Jquery ui jQueryUI拖动时自动滚动
我有三个列表,一个可以拖动,另两个可以拖放。右侧列表可能有滚动条,也可能没有滚动条,但始终有2个或更多滚动条 我发现的第一个问题是,当最上面的列表有一个滚动条,而您试图在第二个列表中删除一个项目时,会触发两个事件。一个用于隐藏列表,一个用于可见列表Jquery ui jQueryUI拖动时自动滚动,jquery-ui,draggable,Jquery Ui,Draggable,我有三个列表,一个可以拖动,另两个可以拖放。右侧列表可能有滚动条,也可能没有滚动条,但始终有2个或更多滚动条 我发现的第一个问题是,当最上面的列表有一个滚动条,而您试图在第二个列表中删除一个项目时,会触发两个事件。一个用于隐藏列表,一个用于可见列表 第二个问题是,当其中一个列表具有滚动条时,当用户将项目拖动到其中时,它不会自动滚动。我认为您需要修改可拖放的并以这种方式修改一些行为: 您需要添加一个选项来定义是否应该使用可拖放的 是否可滚动 然后,您将需要某种验证,以确定哪个droppable
第二个问题是,当其中一个列表具有滚动条时,当用户将项目拖动到其中时,它不会自动滚动。我认为您需要修改可拖放的
并以这种方式修改一些行为:
- 您需要添加一个选项来定义是否应该使用
可拖放的
是否可滚动李>
- 然后,您将需要某种验证,以确定哪个
droppable
是否可见
- 您还需要调整一些应用程序中已经存在的滚动行为
jQueryUI的
widgets
这并不完美,但应该给你一些想法:
$.widget('ui.droppable', $.ui.droppable, {
_over: function (e, ui) {
var draggable = $.ui.ddmanager.current;
if (!draggable || (draggable.currentItem || draggable.element)[0] == this.element[0]) return; // Bail if draggable and droppable are same element
// this to make sure the droppable is visible
this.scrollVisible = this._isScrollIntoView();
if (this.accept.call(this.element[0], (draggable.currentItem || draggable.element)) && (!this.options.scrollable || this.scrollVisible)) {
if (this.options.hoverClass) {
this.element.addClass(this.options.hoverClass);
}
// to activate scrollable you need to change scrollParent of the draggable
// and adjust some calculations
if (this.options.scrollable) {
draggable.overflowOffset = $(this.element).scrollParent().offset();
draggable.scrollParent = $(this.element).scrollParent();
draggable.offsetParent = $(this.element).scrollParent();
draggable.offset.parent.top = $(this.element).scrollParent().scrollTop();
}
this._trigger('over', event, this.ui(draggable));
}
},
_out: function (event) {
this._super();
var draggable = $.ui.ddmanager.current;
// remove scrollable
if (this.options.scrollable) {
draggable.scrollParent = $(document);
draggable.offsetParent = $(document);
draggable.overflowOffset = $(document).offset();
draggable.offset.parent.top = $(document).scrollTop();
}
},
_drop: function (event, custom) {
var draggable = custom || $.ui.ddmanager.current;
if (!draggable || (draggable.currentItem || draggable.element)[0] == this.element[0]) return false; // Bail if draggable and droppable are same element
var childrenIntersection = false;
this.element.find(":data(droppable)").not(".ui-draggable-dragging").each(function () {
var inst = $.data(this, 'droppable');
if (
inst.options.greedy && !inst.options.disabled && inst.options.scope == draggable.options.scope && inst.accept.call(inst.element[0], (draggable.currentItem || draggable.element)) && $.ui.intersect(draggable, $.extend(inst, {
offset: inst.element.offset()
}), inst.options.tolerance)) {
childrenIntersection = true;
return false;
}
});
if (childrenIntersection) return false;
// same as for over, you need to validate visibility of the element
this.scrollVisible = this._isScrollIntoView();
if (this.accept.call(this.element[0], (draggable.currentItem || draggable.element)) && (!this.options.scrollable || this.scrollVisible)) {
if (this.options.activeClass) this.element.removeClass(this.options.activeClass);
if (this.options.hoverClass) this.element.removeClass(this.options.hoverClass);
this._trigger('drop', event, this.ui(draggable));
return this.element;
}
return false;
},
// a function to check visibility. Taken here:
//http://stackoverflow.com/questions/487073/check-if-element-is-visible-after-scrolling
_isScrollIntoView() {
var $elem = $(this.element);
var $parent = $(this.element).scrollParent();
