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深究AngularJS中ng-drag、ng-drop的用法

时间:2018-07-27 18:42来源:网络整理 作者:51自学网
1.相关地址: 插件下载:https://github.com/fatlinesofcode/ngDraggable/blob/master/ngDraggable.js 2.讲解 div ng-drop="true" ng-drop-success="dropComplete($index,$data,$event)" ng-repeat="item in content" li ng-drag="true" ng-drag-

1.相关地址:

插件下载:https://github.com/fatlinesofcode/ngDraggable/blob/master/ngDraggable.js

2.讲解

<div ng-drop="true" ng-drop-success="dropComplete($index,$data,$event)" ng-repeat="item in content"> <li ng-drag="true" ng-drag-data="item" > 姓名:{{item.name}},年龄:{{item.age}} </li> </div>

ng-drag : 表示该元素能够被拖动

ng-drag-data : 表示拖动元素时跟着被拖走的数据

ng-drop : 表示该元素内可放置被拖动的元素

ng-drop-success : 放置在ngd-drop所在元素里后触发,一般写事件.

ng-drop-success触发的dropComplete方法的参数说明:

  • $index : 表示拖动的数据所落的元素的下标
  • $data : 被拖动的数据对象
  • 3.拖拽排序示例

    页面代码

    <div ng-drop="true" ng-drop-success="dropComplete($index,$data)" ng-repeat="item in content"> <li ng-drag="true" ng-drag-data="item" > 姓名:{{item.name}},年龄:{{item.age}} </li> </div>

    js代码

    //数据 $scope.content = [{'name':'张春玲','age':28},{'name':'王晰','age':26},{'name':'吴正青','age':66}]; /** 拖拽成功触发方法 * index 拖拽后落下时的元素的序号(下标) * obj被拖动数据对象 */ $scope.dropComplete = function(index, obj){ //重新排序 var idx = $scope.content.indexOf(obj); $scope.content.splice(idx,1); $scope.content.splice(index,0,obj); };

    4.拖拽交换示例

    页面代码

    <div ng-drop="true" ng-drop-success="dropComplete($index,$data)" ng-repeat="item in content"> <li ng-drag="true" ng-drag-data="item" > 姓名:{{item.name}},年龄:{{item.age}} </li> </div>

