用淘汰赛映射插件递归模板
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13-10-2019 - |
题
我正在尝试使用 KO.映射插件, ,但是除非我定义 分离 每个级别的模板。
在以下情况下,我想重复使用 mvvmtreeviewgrouptemplate 为了 mvvmtreeviewsubgroups 同样,但这并没有渲染,这是一个错误还是未实现的功能?
<div id="treeViewArea">
<ul data-bind='template: {
name: "mvvmTreeViewGroupTemplate",
foreach: MvvmTreeItemGroups,
beforeRemove: function(elem) { $(elem).slideUp() },
afterAdd: function(elem) { $(elem).hide().slideDown() }
}'>
</ul>
</div>
<script type="text/x-jquery-tmpl" id="mvvmTreeViewGroupTemplate"> <li>
<span data-bind="text: Title" class="mvvmTreeItemStyle"/></br/> <ul data-bind='template: {
name: "mvvmTreeViewItemTemplate",
foreach: MvvmTreeItems,
beforeRemove: function(elem) { $ (elem).slideUp() },
afterAdd: function(elem) { $ (elem).hide().slideDown() }
}'>
<ul data-bind='template: {
name: "mvvmTreeViewSubGroupTemplate",
foreach: this.MvvmTreeItemSubGroups,
beforeRemove: function(elem) { $ (elem).slideUp() },
afterAdd: function(elem) { $ (elem).hide().slideDown() }
}'>
</ul>
</ul>
</li>
</script>
<script type="text/x-jquery-tmpl" id="mvvmTreeViewSubGroupTemplate"> <li>
<span data-bind="text: Title" class="mvvmTreeItemStyle"/></br/>
<ul data-bind='template: {
name: "mvvmTreeViewItemTemplate",
foreach: MvvmTreeItems,
beforeRemove: function(elem) { $ (elem).slideUp() },
afterAdd: function(elem) { $ (elem).hide().slideDown() }
}'>
</ul>
</li>
</script>
JSON和脚本看起来像这样,
var data = {
MvvmTreeItemGroups: [
{
Id: 1, Title: 'Group 1',
MvvmTreeItemSubGroups: [{
Id: 1, Title: 'Group 11',
MvvmTreeItems: [{ Id: 'i111', Title: 'Item 111' },
{ Id: 'i112', Title: 'Item 112'}]
},
{
Id: 1, Title: 'Group 121',
MvvmTreeItems: [{ Id: 'i121', Title: 'Item
121' }, { Id: 'i122', Title: 'Item 122'}]
}],
MvvmTreeItems: [{ Id: 'i11', Title: 'Item 11' }, { Id:
'i12', Title: 'Item 12'}]
},
{
Id: 2, Title: 'Group 2',
MvvmTreeItemSubGroups: [{
Id: 1, Title: 'Group 211',
MvvmTreeItems: [{ Id: 'i211', Title: 'Item
211' }, { Id: 'i212', Title: 'Item 212'}]
},
{
Id: 1, Title: 'Group 121',
MvvmTreeItems: [{ Id: 'i121', Title: 'Item
121' }, { Id: 'i122', Title: 'Item 122'}]
}],
MvvmTreeItems: [{ Id: 'i21', Title: 'Item 21' },
{ Id: 'i22', Title: 'Item 22'}]
}]
};
var viewModel = ko.mapping.fromJS(data);
console.log(viewModel);
ko.applyBindings(viewModel, treeViewArea);
解决方案
我回答了我的问题 这个Google线程. 。这并不是一个“递归模板”问题,而是因为模板不知道该名称没有数组,该模板不知道如何渲染。
有两种解决问题的方法:
在像这样呈现模板之前,检查MVVMtreeItemGroups数组是否真的存在
{{if $data.MvvmTreeItemGroups }} <ul data-bind='template: { name: "mvvmTreeViewGroupTemplate", foreach: MvvmTreeItemGroups }'> </ul> {{/if}}
使用关键字检查mvvmtreeitemgroups真正存在
{if 'MvvmTreeItemGroups' in $data}} <ul data-bind='template: { name: "mvvmTreeViewGroupTemplate", foreach: MvvmTreeItemGroups }'> </ul> {{/if}}
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