温馨提示:本文翻译自stackoverflow.com,查看原文请点击:javascript - How do I toggle a knockout foreach div individually without adding more html?
arrays javascript knockout.js

javascript - 如何在不添加更多html的情况下单独切换淘汰的foreach div?

发布于 2020-04-25 23:31:48

我使用了foreach方法在可观察数组中创建标记foreach项目,以创建树视图。输出示例

类别名称1内容内容类别名称2内容内容

当我单击类别名称时,我只希望其内容显示/隐藏,当前,当我单击类别名称时,它显示并隐藏所有类别。

 var reportFilters = [
        { Text: "Campaign", Value: primaryCategories.Campaign },
        { Text: "Team", Value: primaryCategories.Team },
        { Text: "Agent", Value: primaryCategories.Agent },
        { Text: "List", Value: primaryCategories.List },
        { Text: "Inbound", Value: primaryCategories.Inbound },
        { Text: "Daily", Value: primaryCategories.Daily },
        { Text: "Services", Value: primaryCategories.Services },
        { Text: "Occupancy", Value: primaryCategories.Occupancy },
        { Text: "Data", Value: primaryCategories.Data }
    ];


  self.showCategory = ko.observable(false);      
    self.toggleVisibility = function (report) {
        var categoryName = report.PrimaryReportCategory;
        var categoryContent = report.ID;
        if (categoryName == categoryContent ) {
            self.showCategory(!self.showCategory());
        };
    }
  <div class="report-category-treeview"  data-bind="foreach: $root.categories, mCustomScrollBar:true">
            <ul class="column-list" >
                <li class="report-category-heading" data-bind="click: $root.toggleVisibility"><span class="margin-top10" ><i class="fas fa-chevron-down"></i> <span class="report-category-name" data-bind="text: categoryName"></span></span></li>
                <li id="panel" class="report-category-container" data-bind="foreach: reports, visible: $root.showCategory">
                    <div class="column-list-item" data-bind="click: $root.report_click, css: { 'selected': typeof $root.selectedReport() != 'undefined' && $data == $root.selectedReport() }">
                        <span class="column-list-text" data-bind="text: ReportName"></span>
                    </div>
                </li>
            </ul>
        </div>

查看更多

提问者
codeflower
被浏览
20
HeyJude 2020-02-10 06:50

当前,当我单击类别名称时,它将显示和隐藏所有类别。

这是因为showCategory您的单个可观察者负责显示\隐藏。您真正想要的是每个类别一个可隐藏的节目

我不确定整个数据模型的样子,但是由于您特别询问categories,因此您应该创建一个category视图模型,可能还需要创建一些容器视图模型,在这里我将其命名为master

var categoryVM = function (name) {
    var self = this;
    self.name = ko.observable(name);
    self.isVisible = ko.observable(false);
    self.toggleVisibility = function () {
        self.isVisible(!self.isVisible());
    }
    // ... add here your other observables ...
}

// name 'masterVM' whatever you like
var masterVM = function () {
    var self = this;
    self.categories = ko.observables([]);
    // ... probably add here other observables, e.g. 'reports' ...
    self.init = function (rawCategories) {
        rawCategories.forEach(function (item) {
            categories.push(new categoryVM(item.name)); // replace 'name' with your property
        }
    }
}

var master = new masterVM();
master.init(getCategories()); // pass in your categories from wherever they come from
ko.applyBindings(master);

然后,在您的html中,这将是您的外部foreach

<div class="report-category-treeview" data-bind="foreach: categories ... />

和您的lis(为简便起见,我在您的lis 之下省略了嵌套标签):

<li class="report-category-heading" 
    data-bind="click: toggleVisibility">
<li id="panel" class="report-category-container" 
    data-bind="foreach: $root.reports, visible: isVisible">