我在处理 Knockout JS 中的复选框时遇到问题。
jsfiddle 链接:http: //jsfiddle.net/wenbert/Xyuhk/72/
请注意,我为每个父母(英雄)提供了 2 个选择框。每个人都使用不同的方式,但都或多或少地“观察”同一个对象。
工作流程
- 单击一个灰色框
- 应该会出现一个带有蓝色虚线的框,其中包含选择框的项目。
- 从这里,您可以编辑选择框的项目。
- 在这里小提琴:http: //jsfiddle.net/wenbert/Xyuhk/72/
问题
- 当我删除一个项目时,我无法将它从“选择”框中删除。请注意,我不想将其从对象中完全删除。我只想将当前项目标记为“isDeleted”。
- 选择 A - 隐藏项目,但在选择框中留下一个空选项。
- 选择 B - “ifnot: isDeleted”对选项没有任何影响。
问题
如何处理选择框?我以 2 种不同的方式渲染了 2 个选择框以尝试使其ifnot: isDeleted
生效,但它们都不起作用。
更新:有了这个设置,我如何做选择框的“选定”值?
HTML
<button data-bind="click: addHero">Add Hero</button>
<ul data-bind="foreach: heroes">
<li class="parent" data-bind="ifnot: isDeleted, click: $parent.selectHero">
<input class="big-box" type="text" data-bind="value: name" />
<button class="btn-small" data-bind="click: $parent.removeHero">Remove Hero</button>
<br/>
SKILLS:
Select A) <select data-bind="foreach: skills">
<option data-bind="value: name, text: name, ifnot: isDeleted"></option>
</select>
Select B) <select data-bind="options: skills, optionsText: 'name', value: selected_skill.name, ifnot: isDeleted">
</select>
<br/>
<span class="instructions">(Step 1: Click somewhere here)</span>
</li>
</ul>
<div class="edit-panel" data-bind="if: selectedHero">
Edit Skill:<br/>
<div data-bind="with: selectedHero">
<button class="btn-small" data-bind="click: addSkill">Add Skill</button>
<ul data-bind="foreach: skills">
<li data-bind="ifnot: isDeleted">
<button class="btn-small" data-bind="click: $parent.setAsDefaultSkill">Set as default</button>
<input data-bind="value: name" />
<button class="btn-small" data-bind="click: $parent.removeSkill">Remove Skill</button>
</li>
</ul>
<span class="instructions">(Step 2: Remove a Skill, then have a look at the Select Box above.)</span>
</div>
</div>
<pre data-bind="text: ko.toJSON($data, null, 2)"></pre>
Javascript
var initialData = [
{
id: '1',
name: "Batman",
isDelete: false,
selected_skill: {name: "Boxing", isDeleted: false},
skills: [
{ id: '1', name: "Karate", isDeleted: false },
{ id: '2', name: "Boxing", isDeleted: false},
{ id: '6', name: "Sonar", isDeleted: false}
]
},
{
id: '2',
name: "Hulk",
isDelete: false,
skills: [
{ id: '3', name: "MMA", isDeleted: false },
{ id: '4', name: "Rage", isDeleted: false},
{ id: '5', name: "Extra Strength", isDeleted: false}
]
},
];
function Hero(data) {
var self = this;
self.name = ko.observable(data.name);
self.selected_skill= ko.observable(data.selected_skill);
self.skills = ko.observableArray(ko.utils.arrayMap(data.skills, function(i) {
return new Skills(i);
}));
self.addSkill = function() {
self.skills.push(new Skills({name: '---', isDeleted: false}));
}
self.setAsDefaultSkill = function(item) {
self.selected_skill(item);
}
self.isDeleted = ko.observable(data.isDeleted);
self.removeSkill = function(item) {
item.isDeleted(true);
}
}
function Skills(data) {
var self = this;
self.name = ko.observable(data.name);
self.isDeleted = ko.observable(data.isDeleted);
}
function SuperheroViewModel(data) {
var self = this;
self.heroes = ko.observableArray(ko.utils.arrayMap(data, function(i){
return new Hero(i);
}));
self.selectedHero = ko.observable();
self.selectedHero.skills = ko.observableArray();
self.addHero = function() {
self.heroes.push(
new Hero({
name: 'Wolverine',
isDelete: false,
skills: [{name: 'Breathing', isDeleted: false}],
})
);
}
self.selectHero = function(item) {
self.selectedHero(item);
}
self.removeHero= function(item) {
item.isDeleted(true);
}
}
ko.applyBindings(new SuperheroViewModel(initialData ));
我希望一切都清楚。
任何答复将不胜感激。
谢谢!