    JS代码

    //数据 $scope.content = [{'name':'张春玲','age':28},{'name':'王晰','age':26},{'name':'吴正青','age':66}]; /** 拖拽成功触发方法 * index 拖拽后落下时的元素的序号(下标) * obj 被拖动数据对象 */ $scope.dropComplete = function(index, obj){ var idx = $scope.content.indexOf(obj); $scope.content[idx] = $scope.content[index]; $scope.content[index] = obj; }; 5. ngDraggable插件代码 /* * * https://github.com/fatlinesofcode/ngDraggable */ angular.module("ngDraggable", []) .service('ngDraggable', [function() { var scope = this; scope.inputEvent = function(event) { if (angular.isDefined(event.touches)) { return event.touches[0]; } //Checking both is not redundent. If only check if touches isDefined, angularjs isDefnied will return error and stop the remaining scripty if event.originalEvent is not defined. else if (angular.isDefined(event.originalEvent) && angular.isDefined(event.originalEvent.touches)) { return event.originalEvent.touches[0]; } return event; }; }]) .directive('ngDrag', ['$rootScope', '$parse', '$document', '$window', 'ngDraggable', function ($rootScope, $parse, $document, $window, ngDraggable) { return { restrict: 'A', link: function (scope, element, attrs) { scope.value = attrs.ngDrag; var offset,_centerAnchor=false,_mx,_my,_tx,_ty,_mrx,_mry; var _hasTouch = ('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch; var _pressEvents = 'touchstart mousedown'; var _moveEvents = 'touchmove mousemove'; var _releaseEvents = 'touchend mouseup'; var _dragHandle; // to identify the element in order to prevent getting superflous events when a single element has both drag and drop directives on it. var _myid = scope.$id; var _data = null; var _dragOffset = null; var _dragEnabled = false; var _pressTimer = null; var onDragStartCallback = $parse(attrs.ngDragStart) || null; var onDragStopCallback = $parse(attrs.ngDragStop) || null; var onDragSuccessCallback = $parse(attrs.ngDragSuccess) || null; var allowTransform = angular.isDefined(attrs.allowTransform) ? scope.$eval(attrs.allowTransform) : true; var getDragData = $parse(attrs.ngDragData); // deregistration function for mouse move events in $rootScope triggered by jqLite trigger handler var _deregisterRootMoveListener = angular.noop; var initialize = function () { element.attr('draggable', 'false'); // prevent native drag // check to see if drag handle(s) was specified // if querySelectorAll is available, we use this instead of find // as JQLite find is limited to tagnames if (element[0].querySelectorAll) { var dragHandles = angular.element(element[0].querySelectorAll('[ng-drag-handle]')); } else { var dragHandles = element.find('[ng-drag-handle]'); } if (dragHandles.length) { _dragHandle = dragHandles; } toggleListeners(true); }; var toggleListeners = function (enable) { if (!enable)return; // add listeners. scope.$on('$destroy', onDestroy); scope.$watch(attrs.ngDrag, onEnableChange); scope.$watch(attrs.ngCenterAnchor, onCenterAnchor); // wire up touch events if (_dragHandle) { // handle(s) specified, use those to initiate drag _dragHandle.on(_pressEvents, onpress); } else { // no handle(s) specified, use the element as the handle element.on(_pressEvents, onpress); } if(! _hasTouch && element[0].nodeName.toLowerCase() == "img"){ element.on('mousedown', function(){ return false;}); // prevent native drag for images } }; var onDestroy = function (enable) { toggleListeners(false); }; var onEnableChange = function (newVal, oldVal) { _dragEnabled = (newVal); }; var onCenterAnchor = function (newVal, oldVal) { if(angular.isDefined(newVal)) _centerAnchor = (newVal || 'true'); }; var isClickableElement = function (evt) { return ( angular.isDefined(angular.element(evt.target).attr("ng-cancel-drag")) ); }; /* * When the element is clicked start the drag behaviour * On touch devices as a small delay so as not to prevent native window scrolling */ var onpress = function(evt) { if(! _dragEnabled)return; if (isClickableElement(evt)) { return; } if (evt.type == "mousedown" && evt.button != 0) { // Do not start dragging on right-click return; } if(_hasTouch){ cancelPress(); _pressTimer = setTimeout(function(){ cancelPress(); onlongpress(evt); },100); $document.on(_moveEvents, cancelPress); $document.on(_releaseEvents, cancelPress); }else{ onlongpress(evt); } }; var cancelPress = function() { clearTimeout(_pressTimer); $document.off(_moveEvents, cancelPress); $document.off(_releaseEvents, cancelPress); }; var onlongpress = function(evt) { if(! _dragEnabled)return; evt.preventDefault(); offset = element[0].getBoundingClientRect(); if(allowTransform) _dragOffset = offset; else{ _dragOffset = {left:document.body.scrollLeft, top:document.body.scrollTop}; } element.centerX = element[0].offsetWidth / 2; element.centerY = element[0].offsetHeight / 2; _mx = ngDraggable.inputEvent(evt).pageX;//ngDraggable.getEventProp(evt, 'pageX'); _my = ngDraggable.inputEvent(evt).pageY;//ngDraggable.getEventProp(evt, 'pageY'); _mrx = _mx - offset.left; _mry = _my - offset.top; if (_centerAnchor) { _tx = _mx - element.centerX - $window.pageXOffset; _ty = _my - element.centerY - $window.pageYOffset; } else { _tx = _mx - _mrx - $window.pageXOffset; _ty = _my - _mry - $window.pageYOffset; } $document.on(_moveEvents, onmove); $document.on(_releaseEvents, onrelease); // This event is used to receive manually triggered mouse move events // jqLite unfortunately only supports triggerHandler(...) // See // _deregisterRootMoveListener = $rootScope.$on('draggable:_triggerHandlerMove', onmove); _deregisterRootMoveListener = $rootScope.$on('draggable:_triggerHandlerMove', function(event, origEvent) { onmove(origEvent); }); }; var onmove = function (evt) { if (!_dragEnabled)return; evt.preventDefault(); if (!element.hasClass('dragging')) { _data = getDragData(scope); element.addClass('dragging'); $rootScope.$broadcast('draggable:start', {x:_mx, y:_my, tx:_tx, ty:_ty, event:evt, element:element, data:_data}); if (onDragStartCallback ){ scope.$apply(function () { onDragStartCallback(scope, {$data: _data, $event: evt}); }); } } _mx = ngDraggable.inputEvent(evt).pageX;//ngDraggable.getEventProp(evt, 'pageX'); _my = ngDraggable.inputEvent(evt).pageY;//ngDraggable.getEventProp(evt, 'pageY'); if (_centerAnchor) { _tx = _mx - element.centerX - _dragOffset.left; _ty = _my - element.centerY - _dragOffset.top; } else { _tx = _mx - _mrx - _dragOffset.left; _ty = _my - _mry - _dragOffset.top; } moveElement(_tx, _ty); $rootScope.$broadcast('draggable:move', { x: _mx, y: _my, tx: _tx, ty: _ty, event: evt, element: element, data: _data, uid: _myid, dragOffset: _dragOffset }); }; var onrelease = function(evt) { if (!_dragEnabled) return; evt.preventDefault(); $rootScope.$broadcast('draggable:end', {x:_mx, y:_my, tx:_tx, ty:_ty, event:evt, element:element, data:_data, callback:onDragComplete, uid: _myid}); element.removeClass('dragging'); element.parent().find('.drag-enter').removeClass('drag-enter'); reset(); $document.off(_moveEvents, onmove); $document.off(_releaseEvents, onrelease); if (onDragStopCallback ){ scope.$apply(function () { onDragStopCallback(scope, {$data: _data, $event: evt}); }); } _deregisterRootMoveListener(); }; var onDragComplete = function(evt) { if (!onDragSuccessCallback )return; scope.$apply(function () { onDragSuccessCallback(scope, {$data: _data, $event: evt}); }); }; var reset = function() { if(allowTransform) element.css({transform:'', 'z-index':'', '-webkit-transform':'', '-ms-transform':''}); else element.css({'position':'',top:'',left:''}); }; var moveElement = function (x, y) { if(allowTransform) { element.css({ transform: 'matrix3d(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, ' + x + ', ' + y + ', 0, 1)', 'z-index': 99999, '-webkit-transform': 'matrix3d(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, ' + x + ', ' + y + ', 0, 1)', '-ms-transform': 'matrix(1, 0, 0, 1, ' + x + ', ' + y + ')' }); }else{ element.css({'left':x+'px','top':y+'px', 'position':'fixed'}); } }; initialize(); } }; }]) .directive('ngDrop', ['$parse', '$timeout', '$window', '$document', 'ngDraggable', function ($parse, $timeout, $window, $document, ngDraggable) { return { restrict: 'A', link: function (scope, element, attrs) { scope.value = attrs.ngDrop; scope.isTouching = false; var _lastDropTouch=null; var _myid = scope.$id; var _dropEnabled=false; var onDropCallback = $parse(attrs.ngDropSuccess);// || function(){}; var onDragStartCallback = $parse(attrs.ngDragStart); var onDragStopCallback = $parse(attrs.ngDragStop); var onDragMoveCallback = $parse(attrs.ngDragMove); var initialize = function () { toggleListeners(true); }; var toggleListeners = function (enable) { // remove listeners if (!enable)return; // add listeners. scope.$watch(attrs.ngDrop, onEnableChange); scope.$on('$destroy', onDestroy); scope.$on('draggable:start', onDragStart); scope.$on('draggable:move', onDragMove); scope.