Dragging a div a fixed distance from bottom to top - javascript

I am creating a project where I want to be able to drag a div (a drawer) that is (mostly) positioned off the bottom of the screen a fixed distance on the Y axis. The distance I want to move is the height of the div (drawer - minus the drawer handle).
It was pretty easy to get this working from top to bottom, but reversing it is posing to be quite a challenge. I feel like it might just be a simple math error.
I have put together a fiddle to better illustrate the issues I'm having.
http://jsfiddle.net/q8DE6/2/
Here's my code:
HTML
<div id="panelWrapper">
<div id="panel" class="panel">
<p> The height of this drawer is dynamic, and will slide the appropriate amounted based on the height of the content. </p>
<p> Any type of content can be included in here. The body of the drawer and the drawer pull tab can also be styled as you see fit, just modify the css/styles.css file. </p>
<!--necessary div for slide tab, modify as needed, but don't delete -->
<div class="slide">
<a id="drawerSlide" href="#" class="drawer-slide">
<table id="sTab" class="slideTab">
<tr>
<td id="stText1"></td>
<td id="stImg">Pull here.</td>
<td id="stText2"></td>
</tr>
</table>
</a>
</div>
</div><!--/panel -->
</div><!--/panelWrapper -->
<div id="content">
<div id="header">
<div id="menuBar">
<h3>Header Bar Text.</h3>
</div>
</div>
<div id="container">
</div>
<div id="footer">
<p>Footer Area.</p>
</div>
</div><!--/content -->
Slide Function:
JS:
function drawerSlide(slideDir) {
switch (slideDir) {
case 'bottomToTop':
//drawer styling
$('.panel, .slide').addClass('botToTop');
$('.panel').addClass('panelTB');
$('.slide').addClass('slideBotToTop');
$('#sTab').addClass('slideTab');
$('.panel p').filter(":first").css('padding-top','50px');
//hide overflown Y axis content. Hopefully this won't cause any conflicts with your existing code/page.
$('body').css('overflow-y','hidden');
botStartPos = $(window).height() - 50;
offset = $('#panel').offset();
panelHeight = $('#panel').outerHeight();
topEndPos = botStartPos - panelHeight +50;
yPos = botStartPos;
// if you need a different drawer starting point, adjust the starting position here (50).
panelHeight = parseFloat(panelHeight) - 50;
console.log("botStartPos:" + botStartPos);
console.log("topEndPos:" + topEndPos);
console.log("yPos:" + yPos);
$('.panel').css('top', botStartPos);
$('#panel').draggable({
axis: "y",
containment: [0, botStartPos, 0, topEndPos] //0, botStartPos, 300, topEndPos
},
{
drag: function( event, ui ) {
if (yPos > botStartPos || yPos < topEndPos) {
return false;
}
else {
offset = $(this).offset();
yPos = offset.top;
console.log(yPos);
}
}
});
}
}
$(document).ready(function() {
drawerSlide("bottomToTop");
});
I'm thinking the issue might be with the way I'm using the offset.top command to move the drawer, but I'm stumped as to how to do it correctly.
Right now what is happening, is when you click/hold the handle, it "jumps" up the fixed distance, instead of being able to drag it. Also, you can't drag down to put the drawer away, but you can drag up once again and it "jumps" down the fixed distance. Not really what I'm after.
The desired result I'm looking for is one of a typical "drawer" behavior. When the user clicks and holds on the handle, they can "pull" the drawer up the fixed distance, and then "push" it back down the same fixed distance, so the handle never falls off screen.
My guess is it that it's a math problem with the containment function. I still don't fully understand it well, so the problem may lie within the coordinates I'm using?
Any advice would be most appreciated. :)

