我希望能够通过拖放选择多个项目并将复制从列表中复制到另一个(双向),并且只有在它不存在的情况下才会删除... < / p>
一些帮助将不胜感激。
编辑:关于查理的帖子和小提琴,如何才能选择多个项目拖放到另一个列表?就像现在一样,它只能同时允许1个项目。
HTML:
<div class="list">
<h2>Stored procedures In DB 1</h2>
<ul class="list" data-bind="sortable: { data: storedProceduresInDB1, beforeMove: checkAndCopy }">
<li class="item" data-bind="text: Name"></li>
</ul>
</div><br>
<div class="list">
<h2>Stored procedures In DB 2</h2>
<ul class="list" data-bind="sortable: { data: storedProceduresInDB2, beforeMove: checkAndCopy }">
<li class="item" data-bind="text: Name"></li>
</ul>
</div>
代码:
var ViewModel = function () {
var self = this;
self.storedProceduresInDB1 = ko.observableArray([
{ Name: 'SP1', Id: 1 },
{ Name: 'SP2', Id: 2 },
{ Name: 'SP3', Id: 3 }
]);
self.storedProceduresInDB2 = ko.observableArray([
{ Name: 'SP3', Id: 3 },
{ Name: 'SP4', Id: 4 },
{ Name: 'SP5', Id: 5 }
]);
self.selectedStoredProcedureInDB1 = ko.observable();
self.selectedStoredProcedureInDB2 = ko.observable();
self.selectStoredProcedureInDB1 = function (sp) {
self.selectedStoredProcedureInDB1(sp);
};
self.selectStoredProcedureInDB2 = function (sp) {
self.selectedStoredProcedureInDB2(sp);
};
self.checkAndCopy = function(event) {
var targetHasItem = ko.utils.arrayFilter(event.targetParent(), function(item) {
return item.Id == event.item.Id;
}).length;
if(!targetHasItem) {
event.targetParent.splice(event.targetIndex, 0, event.item);
}
if(event.targetParent != event.sourceParent) {
event.cancelDrop = true;
}
};
};
ko.applyBindings(new ViewModel());
答案 0 :(得分:4)
注意:此答案仅允许一次排序一个项目。要一次排序多个项目,请参阅this solution。
我建议使用Ryan Niemeyer的knockout-sortable
绑定处理程序(https://github.com/rniemeyer/knockout-sortable),它处理了很多处理knockout和jQuery可以排序的怪癖。
如果使用knockout-sortable
,您可以使用beforeMove
回调取消放弃,并根据您的条件将副本添加到第二个列表。
JSFiddle working example,以下是相关部分:
<强> HTML 强>
注意我们传入一个对象的可排序绑定,该对象指定用于列表的数据,以及用于beforeMove
回调的方法。
<div class="list">
<h2>Stored procedures In DB 1</h2>
<ul class="list" data-bind="sortable: { data: storedProceduresInDB1, beforeMove: checkAndCopy }">
<li class="item" data-bind="text: Name"></li>
</ul>
</div>
<div class="list">
<h2>Stored procedures In DB 2</h2>
<ul class="list" data-bind="sortable: { data: storedProceduresInDB2, beforeMove: checkAndCopy }">
<li class="item" data-bind="text: Name"></li>
</ul>
</div>
<强>的JavaScript 强>
我们将此方法添加到视图模型中以检查目标列表是否已包含该项目,如果不存在则复制该项目,然后取消drop事件以使原始项目保留在其原始列表中。
self.checkAndCopy = function(event) {
var targetHasItem = ko.utils.arrayFilter(event.targetParent(), function(item) {
return item.Id == event.item.Id;
}).length;
if(!targetHasItem) {
event.targetParent.splice(event.targetIndex, 0, event.item);
}
// Only cancels drop if moving to new list to allow sorting within original list
if(event.targetParent != event.sourceParent) {
event.cancelDrop = true;
}
};
答案 1 :(得分:3)
这是一个允许一次排序多个项目的解决方案。基于this related answer,但已修改为使用knockout.js
和knockout-sortable
。
JSFiddle(在Chrome中测试):http://jsfiddle.net/QWgRF/715/
<强> HTML 强>
为可排序项和列表项添加了ID,以便jQuery可排序代码可以确定正在选择哪些项。
添加了options
属性,该属性将传递给基础jQuery Sortable插件。
为每个列表项添加了一个点击处理程序,供选择和多选。
<div class="list">
<h2>Stored procedures In DB 1</h2>
<ul class="list" id="sortableForDB_1" data-bind="sortable: {
data: storedProceduresInDB1,
beforeMove: checkAndCopy,
options: multiSortableOptions }">
<li class="item" data-bind="attr: { id: 'sp_'+Id }, text: Name,
click: $root.selectProcedure.bind($data, $parent.storedProceduresInDB1()),
css: { selected: Selected }">
</li>
</ul>
</div>
<div class="list">
<h2>Stored procedures In DB 2</h2>
<ul class="list" id="sortableForDB_2" data-bind="sortable: {
data: storedProceduresInDB2,
beforeMove: checkAndCopy,
options: multiSortableOptions }">
