如何在淘汰赛 js 中将值从一个视图模型传递到另一个视图模型? [英] How to pass value from one view model to another viewmodel in knockout js?
问题描述
我有两个视图模型,我想将值从一个视图模型传递到另一个视图模型.我有两个视图模型和两个 div,我想在单击 div 1 中的按钮时显示另一个 div.
这里是html代码
<ul ><li >Container1 item</li><!-- ko foreach: myItems --><li>Item <span data-bind="text: $data"></span></li><!--/ko --><button data-bind="click:showDiv">显示另一个div</button><div id="container2" data-bind="visible:show"><ul><li >Container2 item</li><!-- ko foreach: myItems --><li>Item <span data-bind="text: $data"></span></li><!--/ko -->
这里是脚本
function Container1ViewModel(){var self = this;self.myItems = ko.observableArray();self.myItems.push("ABC");self.myItems.push("CDE");}函数 Container2ViewModel() {var self = this;self.myItems = ko.observableArray();self.myItems.push("XYZ");self.myItems.push("PQR");}var container1VM;var container2VM;$(document).ready(function() {如果 ($.isEmptyObject(container1VM)) {container1VM = new Container1ViewModel();ko.applyBindings(container1VM, document.getElementById("container1"));}如果 ($.isEmptyObject(container2VM)) {container2VM = 新的 Container2ViewModel();ko.applyBindings(container2VM, document.getElementById("container2"));}});
我该怎么做?
您可以使用@RyanNiemeyer 的 KO.postbox
我在两个视图模型中都引入了一个变量
在视图模型 1 中,它将发布(喊出)所做的更改:
self.isVisible = ko.observable(false).publishOn("showDiv");
在视图模型 2 中,它将列出视图模型 1 的更改
self.isVisible = ko.observable(false).subscribeTo("showDiv");
然后我在第一个 viewModel 中创建了一个单击方法来切换 Show Div 动作(可见:真/假)
self.showDiv = function(){如果(self.isVisible())self.isVisible(false);别的self.isVisible(true);}
将可见绑定从现有标记更改为:
它现在将在第一个视图模型中所做的更改发布到第二个视图模型.这称为发布-订阅机制.阅读更多:https://github.com/rniemeyer/knockout-postbox
在这里小提琴:http://jsfiddle.net/rahulrulez/0454h205/1/
i have two view models and i want to pass value from one view model to another viewmodel. i have two viewmodels and two div i want to display another div on click of button which is present in div 1.
here is html code
<div id="container1">
<ul >
<li >Container1 item</li>
<!-- ko foreach: myItems -->
<li>Item <span data-bind="text: $data"></span></li>
<!-- /ko -->
</ul>
<button data-bind="click:showDiv">show another div</button>
</div>
<div id="container2" data-bind="visible:show">
<ul>
<li >Container2 item</li>
<!-- ko foreach: myItems -->
<li>Item <span data-bind="text: $data"></span></li>
<!-- /ko -->
</ul>
</div>
and here is script
function Container1ViewModel()
{
var self = this;
self.myItems = ko.observableArray();
self.myItems.push("ABC");
self.myItems.push("CDE");
}
function Container2ViewModel() {
var self = this;
self.myItems = ko.observableArray();
self.myItems.push("XYZ");
self.myItems.push("PQR");
}
var container1VM;
var container2VM;
$(document).ready(function() {
if ($.isEmptyObject(container1VM)) {
container1VM = new Container1ViewModel();
ko.applyBindings(container1VM, document.getElementById("container1"));
}
if ($.isEmptyObject(container2VM)) {
container2VM = new Container2ViewModel();
ko.applyBindings(container2VM, document.getElementById("container2"));
}
});
how can i do it ?
解决方案 You can make use of KO.postbox by the great @RyanNiemeyer
I introduced one variable in both the viewmodels each
In viewmodel 1 which will publish (shout) the changes once made :
self.isVisible = ko.observable(false).publishOn("showDiv");
in viewmodel 2 which will be listning to changes from viewmodel 1
self.isVisible = ko.observable(false).subscribeTo("showDiv");
Then I created one click method in first viewModel to toggle Show Div action (visible : true / false)
self.showDiv = function(){
if(self.isVisible())
self.isVisible(false);
else
self.isVisible(true);
}
Changed visible binding from your existing markup to this :
<div id="container2" data-bind="visible:isVisible">
It now publish changes made in first viewmodel to second viewmodel. This is called pub-sub mechanism. Read more on : https://github.com/rniemeyer/knockout-postbox
Fiddle here : http://jsfiddle.net/rahulrulez/0454h205/1/
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