$on('draggable:end', onDragEnd); }; var onDestroy = function (enable) { toggleListeners(false); }; var onEnableChange = function (newVal, oldVal) { _dropEnabled=newVal; }; var onDragStart = function(evt, obj) { if(! _dropEnabled)return; isTouching(obj.x,obj.y,obj.element); if (attrs.ngDragStart) { $timeout(function(){ onDragStartCallback(scope, {$data: obj.data, $event: obj}); }); } }; var onDragMove = function(evt, obj) { if(! _dropEnabled)return; isTouching(obj.x,obj.y,obj.element); if (attrs.ngDragMove) { $timeout(function(){ onDragMoveCallback(scope, {$data: obj.data, $event: obj}); }); } }; var onDragEnd = function (evt, obj) { // don't listen to drop events if this is the element being dragged // only update the styles and return if (!_dropEnabled || _myid === obj.uid) { updateDragStyles(false, obj.element); return; } if (isTouching(obj.x, obj.y, obj.element)) { // call the ngDraggable ngDragSuccess element callback if(obj.callback){ obj.callback(obj); } if (attrs.ngDropSuccess) { $timeout(function(){ onDropCallback(scope, {$data: obj.data, $event: obj, $target: scope.$eval(scope.value)}); }); } } if (attrs.ngDragStop) { $timeout(function(){ onDragStopCallback(scope, {$data: obj.data, $event: obj}); }); } updateDragStyles(false, obj.element); }; var isTouching = function(mouseX, mouseY, dragElement) { var touching= hitTest(mouseX, mouseY); scope.isTouching = touching; if(touching){ _lastDropTouch = element; } updateDragStyles(touching, dragElement); return touching; }; var updateDragStyles = function(touching, dragElement) { if(touching){ element.addClass('drag-enter'); dragElement.addClass('drag-over'); }else if(_lastDropTouch == element){ _lastDropTouch=null; element.removeClass('drag-enter'); dragElement.removeClass('drag-over'); } }; var hitTest = function(x, y) { var bounds = element[0].getBoundingClientRect();// ngDraggable.getPrivOffset(element); x -= $document[0].body.scrollLeft + $document[0].documentElement.scrollLeft; y -= $document[0].body.scrollTop + $document[0].documentElement.scrollTop; return x >= bounds.left && x <= bounds.right && y <= bounds.bottom && y >= bounds.top; }; initialize(); } }; }]) .directive('ngDragClone', ['$parse', '$timeout', 'ngDraggable', function ($parse, $timeout, ngDraggable) { return { restrict: 'A', link: function (scope, element, attrs) { var img, _allowClone=true; var _dragOffset = null; scope.clonedData = {}; var initialize = function () { img = element.find('img'); element.attr('draggable', 'false'); img.attr('draggable', 'false'); reset(); toggleListeners(true); }; var toggleListeners = function (enable) { // remove listeners if (!enable)return; // add listeners. scope.$on('draggable:start', onDragStart); scope.$on('draggable:move', onDragMove); scope.$on('draggable:end', onDragEnd); preventContextMenu(); }; var preventContextMenu = function() { // element.off('mousedown touchstart touchmove touchend touchcancel', absorbEvent_); img.off('mousedown touchstart touchmove touchend touchcancel', absorbEvent_); // element.on('mousedown touchstart touchmove touchend touchcancel', absorbEvent_); img.on('mousedown touchstart touchmove touchend touchcancel', absorbEvent_); }; var onDragStart = function(evt, obj, elm) { _allowClone=true; if(angular.isDefined(obj.data.allowClone)){ _allowClone=obj.data.allowClone; } if(_allowClone) { scope.$apply(function () { scope.clonedData = obj.data; }); element.css('width', obj.element[0].offsetWidth); element.css('height', obj.element[0].offsetHeight); moveElement(obj.tx, obj.ty); } }; var onDragMove = function(evt, obj) { if(_allowClone) { _tx = obj.tx + obj.dragOffset.left; _ty = obj.ty + obj.dragOffset.top; moveElement(_tx, _ty); } }; var onDragEnd = function(evt, obj) { //moveElement(obj.tx,obj.ty); if(_allowClone) { reset(); } }; var reset = function() { element.css({left:0,top:0, position:'fixed', 'z-index':-1, visibility:'hidden'}); }; var moveElement = function(x,y) { element.css({ transform: 'matrix3d(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, '+x+', '+y+', 0, 1)', 'z-index': 99999, 'visibility': 'visible', '-webkit-transform': 'matrix3d(1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, '+x+', '+y+', 0, 1)', '-ms-transform': 'matrix(1, 0, 0, 1, '+x+', '+y+')' //,margin: '0' don't monkey with the margin, }); }; var absorbEvent_ = function (event) { var e = event;//.originalEvent; e.preventDefault && e.preventDefault(); e.stopPropagation && e.stopPropagation(); e.cancelBubble = true; e.returnValue = false; return false; }; initialize(); } }; }]) .directive('ngPreventDrag', ['$parse', '$timeout', function ($parse, $timeout) { return { restrict: 'A', link: function (scope, element, attrs) { var initialize = function () { element.attr('draggable', 