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JavaScript

function makeDragable(dragHandle, dragTarget) {
let dragObj = null; //object to be moved
let xOffset = 0; //used to prevent dragged object jumping to mouse location
let yOffset = 0;
document.querySelector(dragHandle).addEventListener("mousedown", startDrag, true);
document.querySelector(dragHandle).addEventListener("touchstart", startDrag, true);
/*sets offset parameters and starts listening for mouse-move*/
function startDrag(e) {
e.preventDefault();
e.stopPropagation();
dragObj = document.querySelector(dragTarget);
dragObj.style.position = "absolute";
let rect = dragObj.getBoundingClientRect();
if (e.type=="mousedown") {
xOffset = e.clientX - rect.left; //clientX and getBoundingClientRect() both use viewable area adjusted when scrolling aka 'viewport'
yOffset = e.clientY - rect.top;
window.addEventListener('mousemove', dragObject, true);
} else if(e.type=="touchstart") {
xOffset = e.targetTouches[0].clientX - rect.left;
yOffset = e.targetTouches[0].clientY - rect.top;
window.addEventListener('touchmove', dragObject, true);
}
}
/*Drag object*/
function dragObject(e) {
e.preventDefault();
e.stopPropagation();
if(dragObj == null) {
return; // if there is no object being dragged then do nothing
} else if(e.type=="mousemove") {
dragObj.style.left = e.clientX-xOffset +"px"; // adjust location of dragged object so doesn't jump to mouse position
dragObj.style.top = e.clientY-yOffset +"px";
} else if(e.type=="touchmove") {
dragObj.style.left = e.targetTouches[0].clientX-xOffset +"px"; // adjust location of dragged object so doesn't jump to mouse position
dragObj.style.top = e.targetTouches[0].clientY-yOffset +"px";
}
}
/*End dragging*/
document.onmouseup = function(e) {
if (dragObj) {
dragObj = null;
window.removeEventListener('mousemove', dragObject, true);
window.removeEventListener('touchmove', dragObject, true);
}
}
}
makeDragable('#shell_03header', '#shell_03')
function makeDragable2(dragHandle2, dragTarget2) {
let dragObj2 = null; //object to be moved
let xOffset2 = 0; //used to prevent dragged object jumping to mouse location
let yOffset2 = 0;
document.querySelector(dragHandle).addEventListener("mousedown", startDrag, true);
document.querySelector(dragHandle).addEventListener("touchstart", startDrag, true);
/*sets offset parameters and starts listening for mouse-move*/
function startDrag(x) {
e.preventDefault();
e.stopPropagation();
dragObj2 = document.querySelector(dragTarget);
dragObj2.style.position = "absolute";
let rect = dragObj2.getBoundingClientRect();
if (x.type=="mousedown") {
xOffset2 = x.clientX - rect.left; //clientX and getBoundingClientRect() both use viewable area adjusted when scrolling aka 'viewport'
yOffset2 = x.clientY - rect.top;
window.addEventListener('mousemove', dragObject2, true);
} else if(e.type=="touchstart") {
xOffset2 = x.targetTouches[0].clientX - rect.left;
yOffset2 = x.targetTouches[0].clientY - rect.top;
window.addEventListener('touchmove', dragObject2, true);
}
}
/*Drag object*/
function dragObject(x) {
x.preventDefault();
x.stopPropagation();
if(dragObj == null) {
return; // if there is no object being dragged then do nothing
} else if(x.type=="mousemove") {
dragObj2.style.left = x.clientX-xOffset2 +"px"; // adjust location of dragged object so doesn't jump to mouse position
dragObj2.style.top = x.clientY-yOffset2 +"px";
} else if(e.type=="touchmove") {
dragObj2.style.left = x.targetTouches[0].clientX-xOffset2 +"px"; // adjust location of dragged object so doesn't jump to mouse position
dragObj2.style.top = x.targetTouches[0].clientY-yOffset2 +"px";
}
}
/*End dragging*/
document.onmouseup = function(x) {
if (dragObj2) {
dragObj2 = null;
window.removeEventListener('mousemove', dragObject, true);
window.removeEventListener('touchmove', dragObject, true);
}
}
}
makeDragable2('#week_05header', '#week_05')