<li class="item" data-bind="attr: { id: 'sp_'+Id }, text: Name,
click: $root.selectProcedure.bind($data, $parent.storedProceduresInDB2()),
css: { selected: Selected }">
</li>
</ul>
</div>
<强>的JavaScript 强>
可排序选项。延迟150以允许点击处理程序用于选择。还原0因为动画看起来很奇怪我们如何搞乱列表和助手。
stop
函数会重置导致列表html刷新的observableArray
。
helper
函数会抓取所有选定的项目,并将它们添加到新的帮助程序标记中,以便直观地拖动多个项目。
var multiSortableOptions = {
delay: 150,
revert: 0,
stop: function(event, ui) {
// Force lists to refresh all items
var db1 = myViewModel.storedProceduresInDB1,
db2 = myViewModel.storedProceduresInDB2,
temp1 = db1(),
temp2 = db2();
ui.item.remove();
db1([]);
db1(temp1);
db2([]);
db2(temp2);
},
helper: function(event, $item) {
// probably a better way to pass these around than in id attributes, but it works
var dbId = $item.parent().attr('id').split('_')[1],
itemId = $item.attr('id').split('_')[1],
db = myViewModel['storedProceduresInDB'+dbId];
// If you grab an unhighlighted item to drag, then deselect (unhighlight) everything else
if(!$item.hasClass('selected')) {
ko.utils.arrayForEach(db(), function(item) {
if(item.Id == itemId) {
item.Selected(true);
} else {
item.Selected(false);
}
});
}
// Create a helper object with all currently selected items
var $selected = $item.parent().find('.selected');
var $helper = $('<li class="helper"/>');
$helper.append($selected.clone());
$selected.not($item).remove();
return $helper;
}
};
查看模型。为每个存储过程添加了Selected
可观察属性。添加了selectProcedure
方法,根据点击次数和ctrl +点击次数更新新的Selected
属性。
还对checkAndCopy
方法进行了大量修改。我认为内联评论可以解释它是如何运作的。
var ViewModel = function () {
var self = this;
self.storedProceduresInDB1 = ko.observableArray([
{ Name: 'SP1', Id: 1, Selected: ko.observable(false) },
{ Name: 'SP2', Id: 2, Selected: ko.observable(false) },
{ Name: 'SP3', Id: 3, Selected: ko.observable(false) }
]);
self.storedProceduresInDB2 = ko.observableArray([
{ Name: 'SP3', Id: 3, Selected: ko.observable(false) },
{ Name: 'SP4', Id: 4, Selected: ko.observable(false) },
{ Name: 'SP5', Id: 5, Selected: ko.observable(false) }
]);
self.checkAndCopy = function(event) {
var items;
if(event.targetParent !== event.sourceParent) {
// Get all items that don't yet exist in the target
items = ko.utils.arrayFilter(event.sourceParent(), function(item) {
return item.Selected() && !ko.utils.arrayFirst(event.targetParent(), function(targetItem) {
return targetItem.Id == item.Id;
});
});
// Clone the items (otherwise the Selected observable is shared by the item in both lists)
items = ko.utils.arrayMap(items, function(item) {
var clone = ko.toJS(item);
clone.Selected = ko.observable(true);
// While we're here, let's deselect the source items so it looks cleaner
item.Selected(false);
return clone;
});
// Deselect everything in the target list now so when we splice only the new items are selected
ko.utils.arrayForEach(event.targetParent(), function(item) {
item.Selected(false);
});
} else {
// Moving items within list, grab all selected items from list
items = event.sourceParent.remove(function(item) {
return item.Selected();
});
}
// splice items in at target index
items = items.reverse();
for(var i=0; i<items.length; i++) {
event.targetParent.splice(event.targetIndex, 0, items[i]);
}
// always cancel drop now, since we're manually rearranging everything
event.cancelDrop = true;
};
self.selectProcedure = function(array, $data, event) {
if(!event.ctrlKey && !event.metaKey) {
$data.Selected(true);
ko.utils.arrayForEach(array, function(item) {
if(item !== $data) {
item.Selected(false);
}
});
} else {
$data.Selected(!$data.Selected());
}
};
};
添加了对View Model的全局引用,以便jQuery代码可以与它进行交互。
myViewModel = new ViewModel();
ko.applyBindings(myViewModel);