'false'); toggleListeners(true); }; var toggleListeners = function (enable) { // remove listeners if (!enable)return; // add listeners. element.on('mousedown touchstart touchmove touchend touchcancel', absorbEvent_); }; var absorbEvent_ = function (event) { var e = event.originalEvent; e.preventDefault && e.preventDefault(); e.stopPropagation && e.stopPropagation(); e.cancelBubble = true; e.returnValue = false; return false; }; initialize(); } }; }]) .directive('ngCancelDrag', [function () { return { restrict: 'A', link: function (scope, element, attrs) { element.find('*').attr('ng-cancel-drag', 'ng-cancel-drag'); } }; }]) .directive('ngDragScroll', ['$window', '$interval', '$timeout', '$document', '$rootScope', function($window, $interval, $timeout, $document, $rootScope) { return { restrict: 'A', link: function(scope, element, attrs) { var intervalPromise = null; var lastMouseEvent = null; var config = { verticalScroll: attrs.verticalScroll || true, horizontalScroll: attrs.horizontalScroll || true, activationDistance: attrs.activationDistance || 75, scrollDistance: attrs.scrollDistance || 15 }; var reqAnimFrame = (function() { return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function( /* function FrameRequestCallback */ callback, /* DOMElement Element */ element ) { window.setTimeout(callback, 1000 / 60); }; })(); var animationIsOn = false; var createInterval = function() { animationIsOn = true; function nextFrame(callback) { var args = Array.prototype.slice.call(arguments); if(animationIsOn) { reqAnimFrame(function () { $rootScope.$apply(function () { callback.apply(null, args); nextFrame(callback); }); }) } } nextFrame(function() { if (!lastMouseEvent) return; var viewportWidth = Math.max(document.documentElement.clientWidth, window.innerWidth || 0); var viewportHeight = Math.max(document.documentElement.clientHeight, window.innerHeight || 0); var scrollX = 0; var scrollY = 0; if (config.horizontalScroll) { // If horizontal scrolling is active. if (lastMouseEvent.clientX < config.activationDistance) { // If the mouse is on the left of the viewport within the activation distance. scrollX = -config.scrollDistance; } else if (lastMouseEvent.clientX > viewportWidth - config.activationDistance) { // If the mouse is on the right of the viewport within the activation distance. scrollX = config.scrollDistance; } } if (config.verticalScroll) { // If vertical scrolling is active. if (lastMouseEvent.clientY < config.activationDistance) { // If the mouse is on the top of the viewport within the activation distance. scrollY = -config.scrollDistance; } else if (lastMouseEvent.clientY > viewportHeight - config.activationDistance) { // If the mouse is on the bottom of the viewport within the activation distance. scrollY = config.scrollDistance; } } if (scrollX !== 0 || scrollY !== 0) { // Record the current scroll position. var currentScrollLeft = ($window.pageXOffset || $document[0].documentElement.scrollLeft); var currentScrollTop = ($window.pageYOffset || $document[0].documentElement.scrollTop); // Remove the transformation from the element, scroll the window by the scroll distance // record how far we scrolled, then reapply the element transformation. var elementTransform = element.css('transform'); element.css('transform', 'initial'); $window.scrollBy(scrollX, scrollY); var horizontalScrollAmount = ($window.pageXOffset || $document[0].documentElement.scrollLeft) - currentScrollLeft; var verticalScrollAmount = ($window.pageYOffset || $document[0].documentElement.scrollTop) - currentScrollTop; element.css('transform', elementTransform); lastMouseEvent.pageX += horizontalScrollAmount; lastMouseEvent.pageY += verticalScrollAmount; $rootScope.$emit('draggable:_triggerHandlerMove', lastMouseEvent); } }); }; var clearInterval = function() { animationIsOn = false; }; scope.$on('draggable:start', function(event, obj) { // Ignore this event if it's not for this element. if (obj.element[0] !== element[0]) return; if (!animationIsOn) createInterval(); }); scope.$on('draggable:end', function(event, obj) { // Ignore this event if it's not for this element. if (obj.element[0] !== element[0]) return; if (animationIsOn) clearInterval(); }); scope.$on('draggable:move', function(event, obj) { // Ignore this event if it's not for this element. if (obj.element[0] !== element[0]) return; lastMouseEvent = obj.event; }); } }; }]);

    以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。

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