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POThe type of positioning is really affecting my JavaScript
 

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  1. POThe type of positioning is really affecting my JavaScript
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    <p>I'm currently making a drag-and-drop JavaScript engine. I'm currently making a "bounding" feature, so that the drag-object is bounded by a container with the class <code>.bound</code>. When I make the drag-object, I also find out if it has bounds:</p> <pre><code>function makeObj(e) { obj = new Object(); obj.element = e; obj.boundX = e.parentNode.offsetWidth - e.offsetWidth; obj.boundY = e.parentNode.offsetHeight - e.offsetHeight; obj.posX = event.clientX - e.offsetLeft; obj.posY = event.clientY - e.offsetTop; var curleft = curtop = 0; if (e.offsetParent) { do { curleft += e.offsetLeft; curtop += e.offsetTop; //alert(e.id + ":" + e.innerHTML); if(~e.className.search(/bound/)) { obj.boundX = curleft - obj.element.offsetLeft; obj.boundY = curtop - obj.element.offsetTop; return obj; } } while (e = e.offsetParent); } return obj; } </code></pre> <p>My loops work, however setting the bounds does not.</p> <p>I would like this html to affect the function:</p> <pre><code>&lt;div id="center" class="bound"&gt; &lt;h1&gt;Hello World! &lt;hr /&gt;&lt;/h1&gt; &lt;div id="box" class="bound"&gt; &lt;p class="drag square" id="one"&gt; One &lt;/p&gt; &lt;p class="drag square" id="two"&gt; Two &lt;/p&gt; &lt;/div&gt; &lt;/div&gt; </code></pre> <p>As much as this html:</p> <pre><code>&lt;div id="center"&gt; &lt;!-- Difference is here --&gt; &lt;h1&gt;Hello World! &lt;hr /&gt;&lt;/h1&gt; &lt;div id="box" class="bound"&gt; &lt;p class="drag square" id="one"&gt; One &lt;/p&gt; &lt;p class="drag square" id="two"&gt; Two &lt;/p&gt; &lt;/div&gt; &lt;/div&gt; </code></pre> <p>The difference is the <code>.bound</code> class, which has <code>position: relative</code> set.</p> <p>Here is the CSS:</p> <pre><code>@charset "utf-8"; /* CSS Document */ * { padding: 0px; margin: 0px; } .drag { position: absolute; -webkit-user-select: none; -moz-user-select: none; user-select: none; } .bound { position: relative; } .square { width: 100px; height: 100px; background: red; cursor:move; } #center { width: 500px; height: 300px; margin: auto; margin-top: 50px; background-color:#ccc; text-align: center; border-radius: 25px; -moz-border-radius: 25px; } #box { background-color: #FF3; height: 278px; border-radius: 0 0 25px 25px; -moz-border-radius: 0 0 25px 25px; opacity: 0.5; } </code></pre> <p><strong>How do I make it so the <code>position:</code> attribute doesn't affect how the engine works- So that any position will work. Absolute, Relative, Static, ect? How can I make my <code>.drag</code> objects have any kind of positioning besides absolute?</strong></p> <p>I will post the entire engine below (and a jsfiddle link) just in case it is useful:</p> <p><a href="http://jsfiddle.net/Upvdm/1/" rel="nofollow">http://jsfiddle.net/Upvdm/1/</a></p> <pre><code>// JavaScript Document var dragObj; document.addEventListener("mousedown", down, false); function down(event) { if(~event.target.className.search(/drag/)) { dragObj = makeObj(event.target); dragObj.element.style.zIndex="100"; document.addEventListener("mousemove", freeMovement, false); } } function freeMovement(event) { if (typeof(dragObj.element.mouseup) == "undefined") document.addEventListener("mouseup", drop, false); //Prevents redundantly adding the same event handler repeatedly dragObj.element.style.left = Math.max(0, Math.min(event.clientX - dragObj.posX, dragObj.boundX)) + "px"; dragObj.element.style.top = Math.max(0, Math.min(event.clientY - dragObj.posY, dragObj.boundY)) + "px"; } function drop() { dragObj.element.style.zIndex="1"; document.removeEventListener("mousemove", freeMovement, false); document.removeEventListener("mouseup", drop, false); //alert("DEBUG_DROP"); } function makeBoundlessObj(e) { obj = new Object(); obj.element = e; obj.boundX = e.parentNode.offsetWidth - e.offsetWidth; obj.boundY = e.parentNode.offsetHeight - e.offsetHeight; obj.posX = event.clientX - e.offsetLeft; obj.posY = event.clientY - e.offsetTop; return obj; } function makeObj(e) { obj = new Object(); obj.element = e; obj.boundX = e.parentNode.offsetWidth - e.offsetWidth; obj.boundY = e.parentNode.offsetHeight - e.offsetHeight; obj.posX = event.clientX - e.offsetLeft; obj.posY = event.clientY - e.offsetTop; var curleft = curtop = 0; if (e.offsetParent) { do { curleft += e.offsetLeft; curtop += e.offsetTop; //alert(e.id + ":" + e.innerHTML); if(~e.className.search(/bound/)) { obj.boundX = curleft - obj.element.offsetLeft; obj.boundY = curtop - obj.element.offsetTop; return obj; } } while (e = e.offsetParent); } return obj; } function findPos(obj) { // Donated by `lwburk` on StackOverflow var curleft = curtop = 0; if (obj.offsetParent) { do { curleft += obj.offsetLeft; curtop += obj.offsetTop; } while (obj = obj.offsetParent); return { x: curleft, y: curtop }; } } </code></pre> <p>Thank you so much for reading and helping!</p>
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    1. CONot to be that guy, but don't reinvent the wheel unless you're trying to learn something: http://jqueryui.com/demos/draggable/
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    2. COlearning about wheels eh? In your `makeObj` function you use `event` which hasn't been passed in and so is undefined
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    3. CO@Tom, thanks for being "that guy" - it shows that you do care about helping. However, this is my first week of JavaScript (ever), so I'm trying to learn the language before I jump into libraries!
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