var docViewTop = $parent.parent().scrollTop();
var docViewBottom = docViewTop + $parent.parent().height();
var elemTop = $elem.offset().top;
var elemBottom = elemTop + $elem.height();
return ((elemBottom <= docViewBottom) && (elemTop >= docViewTop));
}
});
$(document).ready(function () {
$(".left ul li").draggable({
refreshPosition: true,
revert: true,
});
$(".right .top li").droppable({
scrollable: true,
drop: function (e, ui) {
alert(ui.draggable.text() + " " + $(this).text());
}
});
$(".right .bottom li").droppable({
scrollable: false,
drop: function (e, ui) {
alert(ui.draggable.text() + " " + $(this).text());
}
});
});
$.widget('ui.droppable',$.ui.droppable{
_结束:功能(e、ui){
var draggable=$.ui.ddmanager.current;
如果(!draggable | | |(draggable.currentItem | | draggable.element)[0]==this.element[0])返回;//如果draggable和dropable是同一个元素
//这是为了确保可拖放文件可见
this.scrollVisible=this.\u iscrollintoView();
if(this.accept.call(this.element[0],(draggable.currentItem | | | | draggable.element))&&(!this.options.scrollable | | this.scrollVisible)){
if(this.options.hoverClass){
this.element.addClass(this.options.hoverClass);
}
//要激活scrollable,您需要更改DragTable的ScrollabParent
//并调整一些计算
if(this.options.scrollable){
draggable.overflowOffset=$(this.element.scrollParent().offset();
DragTable.scrollParent=$(this.element).scrollParent();
DragTable.offsetParent=$(this.element).scrollParent();
draggable.offset.parent.top=$(this.element).scrollParent().scrollTop();
}
this._触发器('over',事件,this.ui(可拖动));
}
},
_输出:功能(事件){
这个;
var draggable=$.ui.ddmanager.current;
//删除可滚动的
if(this.options.scrollable){
draggable.scrollParent=$(文档);
draggable.offsetParent=$(文档);
draggable.overflowOffset=$(document.offset();
draggable.offset.parent.top=$(document.scrollTop();
}
},
_drop:函数(事件、自定义){
var draggable=custom | |$.ui.ddmanager.current;
如果(!draggable | | |(draggable.currentItem | | draggable.element)[0]==this.element[0])返回false;//如果draggable和dropable是同一个元素,则返回Bail
var childrenIntersection=false;
this.element.find(“:data(droppable)”).not(“.ui可拖动”).each(函数(){
var inst=$.data(这是“可拖放的”);
如果(
inst.options.greedy&&!inst.options.disabled&&inst.options.scope==draggable.options.scope&&inst.accept.call(inst.element[0],(draggable.currentItem | | draggable.element))&&&$.ui.intersect(draggable,$.extend(inst{
偏移量:inst.element.offset()
}),安装选项(公差)){
childrencrossion=true;
返回false;
}
});
if(childrencrossion)返回false;
//与上相同,您需要验证元素的可见性
this.scrollVisible=this.\u iscrollintoView();
if(this.accept.call(this.element[0],(draggable.currentItem | | | | draggable.element))&&(!this.options.scrollable | | this.scrollVisible)){
if(this.options.activeClass)this.element.removeClass(this.options.activeClass);
if(this.options.hoverClass)this.element.removeClass(this.options.hoverClass);
this._触发器('drop',event,this.ui(可拖动));
返回此.element;
}
返回false;
},
//用于检查可见性的函数。在此处获取:
//http://stackoverflow.com/questions/487073/check-if-element-is-visible-after-scrolling
_IsCrollintoView(){
var$elem=$(this.element);
var$parent=$(this.element).scrollParent();
var docViewTop=$parent.parent().scrollTop();
var docViewBottom=docViewTop+$parent.parent().height();
var elemTop=$elem.offset().top;
var elemBottom=elemTop+$elem.height();
返回((elemBottom=docViewTop));
}
});
$(文档).ready(函数(){
$(“.left ul li”)。可拖动({
立场:对,,
回复:对,
});
$(“.right.top li”)。可拖放({
可滚动:对,
drop:函数(e、ui){
警报(ui.draggable.text()+“”+$(this.text());
}
});
$(“.right.bottom li”)。可拖放({
可滚动:false,
drop:函数(e、ui){
警报(ui.draggable.text()+“”+$(this.text());
}
});
});
