$('html').click(function (e) {
if (!$(e.target).hasClass('alert-area')) {
$('.alert-box').hide();
findingDislike.attr('disabled', false );
}
});
});
Thanks for answer
You are cloning the element with .clone which means you're not actually attaching an event listener to anything in the DOM. Cloned elements must be manually inserted into the DOM with JavaScript for them to have any effect.
This is not a correct way. Following should work:
findingDislikeCollection.click(function(event){
var findingDislike = $(this);
var url = findingDislike.attr("href");
//AJAX call
event.preventDefault();
});
More details on click event are given here:
https://api.jquery.com/click/
I've done AJAX post loaders before but I'm having quite an hard time with jScrollPane.
Two things:
where should I load the posts? the div i created (#reviewspostscont) or .jspPane that JScrollPane makes? what if i have multiple loops then?
a more practical one now, this is the code i have so far, I can't get the function that triggers the AJAX to get the isAtRight variable (undefined in console), any fix?
Thanks in advance, Matt
$(function() {
$('#reviewspostscont').each(function() {
$(this).bind(
'jsp-scroll-x',
function(event, scrollPositionX, isAtLeft, isAtRight) {
console.log('Handle jsp-scroll-x', this,
'scrollPositionX=', scrollPositionX,
'isAtLeft=', isAtLeft,
'isAtRight=', isAtRight);
}
);
$(this).jScrollPane({ horizontalDragMaxWidth: 100 });
var api = $(this).data('jsp');
var throttleTimeout;
$(window).bind('resize', function() {
if (!throttleTimeout) {
throttleTimeout = setTimeout(function() {
api.reinitialise();
throttleTimeout = null;
}, 50);
}
});
});
$('#reviewspostscont').scroll(function() {
var $this = $(this);
var scrollWidth = $this[0].scrollWidth - $this.width();
var scrollPercentage = $this.scrollLeft() / scrollWidth * 100;
if (isAtRight == true) {
loadArticle(count);
count++;
}
});
function loadArticle(pageNumber) {
$.ajax({
url: "<?php bloginfo('wpurl') ?>/wp-admin/admin-ajax.php",
type:'POST',
data: "action=infinite_scroll&page_no="+ pageNumber + '&loop_file=loop',
success: function(html) {
$("#reviewspostscont").append(html); // This will be the div where our content will be loaded
}
});
return false;
}
});
So, I'd like to fire a function only once on scroll (using Scrollstop, given by a stackoverflow answer)
The problem is that I don't get to fire the function only once. I've tried different solutions ( .on(), setting a counter, setting it outside/inside the window.scrollstop function) but nothing worked.
I don't think it's difficult, but.. I didn't get to make it work so far.
Here's the plugin I'm using
$.fn.scrollStopped = function(callback) {
$(this).scroll(function(){
var self = this, $this = $(self);
if ($this.data('scrollTimeout')) {
clearTimeout($this.data('scrollTimeout'));
}
$this.data('scrollTimeout', setTimeout(callback,300,self));
});
};
and here's my code:
$(window).scrollStopped(function(){
if ($(".drawing1").withinViewport()) {
doNothing()
}
})
var doNothing = function() {
$('#drawing1').lazylinepainter('paint');
}
(removed the counter since it didn't work)
Live demo here
PS: the function I'd like to make happen only once is the lazyPaint. It begins when we scroll to the element but it fires once again when it ends.
Here's my version of having a function fire once while listening to the scroll event:
var fired = false;
window.addEventListener("scroll", function(){
if (document.body.scrollTop >= 1000 && fired === false) {
alert('This will happen only once');
fired = true;
}
}, true)
how about using a variable to see whether it was previously fired:
var fired = 0;
$.fn.scrollStopped = function(callback) {
$(this).scroll(function(){
if(fired == 0){
var self = this, $this = $(self);
if ($this.data('scrollTimeout')) {
clearTimeout($this.data('scrollTimeout'));
}
$this.data('scrollTimeout', setTimeout(callback,300,self));
fired = 1;
}
});
};
These anwsers didn't work for me so here's my code:
var fired = 0;
jQuery(this).scroll(function(){
if(fired == 0){
alert("fired");
fired = 1;
}
});
How about this solution?
function scrollEvent() {
var hT = $('#scroll-to').offset().top,
hH = $('#scroll-to').outerHeight(),
wH = $(window).height(),
wS = $(this).scrollTop();
if (wS > (hT+hH-wH)){
console.log('H1 on the view!');
window.removeEventListener("scroll", scrollEvent);
}
}
window.addEventListener("scroll", scrollEvent);
The question is a bit old, but as it popped up first when I search for "addeventlistener scroll once", I will add this reply. There is now a { once: true } parameter to only trigger an event once.
window.addEventListener("scroll", () => {
/* your code here */
}, { once: true });
I have some jQuery plugin that changes some elements, i need some event or jQuery plugin that trigger an event when some text input value changed.
