138 lines
3.7 KiB
JavaScript
138 lines
3.7 KiB
JavaScript
addEvent(window, 'load', reorder_init);
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var lis;
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var top = 90;
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var left = 545;
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var height = 30;
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function reorder_init() {
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lis = document.getElementsBySelector('ul#orderthese li');
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var input = document.getElementsBySelector('input[name=order_]')[0];
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setOrder(input.value.split(','));
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input.disabled = true;
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draw();
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// Now initialise the dragging behaviour
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var limit = (lis.length - 1) * height;
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for (var i = 0; i < lis.length; i++) {
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var li = lis[i];
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var img = document.getElementById('handle'+li.id);
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li.style.zIndex = 1;
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Drag.init(img, li, left + 10, left + 10, top + 10, top + 10 + limit);
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li.onDragStart = startDrag;
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li.onDragEnd = endDrag;
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img.style.cursor = 'move';
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}
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}
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function submitOrderForm() {
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var inputOrder = document.getElementsBySelector('input[name=order_]')[0];
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inputOrder.value = getOrder();
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inputOrder.disabled=false;
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}
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function startDrag() {
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this.style.zIndex = '10';
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this.className = 'dragging';
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}
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function endDrag(x, y) {
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this.style.zIndex = '1';
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this.className = '';
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// Work out how far along it has been dropped, using x co-ordinate
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var oldIndex = this.index;
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var newIndex = Math.round((y - 10 - top) / height);
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// 'Snap' to the correct position
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this.style.top = (10 + top + newIndex * height) + 'px';
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this.index = newIndex;
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moveItem(oldIndex, newIndex);
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}
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function moveItem(oldIndex, newIndex) {
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// Swaps two items, adjusts the index and left co-ord for all others
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if (oldIndex == newIndex) {
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return; // Nothing to swap;
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}
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var direction, lo, hi;
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if (newIndex > oldIndex) {
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lo = oldIndex;
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hi = newIndex;
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direction = -1;
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} else {
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direction = 1;
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hi = oldIndex;
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lo = newIndex;
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}
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var lis2 = new Array(); // We will build the new order in this array
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for (var i = 0; i < lis.length; i++) {
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if (i < lo || i > hi) {
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// Position of items not between the indexes is unaffected
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lis2[i] = lis[i];
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continue;
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} else if (i == newIndex) {
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lis2[i] = lis[oldIndex];
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continue;
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} else {
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// Item is between the two indexes - move it along 1
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lis2[i] = lis[i - direction];
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}
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}
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// Re-index everything
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reIndex(lis2);
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lis = lis2;
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draw();
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// document.getElementById('hiddenOrder').value = getOrder();
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document.getElementsBySelector('input[name=order_]')[0].value = getOrder();
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}
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function reIndex(lis) {
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for (var i = 0; i < lis.length; i++) {
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lis[i].index = i;
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}
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}
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function draw() {
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for (var i = 0; i < lis.length; i++) {
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var li = lis[i];
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li.index = i;
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li.style.position = 'absolute';
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li.style.left = (10 + left) + 'px';
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li.style.top = (10 + top + (i * height)) + 'px';
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}
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}
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function getOrder() {
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var order = new Array(lis.length);
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for (var i = 0; i < lis.length; i++) {
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order[i] = lis[i].id.substring(1, 100);
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}
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return order.join(',');
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}
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function setOrder(id_list) {
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/* Set the current order to match the lsit of IDs */
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var temp_lis = new Array();
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for (var i = 0; i < id_list.length; i++) {
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var id = 'p' + id_list[i];
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temp_lis[temp_lis.length] = document.getElementById(id);
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}
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reIndex(temp_lis);
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lis = temp_lis;
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draw();
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}
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function addEvent(elm, evType, fn, useCapture)
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// addEvent and removeEvent
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// cross-browser event handling for IE5+, NS6 and Mozilla
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// By Scott Andrew
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{
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if (elm.addEventListener){
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elm.addEventListener(evType, fn, useCapture);
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return true;
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} else if (elm.attachEvent){
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var r = elm.attachEvent("on"+evType, fn);
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return r;
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} else {
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elm['on'+evType] = fn;
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}
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}
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