Related

Save Location of Dragged Element - JavaScript

I'm trying to create a template where a user can drag programmable IOT items around in a room and save the template. As you will see in the code below the room is simply a div with a background image which the user has uploaded to the server. When the user opens the page again at a later time, I want to be able to load the dragged items in their saved positions. I understand how to save the data, I don't know how actually calculate where the item should be displayed on the screen in a multi-browser compatible format. I'm using the jQuery UI for dragging the IOT devices around the room.
Here is my HTML:
<div class="container">
<div class="row">
<div class="col-md-12">
<div id="room" class="room" style="background-image:url('<%= url_for(#room.background) %>')">
<div class="device draggable">
<div class="content md">
</div>
</div>
</div>
</div>
</div>
</div>
And my jQuery:
$(function() {
$( ".draggable" ).draggable();
});
You can get x and y coordinate in the drag event and persist it as shown below.
$(".draggable").draggable({
containment: "parent",
drag: function () {
var $this = $(this),
x = this.offsetLeft / (body.clientWidth - $this.width()),
y = this.offsetTop / (body.clientHeight - $this.height());
}
});
While user open page again, later on, you can assign left and top property for the element.
document.getElementsByClassName("draggable").style.left = (body.clientWidth - $shape.width()) * x + "px";
document.getElementsByClassName("draggable").style.top = (body.clientHeight - $shape.height()) * y + "px";
Here, body means window.document.body. This is what I have done to calculate the position when I want to persist the position and it works for all scenarios like browser if restored or maximize and for also for all the browsers.

Third section not on screen

I have a problem with the code below. The window does not scroll to the third section. The code jumps from slide two to slide four.
In my console log the data is correct 600, 1200, 1800 and 2400.
I tried different things but the bug is still there.
<html>
<head>
<style>
body, html{margin:0;}
.slide{height: 600px;}
button{position:fixed; top:0; left:50%; margin-left:-32px;}
</style>
</head>
<body>
<div class="container">
<div class="slide onscreen" style="background-color:#FFC000;"></div>
<div class="slide" style="background-color:#FF4800;"></div>
<div class="slide" style="background-color:#FFC480;"></div>
<div class="slide" style="background-color:#AA4560;"></div>
<div class="slide" style="background-color:#000000;"></div>
</div>
<button onclick="next()">volgende</button>
<script>
var section = document.getElementsByClassName("onscreen");
function next() {
if (section[0].nextElementSibling) {
section[0].nextElementSibling.className = "slide onscreen";
section[0].className = "slide";
var newTop = section[0].offsetTop;
window.scrollBy(0, newTop);
console.log(newTop);
}
}
</script>
</body>
</html>
These slides are all siblings. So offsetTop is going to be incrementally greater on each slide. Slide 1, 600px, slide 2, 1200px, and so on. window.scrollBy scrolls to the windows current position + the amount given. So if you are at window.scrollY = 0, and pass 600, you'll be at window.scrollY = 600. When you pass 1200 on the next go round, you'll be at window.scrollY = 1800! So now it appears as if you've skipped over slide 3, because you scrolled 2x a slide's height.
Possible answer, if you don't want the challenge of figuring the rest out:
If you have a hardcoded height for your slides, you could try passing a hardcoded scrollBy value as well. Or if you want to make your code a bit more flexible, you could query each slider for its height and pass that value instead. Then you can adjust your slide's height in css-land without breaking your js logic.

Javascript align vertical center many child divs within parent

Trying to dynamically resize the div (col with pad) with JavaScript so that it is vertically middle of the parent div (row).
The text blocks vary in size as do the images and there are many of these divs within the page.
I'm quite close to achieving this with the provided code, but the loop seems to be repeating more times than it should and sets the height incorrectly on the last pass, almost like it is halving the space over and over again.
Is there a way to make the JavaScript only run once?
<div class="row">
<div class="col pad">
<p>Text here</p>
</div>
<div class="col">
<img src="image.jpg">
</div>
</div>
$(window).load(function(){
$('.row').each(function() {
var parentDiv = $(this).height();
$('.pad').each(function() {
var childDiv = $(this).height();
var space = parentDiv - childDiv;
var half = space/2;
$(this).css('paddingTop', half + 'px');
alert(half);
});
});
});
I'm unable to use css to achieve this as col are floated.

