Add option to make dialog draggable

[Luca Salvarani]

It would be very useful to have an option to make the dialog draggable

For example:

$.Zebra_Dialog("Test dialog", {
    title: "Test Title",
    custom_class: "test_draggable",
    draggable: true
});

Demo

Something similar can be achieved:

/**
 * 
 * @param {HTMLElement} draggable_element- The whole element you want to make draggable
 * @param {HTMLElement} trigger_element- The element that is going to trigger the drag
 */
function makeElementDraggable(draggable_element, trigger_element) {
		var pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0;

		if(trigger_element ){
			initDrag(trigger_element)

			trigger_element.style.cursor = "grab";
		}
		else if (document.getElementById(draggable_element.id + "-header")) {
			// if present, the header is where you move the DIV from:
			initDrag(document.getElementById(draggable_element.id + "-header"))
			document.getElementById(draggable_element.id + "-header").style.cursor = "grab";
		}
		else if (draggable_element.querySelector(".ZebraDialog_Title")) {
			// if it's a Zebra Dialog, init from the Title
			initDrag(draggable_element.querySelector(".ZebraDialog_Title"))
			draggable_element.querySelector(".ZebraDialog_Title").style.cursor = "grab";
		} else {
			// otherwise, move the DIV from anywhere inside the DIV:
			initDrag(draggable_element)
		}

		// Save original position
		draggable_element.dataset.beforeMovableTop = getComputedStyle(draggable_element).top;
		draggable_element.dataset.beforeMovableLeft = getComputedStyle(draggable_element).left;
		draggable_element.classList.add("isDraggable");

		

		function initDrag(e) {
			e.onmousedown = dragMouseDown;
		}

		function dragMouseDown(e) {
			e = e || window.event;
			e.preventDefault();
			// get the mouse cursor position at startup:
			pos3 = e.clientX;
			pos4 = e.clientY;
			document.onmouseup = closeDragElement;
			// call a function whenever the cursor moves:
			document.onmousemove = elementDrag;
		}
	
		function elementDrag(e) {
			e = e || window.event;
			e.preventDefault();
			// calculate the new cursor position:
			pos1 = pos3 - e.clientX;
			pos2 = pos4 - e.clientY;
			pos3 = e.clientX;
			pos4 = e.clientY;
			// set the element's new position:
			draggable_element.style.top = (draggable_element.offsetTop - pos2) + "px";
			draggable_element.style.left = (draggable_element.offsetLeft - pos1) + "px";
		}
	
		function closeDragElement() {
			// stop moving when mouse button is released:
			document.onmouseup = null;
			document.onmousemove = null;
		}
	}

Then:

$.Zebra_Dialog("Test dialog", {
    title: "Test Title",
    custom_class: "test_draggable"
});

var element= document.querySelector(".ZebraDialog.test_draggable");
makeElementDraggable(element)

Or you could use this similar answer or even jQueryUI's draggable

Result

If you want i could try and make a PR when i have the time :)

[Stefan Gabos]

jQuery UI is out of the question - I wouldn't want to impose that on users; i'll definitely check the code you sent - thank you!