Develop Reference

How to display moving text field during other jQuery animation?

I am attempting to replicate the loading page at http://www.alessioatzeni.com/ but the percentage loaded text on my page will not display until the loading line animation completes. You can see my project page at https://jaredblumer.github.io/atzeniStudy/
If you inspect the HTML using Chrome Developer Tools, you'll see that the #loader-percentage span text is dynamically updating, but for a reason unbeknownst to me the text is not displaying until after the line animation ends.
The code I am currently using for this is as follows:
HTML
<div id="loader" class="loader">
<span id="loader-line" class="loader-line">
<span id="loader-percentage" class="loader-percentage"></span>
</span>
</div>
Javascript (loader.js)
$(document).ready(function() {
//Loading Page
var pageLoader = function() {
var $elements = $('body').find('img[src]');
$('body [style]').each(function(){
var src = $(this).css('background-image').replace(/^url\(["']?/, '').replace(/["']?\)$/, '');
if(src) {
$elements = $elements.add($('<img src="' + src + '"/>'));
}
});
var $loading = $('#loader');
var $loadPercentageLine = $('#loader-line');
var $loadPercentageText = $('#loader-percentage');
var elementsLoaded = 0;
var speed = 5000;
var animatePercentage = function(e) {
console.log(e);
$loadPercentageText.text(parseInt(e));
};
var loading = function() {
var percentage = 0;
if ($elements.length) {
percentage = parseInt((elementsLoaded / $elements.length) * 100);
}
$loadPercentageLine.stop().animate({
height:percentage + '%'
}, speed);
$loadPercentageText.stop().animate({
percentage:percentage
}, {
duration: speed,
step: animatePercentage
});
};
if($elements.length) {
loading();
$elements.each(function() {
elementsLoaded++;
loading();
});
}
};
pageLoader();
});

here is solution:
.loader-line{
overflow: visible !important;
}

Jquery: $.each() returns value then ends

I have jQuery code to resize several Iframes based on the container they are in. When I did this without the .each() operator All of the iframes used the same div to base their size off of. With .each() the operator runs as evidenced by an alert but does not continue down the function.
Codepen: https://codepen.io/bjackson2016/pen/oLQopy?editors=0010
$(document).ready(function(){
function resize() {
var elements = $('.resize');
var eachElement = $.makeArray(elements);
alert(eachElement);
$.each(eachElement, function(index, value) {
alert(index + " " + value);
var multi = value.data('wfactor');
alert(multi);
var ratio = value.data('ratio');
alert(ratio);
var minX = value.data('minw');
alert(minX);
var minY = value.data('minh');
alert(minY);
var ruler = value.siblings('.widthTest');
alert(ruler);
var pWidth = ruler.width();
alert(pWidth);
var adjWidth = pWidth * multi;
alert(adjWidth);
var eHeight = (Math.round(ratio * adjWidth));
alert(eHeight);
var unadjHeight = Math.round(ratio * pWidth);
alert(unadjHeight);
var eWidth = (Math.round(adjWidth));
alert(eWidth);
if (eHeight < minY) {
$(this).height(minY);
alert('changed height');
} else {
value.height(eHeight);
alert('normal height');
}
if (eWidth < minX) {
value.css('width', pWidth).css('height', unadjHeight);
alert('changed width');
} else {
value.width(eWidth);
alert('kept width');
}
});
}
resize();
$(window).resize(function() {
resize();
});
});

The problem is that there is no value.data().
data() is a jQuery function, and iterating with $.each unwraps the elements, so you're trying to call data() on a native DOM node
$.each(eachElement, function(index, value) {
// value is not a jQuery object here, you'd have to do
var elem = $(value); // where you wrap it again.
});
Try instead
$(document).ready(function() {
$(window).on('resize', resize).trigger('resize');
function resize() {
$('.resize').each(function(index, element) {
var elem = $(element);
var multi = elem.data('wfactor'),
ratio = elem.data('ratio'),
... etc
});
}
});

Javascript module pattern - what am I doing wrong?