Sliding a div / modifying a css property when using touch on an ipad

What im looking to achieve is to modify the margin-left css property of a div when someone slides their finger across the div on an ipad.
To explain what i'm trying to do, I have setup this page:
http://littleirrepressiblewonton.com/wp7/category/all/
Now when someone clicks on a thumbnail image, it loads a horizontal slideshow of large images. Some of the images are too wide to fit on the ipad and they wish to use touch to drag this horizontal slideshow of images left or right.
The way the divs are setup are as follows:
<div class='WontonGalleryFullsMask'>
<div class='WontonGalleryFulls' data-animating='no'>
<div class="WontonGalleryFullImage" data-idx="0" ><img src="http://littleirrepressiblewonton.com/wp7/wp-content/uploads/cache/VP_test_poster022/2835976114.jpg" alt="VP_test_poster022" /></div>
<div class="WontonGalleryFullImage" data-idx="1" ><img src="http://littleirrepressiblewonton.com/wp7/wp-content/uploads/cache/VP_test_poster021/663128145.jpg" alt="VP_test_poster021" /></div>
<div class="WontonGalleryFullImage" data-idx="2" ><img src="http://littleirrepressiblewonton.com/wp7/wp-content/uploads/cache/VP_test_poster020/3945564367.jpg" alt="VP_test_poster020" /></div>
</div>
</div>
The div.WontonGalleryFullsMask has the following css and is setup as a mask.
height: 523px;
overflow: hidden;
width: 100%;
and then the margin-left property of the div.WontonGalleryFulls div is modified to move the gallery left and right.
So if someone slides 300px on the ipad, I need to modify the margin-left css property of the div.WontonGalleryFulls
I'm looking for a jquery solution as the site is already using it.
i ended up modifying a script from http://popdevelop.com/2010/08/touching-the-web/
$.fn.draggable = function() {
var offset = null;
var start = function(e) {
var orig = e.originalEvent;
var ml = parseInt($(this).css('margin-left'));
offset = {
x: orig.changedTouches[0].pageX - ml //pos.left
};
};
var moveMe = function(e) {
e.preventDefault();
var orig = e.originalEvent;
$(this).css({
'margin-left': orig.changedTouches[0].pageX - offset.x
});
};
this.bind("touchstart", start);
this.bind("touchmove", moveMe);
};
$('div.WontonGalleryFulls').css('position', 'absolute');
$('div.WontonGalleryFulls').draggable();

jQuery Cycle plugin - Automatic height for containers

I'm using the cycle plugin on some divs, like this:
<div class="sections">
<div class="Section"> <img /> text </div>
<div class="Section"> <img /> text </div>
<div class="Section"> <img /> text </div>
</div>
all the .section divs have variable height, based on their contents.
How can I make cycle not to resize the container div (sections) to the largest child height? Instead I want the container to resize on every animation to the current child height.
ok, I managed to do it by hooking a function on 'after' event:
function onAfter(curr, next, opts, fwd) {
var $ht = $(this).height();
//set the container's height to that of the current slide
$(this).parent().animate({height: $ht});
}
found the info here:
http://forum.jquery.com/topic/jquery-cycle-auto-height
set containerResize option to 0 and try. More option details here.
I've done it a little bit different:
$('.cycle-list').cycle({
containerResize: 0,
before: function(currSlideElement, nextSlideElement, options, forwardFlag) {
var container = $(this).parent();
container.css('height', Math.max(container.height(), $(nextSlideElement).height()));
},
after: function(currSlideElement, nextSlideElement, options, forwardFlag) {
$(this).parent().css('height', $(this).height());
}
});
My items had different height as well. In the before, it makes sure the container is big enough for the bigger of the 2 slides. In the after, it just resizes to the next slide.
This way it never over-flows because your container is too small.
note: this is for cycle 1

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