更新模型内的数据时,是否可以保留排序顺序(最后是 jsfiddle)?我有以下标记:
<table>
<thead>
<tr>
<th data-bind="sort: { arr: Records, prop: 'Name' }">Name</th>
<th data-bind="sort: { arr: Records, prop: 'Number' }">Number</th>
<th data-bind="sort: { arr: Records, prop: 'Desc' }">Description</th>
</tr>
</thead>
<tbody data-bind="foreach: Records">
<tr>
<td data-bind="text: Name"></td>
<td data-bind="text: Number"></td>
<td data-bind="text: Desc"></td>
</tr>
</tbody>
</table>
<button data-bind="click: changeMe">Remove</button>
<button data-bind="click: resetMe">Reset</button>
现在,排序本身是使用bindingHandlers
这个原始帖子实现的:
var recs = [];
ko.bindingHandlers.sort = {
init: function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
var asc = false;
element.style.cursor = 'pointer';
element.onclick = function(){
var value = valueAccessor();
var prop = value.prop;
var data = value.arr;
asc = !asc;
if(asc){
data.sort(function(left, right){
return left[prop] == right[prop] ? 0 : left[prop] < right[prop] ? -1 : 1;
});
} else {
data.sort(function(left, right){
return left[prop] == right[prop] ? 0 : left[prop] > right[prop] ? -1 : 1;
});
}
}
}
};
function ViewModel(){
var self = this;
self.Records = ko.observableArray();
self.changeMe = function() {
self.Records.pop()
}
self.resetMe = function() {
var recs = []
recs.push({Name: 'Bob', Number: 1, Desc: 'I am awesome'});
recs.push({Name: 'Joe', Number: 2, Desc: 'Another description'});
recs.push({Name: 'Mitch', Number: 3, Desc: 'Something'});
recs.push({Name: 'Steven', Number: 4, Desc: 'Yo'});
self.Records(recs);
}
}
var viewModel = new ViewModel();
recs.push({Name: 'Bob', Number: 1, Desc: 'I am awesome'});
recs.push({Name: 'Joe', Number: 2, Desc: 'Another description'});
recs.push({Name: 'Mitch', Number: 3, Desc: 'Something'});
recs.push({Name: 'Steven', Number: 4, Desc: 'Yo'});
recs.push({Name: 'Robin', Number: 6, Desc: 'Hello'});
recs.push({Name: 'Batman', Number: 7, Desc: 'Description'});
recs.push({Name: 'John', Number: 5, Desc: 'Ok'});
viewModel.Records(recs);
ko.applyBindings(viewModel);
例如,考虑这个JSFiddle和以下一系列交互:
- 单击一列,以便按该列对行进行排序。单击“数字”两次,使其按降序排序。
- 现在,点击“重置”来模拟一个 ajax 调用(即,假设我正在更新模型)。现在,排序顺序恢复到原来的状态。
我怎样才能保留排序顺序,即,记住它应该按“数字”按降序排序的事实?而且,当然,在列旁边以某种方式显示它?类似于数据表的操作方式(注意每个列名称旁边的向上和向下箭头)。
有什么建议么?