A working version of this is here: http://est.pagodabox.com/client/svedka
I have the following function which I'm trying to convert into a module pattern, but when I try to use one of the function that I return at the bottom, for example:
est_project.closeContent($html);
I get an error that it's not a function. Is there something i'm doing wrong here?
Thanks!
var est_project = (function(){
// Setup functions
var flexDestroy,
cloneCurrent,
clonePosition,
switchSlide,
projectLayout,
contentHeight,
slidePos,
slideClick,
infoToggle,
closeContent;
// Destroy flexslider
flexDestroy = function($slider,$cleanSlider, $projBg) {
// Insert the clone of the un-initialized slide element, and remove the current flexslider
// Effectively "destroys" the current slider
var $curSlide = $slider.find('.flex-active-slide'),
// Get the zero based index of current slide
curSlideIndex = $curSlide.index() - 1,
curBg = $curSlide.find('img').attr('src'),
slideCount = $cleanSlider.data('count'),
i = 0,
$rearrange = $('');
// When you switch projects, the current slide should stay put
if(curSlideIndex !== 0 && slideCount > 1) {
// Cut from the current slide to the end, paste at the beginning
for(i = 0 ; i < slideCount; i += 1) {
if(curSlideIndex > i) {continue;}
$rearrange = $rearrange.add( $cleanSlider.find('li:eq(' + i + ')') );
}
$rearrange.remove();
$cleanSlider.find('li:first-child').before($rearrange)
$cleanSlider.css({'background-image' : 'url(' + curBg + ')'});
}
$slider.after($cleanSlider).remove();
clonePosition(slideheight);
};
return {
// Clone current
cloneCurrent: function($el) {
var $clean,
slideCount = $el.find('li').length;
$clean = $el.clone();
$clean.removeClass('project-current').find('div').removeClass('img-loading');
$clean.data('count',slideCount);
return $clean;
},
// Set the clone position, for when we add it to the DOM or resize the window
clonePosition: function(slideheight) {
var n = $cleanSlider.index(),
$myBg = $cleanSlider.find('div'),
myPosition = n * slideheight;
// Set the position of the inserted clone
$cleanSlider
.css({height: slideheight, top: myPosition, position : 'absolute'});
$myBg
.css({height: slideheight});
},
switchSlide: function($me, $slider) {
$('.project-current').removeClass('project-current');
$me.addClass('project-current');
// Get rid of current flexslider
flexDestroy($slider,$cleanSlider);
// Clone the unitialized slider so we can add it back in later when it gets destroyed
$cleanSlider = cloneCurrent($me);
$me.addClass('flexslider').flexslider({
animation: "slide",
animationSpeed: 500,
slideshow: false,
manualControls: '.dot-nav li a'
});
// After the flexslider initializes, slide the content
setTimeout(function(){
slidePos($me, $slidewrap, slideheight, $win);
},100);
},
// Custom "masonry" function, absolutely positions each project div according to the slide height
projectLayout: function(slideheight,$proj,$projBg) {
var n = 0;
$proj.each(function(){
var $me = $(this),
myPosition = n * slideheight;
// Set all the heights
$me
.css({top: myPosition, position : 'absolute'})
.add($projBg)
.css({height: slideheight});
n++;
});
},
// Set slide wrapper height to window height
contentHeight: function($win, $slidewrap) {
var winHeight = $win.height();
$slidewrap.css({height: winHeight});
},
// Set slide wrapper position to slide to the clicked slide, and set content position
slidePos: function($me, $slidewrap, slideheight, $win) {
var $contentText = $('.project-content .text'),
projNavHeight = Math.round( $win.height() * .1 ),
curIndex = $me.index(),
curTop = 0 - (curIndex * slideheight) + projNavHeight;
$slidewrap.css({transform: 'translate(0,' + curTop.toString() + 'px)'});
$('.corner-btn').add($contentText).css({'padding-top' : projNavHeight});
setTimeout(function(){
$slidewrap.removeClass('tr-none movin').addClass('tr-all');
$('.project').css({opacity: .4})
}, 100);
},
// Click a project, slide to it
slideClick: function($proj) {
$('.project').live('click',function(){
var $me = $(this),
myHref = $me.data('href'),
myTitle = $me.data('title'),
$slider = $('.flexslider'),
indexMy = $me.index(),
indexCur = $('.project-current').index(),
projDir;
$me.css({opacity: 1});
// Stop here if we click on the current project
if($me.hasClass('project-current')) {
return false;
}
History.pushState(null,myTitle,myHref);
});
},
// Hide and show content
infoToggle: function() {
// Open content
$('#corner-btn-info').on('click',function(){
$html.addClass('show-content');
if($('.project-content .text').height() <= $win.height()) {
$html.addClass('no-overflow');
}
$('.project-content-wrap').css({'z-index': 10});
});
// Close content
$('#corner-btn-close').live('click',function(){
closeContent($html);
});
},
closeContent: function($html) {
$html.removeClass('show-content');
setTimeout(function(){
$('.project-content-wrap').css({'z-index': -1});
$html.removeClass('no-overflow');
$('#classy').animate({scrollTop: 0})
},300);
}
};
});

The problem is that you're not executing the anonymous function, your code is the equivalent of:
var est_project = function() {};
You need to execute the function if you want it to return the functions defined in it.
Just replace the last line:
});
By:
}());
Or you can keep your code and call the closeContent function like this:
est_project().closeContent();
But I guess that's not what you want :-) You'd instantiate a new object everytime you call the est_project function.