I've downloaded jquery.textchange plugin, it is a good plugin but doesn't detect changes via external source.
#MSS -- Alright, this is a kludge but it works:
When I call boxWatcher() I set the value to 3,000 but you'd need to do it much more often, like maybe 100 or 300.
http://jsfiddle.net/N9zBA/8/
var theOldContent = $('#theID').val().trim();
var theNewContent = "";
function boxWatcher(milSecondsBetweenChecks) {
var theLoop = setInterval(function() {
theNewContent = $('#theID').val().trim();
if (theOldContent == theNewContent) {
return; //no change
}
clearInterval(theLoop);//stop looping
handleContentChange();
}, milSecondsBetweenChecks);
};
function handleContentChange() {
alert('content has changed');
//restart boxWatcher
theOldContent = theNewContent;//reset theOldContent
boxWatcher(3000);//3000 is about 3 seconds
}
function buttonClick() {
$('#theID').value = 'asd;lfikjasd;fkj';
}
$(document).ready(function() {
boxWatcher(3000);
})
try to set the old value into a global variable then fire onkeypress event on your text input and compare between old and new values of it. some thing like that
var oldvlaue = $('#myInput').val();
$('#myInput').keyup(function(){
if(oldvlaue!=$('#myInput').val().trim())
{
alert('text has been changed');
}
});
you test this example here
Edit
try to add an EventListner to your text input, I don't know more about it but you can check this Post it may help
Thanks to #Darin because of his/her solution I've marked as the answer, but i have made some small jQuery plugin to achieve the same work named 'txtChgMon'.
(function ($) {
$.fn.txtChgMon = function (func) {
var res = this.each(function () {
txts[0] = { t: this, f: func, oldT: $(this).val(), newT: '' };
});
if (!watchStarted) {
boxWatcher(200);
}
return res;
};
})(jQuery);
var txts = [];
var watchStarted = false;
function boxWatcher(milSecondsBetweenChecks) {
watchStarted = true;
var theLoop = setInterval(function () {
for (var i = 0; i < txts.length; i++) {
txts[i].newT = $(txts[i].t).val();
if (txts[i].newT == txts[i].oldT) {
return; //no change
}
clearInterval(theLoop); //stop looping
txts[i].f(txts[i], txts[i].oldT, txts[i].newT);
txts[i].oldT = $(txts[i].t).val();
boxWatcher(milSecondsBetweenChecks);
return;
}
}, milSecondsBetweenChecks);
}
I'm trying to build a Javascript listener for a small page that uses AJAX to load content based on the anchor in the URL. Looking online, I found and modified a script that uses setInterval() to do this and so far it works fine. However, I have other jQuery elements in the $(document).ready() for special effects for the menus and content. If I use setInterval() no other jQuery effects work. I finagled a way to get it work by including the jQuery effects in the loop for setInterval() like so:
$(document).ready(function() {
var pageScripts = function() {
pageEffects();
pageURL();
}
window.setInterval(pageScripts, 500);
});
var currentAnchor = null;
function pageEffects() {
// Popup Menus
$(".bannerMenu").hover(function() {
$(this).find("ul.bannerSubmenu").slideDown(300).show;
}, function() {
$(this).find("ul.bannerSubmenu").slideUp(400);
});
$(".panel").hover(function() {
$(this).find(".panelContent").fadeIn(200);
}, function() {
$(this).find(".panelContent").fadeOut(300);
});
// REL Links Control
$("a[rel='_blank']").click(function() {
this.target = "_blank";
});
$("a[rel='share']").click(function(event) {
var share_url = $(this).attr("href");
window.open(share_url, "Share", "width=768, height=450");
event.preventDefault();
});
}
function pageURL() {
if (currentAnchor != document.location.hash) {
currentAnchor = document.location.hash;
if (!currentAnchor) {
query = "section=home";
} else {
var splits = currentAnchor.substring(1).split("&");
var section = splits[0];
delete splits[0];
var params = splits.join("&");
var query = "section=" + section + params;
}
$.get("loader.php", query, function(data) {
$("#load").fadeIn("fast");
$("#content").fadeOut(100).html(data).fadeIn(500);
$("#load").fadeOut("fast");
});
}
}
This works fine for a while but after a few minutes of the page being loaded, it drags to a near stop in IE and Firefox. I checked the FF Error Console and it comes back with an error "Too many Recursions." Chrome seems to not care and the page continues to run more or less normally despite the amount of time it's been open.