这肯定会让我接近。谢谢你的帮助。
$.widget('ui.droppable', $.ui.droppable, {
_over: function (e, ui) {
var draggable = $.ui.ddmanager.current;
if (!draggable || (draggable.currentItem || draggable.element)[0] == this.element[0]) return; // Bail if draggable and droppable are same element
// this to make sure the droppable is visible
this.scrollVisible = this._isScrollIntoView();
if (this.accept.call(this.element[0], (draggable.currentItem || draggable.element)) && (!this.options.scrollable || this.scrollVisible)) {
if (this.options.hoverClass) {
this.element.addClass(this.options.hoverClass);
}
// to activate scrollable you need to change scrollParent of the draggable
// and adjust some calculations
if (this.options.scrollable) {
draggable.overflowOffset = $(this.element).scrollParent().offset();
draggable.scrollParent = $(this.element).scrollParent();
draggable.offsetParent = $(this.element).scrollParent();
draggable.offset.parent.top = $(this.element).scrollParent().scrollTop();
}
this._trigger('over', event, this.ui(draggable));
}
},
_out: function (event) {
this._super();
var draggable = $.ui.ddmanager.current;
// remove scrollable
if (this.options.scrollable) {
draggable.scrollParent = $(document);
draggable.offsetParent = $(document);
draggable.overflowOffset = $(document).offset();
draggable.offset.parent.top = $(document).scrollTop();
}
},
_drop: function (event, custom) {
var draggable = custom || $.ui.ddmanager.current;
if (!draggable || (draggable.currentItem || draggable.element)[0] == this.element[0]) return false; // Bail if draggable and droppable are same element
var childrenIntersection = false;
this.element.find(":data(droppable)").not(".ui-draggable-dragging").each(function () {
var inst = $.data(this, 'droppable');
if (
inst.options.greedy && !inst.options.disabled && inst.options.scope == draggable.options.scope && inst.accept.call(inst.element[0], (draggable.currentItem || draggable.element)) && $.ui.intersect(draggable, $.extend(inst, {
offset: inst.element.offset()
}), inst.options.tolerance)) {
childrenIntersection = true;
return false;
}
});
if (childrenIntersection) return false;
// same as for over, you need to validate visibility of the element
this.scrollVisible = this._isScrollIntoView();
if (this.accept.call(this.element[0], (draggable.currentItem || draggable.element)) && (!this.options.scrollable || this.scrollVisible)) {
if (this.options.activeClass) this.element.removeClass(this.options.activeClass);
if (this.options.hoverClass) this.element.removeClass(this.options.hoverClass);
this._trigger('drop', event, this.ui(draggable));
return this.element;
}
return false;
},
// a function to check visibility. Taken here:
//http://stackoverflow.com/questions/487073/check-if-element-is-visible-after-scrolling
_isScrollIntoView() {
var $elem = $(this.element);
var $parent = $(this.element).scrollParent();
var docViewTop = $parent.parent().scrollTop();
var docViewBottom = docViewTop + $parent.parent().height();
var elemTop = $elem.offset().top;
var elemBottom = elemTop + $elem.height();
return ((elemBottom <= docViewBottom) && (elemTop >= docViewTop));
}
});
$(document).ready(function () {
$(".left ul li").draggable({
refreshPosition: true,
revert: true,
});
$(".right .top li").droppable({
scrollable: true,
drop: function (e, ui) {
alert(ui.draggable.text() + " " + $(this).text());
}
});
$(".right .bottom li").droppable({
scrollable: false,
drop: function (e, ui) {
alert(ui.draggable.text() + " " + $(this).text());
}
});
});