At the start and end of your file just attach the object to window with the executed function and wrap whole function inside a self executing function. like this
(function(global) {
//your code goes here
global.est_project = est_project();
})(this)

Save html5 canvas element to file (local)

I'm doing a webapp on Android, and I've a HTML5 Canvas on which an user can draw what he wants using touch events. And I would like to save this on a sdcard, so in local. And can't use any server side script (php etc) to do that stuff.
I'm using a magictouch.js example :
<canvas id="example" height=450 width=300></canvas>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script type="text/javascript" src="magictouch.js"></script>
<script>
var CanvasDrawr = function(options) {
var canvas = document.getElementById(options.id),
ctxt = canvas.getContext("2d");
var img = canvas.toDataURL("image/png");
ctxt.lineWidth = options.size || Math.ceil(Math.random() * 35);
ctxt.lineCap = options.lineCap || "round";
ctxt.pX = undefined;
ctxt.pY = undefined;
var lines = [,,];
var offset = $(canvas).offset();
var self = {
//bind click events
init: function() {
canvas.addEventListener('touchstart', self.preDraw, false);
canvas.addEventListener('touchmove', self.draw, false);
},
preDraw: function(event) {
$.each(event.touches, function(i, touch) {
var id = touch.identifier;
lines[id] = { x : this.pageX - offset.left,
y : this.pageY - offset.top,
color : options.color || ["black"]
};
});
event.preventDefault();
},
draw: function(event) {
var e = event, hmm = {};
$.each(event.touches, function(i, touch) {
var id = touch.identifier;
var moveX = this.pageX - offset.left - lines[id].x,
moveY = this.pageY - offset.top - lines[id].y;
var ret = self.move(id, moveX, moveY);
lines[id].x = ret.x;
lines[id].y = ret.y;
});
event.preventDefault();
},
move: function(i, changeX, changeY) {
ctxt.strokeStyle = lines[i].color;
ctxt.beginPath();
ctxt.moveTo(lines[i].x, lines[i].y);
ctxt.lineTo(lines[i].x + changeX, lines[i].y + changeY);
ctxt.stroke();
ctxt.closePath();
return { x: lines[i].x + changeX, y: lines[i].y + changeY };
}
};
return self.init();
};
$(function(){
var super_awesome_multitouch_drawing_canvas_thingy = new CanvasDrawr({id:"example", size: 2 });
console.log('loaded');
});
</script>
</body>
But all examples which I met on Internet were used with a php script on a server to decode and save the canva as an image. And actually just want to do that on my Android device, in my sdcard, by just using HTML5/Javascript...
Thanks.

Did you check nihilogic library ?
http://www.nihilogic.dk/labs/canvas2image/
It use toDataUrl() function so you may get an ugly name of pictures but still you will have a picture.
You also can use downloadify but it use flash and I know flash is not often on android, depend your case https://github.com/dcneiner/Downloadify
Also I, like kbok, don't know phoneGap but you could probably try to use both context.toDataUrl() and fwrite.

This is not possible since you do not have access to the filesystem from a web page (Except some edge cases, which are not useful here).
What I would advise, of course, is to use the server to generate this file. Since it's not possible, you may find a way to execute "native" code on the client by using a plugin, or a Java applet.

Why don't you convert the to an image on the server side and then allow the user to download the image onto their phone?

Javascript & jQuery: how to make function infinite through animate callback?

have an object of a class Abon and then i want this object to move around the page.
a = new Abon();
a.init();
a.move();
the method move() contains:
function abon_move () {
var x = this.x;
var y = this.y;
var direction_x = Math.random()*5 - 5;
var direction_y = Math.random()*5 - 5;
var x_new = x + direction_x * this.movement_rate;
var y_new = y + direction_y * this.movement_rate;
console.log(x_new+" "+y_new)
$(".abonent."+this.id).animate( {
left:+x_new,
top:+y_new
}, 'slow', "linear", function() { this.move() });
}
All i want is that the method move (represented as function abon_move()) repeated again and again, after the animate stops. But the problem is that this.move() shown in callback has no connection to my object, because this in that place points to the HTML element, selected by jQuery.
UPD:
function Abon(id) {
...
this.move = abon_move;
...
}
Abon.prototype.move = abon_move;
And the actual method is the same, but with no callback in animate
then i try doing the following:
setInterval( a[0].move , 300); //doesn't work - says `this` members are undefined
setInterval( a[0].move() , 300); //works only one time and stops
Thank you for any help!

Try this :
function abon_move () {
var x = this.x;
var y = this.y;
var class = this;
...
}
Then, inside your jQuery animate, your can refer to your class using the variable class

Wrap the function abon_move() in a setTimeout call, as such: setTimeout(abon_move, 300); so it will run every 300 ms.