It would seem to me that the pageEffects() call is causing the issue with the recursion, however, any attempts to move it out of the loop breaks them and they cease to work as soon as setInterval makes it first loop.
Any help on this would be greatly appreciated!
I am guessing that the pageEffects need added to the pageURL content.
At the very least this should be more efficient and prevent duplicate handlers
$(document).ready(function() {
pageEffects($('body'));
(function(){
pageURL();
window.setTimeout(arguments.callee, 500);
})();
});
var currentAnchor = null;
function pageEffects(parent) {
// Popup Menus
parent.find(".bannerMenu").each(function() {
$(this).unbind('mouseenter mouseleave');
var proxy = {
subMenu: $(this).find("ul.bannerSubmenu"),
handlerIn: function() {
this.subMenu.slideDown(300).show();
},
handlerOut: function() {
this.subMenu.slideUp(400).hide();
}
};
$(this).hover(proxy.handlerIn, proxy.handlerOut);
});
parent.find(".panel").each(function() {
$(this).unbind('mouseenter mouseleave');
var proxy = {
content: panel.find(".panelContent"),
handlerIn: function() {
this.content.fadeIn(200).show();
},
handlerOut: function() {
this.content.slideUp(400).hide();
}
};
$(this).hover(proxy.handlerIn, proxy.handlerOut);
});
// REL Links Control
parent.find("a[rel='_blank']").each(function() {
$(this).target = "_blank";
});
parent.find("a[rel='share']").click(function(event) {
var share_url = $(this).attr("href");
window.open(share_url, "Share", "width=768, height=450");
event.preventDefault();
});
}
function pageURL() {
if (currentAnchor != document.location.hash) {
currentAnchor = document.location.hash;
if (!currentAnchor) {
query = "section=home";
} else {
var splits = currentAnchor.substring(1).split("&");
var section = splits[0];
delete splits[0];
var params = splits.join("&");
var query = "section=" + section + params;
}
var content = $("#content");
$.get("loader.php", query, function(data) {
$("#load").fadeIn("fast");
content.fadeOut(100).html(data).fadeIn(500);
$("#load").fadeOut("fast");
});
pageEffects(content);
}
}
Thanks for the suggestions. I tried a few of them and they still did not lead to the desirable effects. After some cautious testing, I found out what was happening. With jQuery (and presumably Javascript as a whole), whenever an AJAX callback is made, the elements brought in through the callback are not binded to what was originally binded in the document, they must be rebinded. You can either do this by recalling all the jQuery events on a successful callback or by using the .live() event in jQuery's library. I opted for .live() and it works like a charm now and no more recursive errors :D.
$(document).ready(function() {
// Popup Menus
$(".bannerMenu").live("hover", function(event) {
if (event.type == "mouseover") {
$(this).find("ul.bannerSubmenu").slideDown(300);
} else {
$(this).find("ul.bannerSubmenu").slideUp(400);
}
});
// Rollover Content
$(".panel").live("hover", function(event) {
if (event.type == "mouseover") {
$(this).find(".panelContent").fadeIn(200);
} else {
$(this).find(".panelContent").fadeOut(300);
}
});
// HREF Events
$("a[rel='_blank']").live("click", function(event) {
var target = $(this).attr("href");
window.open(target, "_blank");
event.preventDefault();
});
$("a[rel='share']").live("click", function(event) {
var share_url = $(this).attr("href");
window.open(share_url, "Share", "width=768, height=450");
event.preventDefault();
});
setInterval("checkAnchor()", 500);
});
var currentAnchor = null;
function checkAnchor() {
if (currentAnchor != document.location.hash) {
currentAnchor = document.location.hash;
if (!currentAnchor) {
query = "section=home";
} else {
var splits = currentAnchor.substring(1).split("&");
var section = splits[0];
delete splits[0];
var params = splits.join("&");
var query = "section=" + section + params;
}
$.get("loader.php", query, function(data) {
$("#load").fadeIn(200);
$("#content").fadeOut(200).html(data).fadeIn(200);
$("#load").fadeOut(200);
});
}
}
Anywho, the page works as intended even in IE (which I rarely check for compatibility). Hopefully, some other newb will learn from my mistakes :p.