2-way-object-databinding

问题 Angular 2 supports unidirectional data flow, one way at a time. How does two way data binding [(ngModel)] works in Angular2 ? 回答1: Angular2 comprehends [(ngModel)] = myName as a property + event binding and as a collapsed version of, [ngModel] = 'myName' , and (ngModelChange) = 'updateMyNameValue(myName)' Their unidirectional data flow policy might as well as take the expanded version of it such as setting the scope variable explicitly by the inputs event when the value is changed and vice

问题 I want to two-way databind the field values of an iron-form to a Firebase node (representing user-defined settings , for example). settings.html <dom-module id="my-settings"> <template> <firebase-document location="[[firebaseUrl]]" data="{{form}}"> </firebase-document> <form is="iron-form" id="form"> <paper-checkbox id="history" name="history" on-change="_computeForm" >Save history </paper-checkbox> <!-- ... --> <!-- All types of form fields go here --> <!-- ... --> </form> </template>

问题 Relatively new to WFP and C# (longtime PHP programmer)... I successfully set up 2-WAY data binding between a TextBox and a Property of an Object. I was able to establish the binding in the Code-Behind, but not do it in the XAML instead. I would like to learn how to do the BINDING in the XAML instead. That is, in the example below, how to move the line myTestPanel.DataContext = CURRENT_NETWORK; from the Code-Behind to the XAML? I looked at tutorials, examples, etc., but none helped... They

问题 In Angular2 (Beta 6) I have a component for a main menu. <mainmenu></mainmenu> I want to bind a boolean for wide or narrow. So I made it into this: <mainmenu [(menuvisible)]="true"></mainmenu> But what I want (I think) is to bind to a javascript class property (as I may have other things to bind but want to be tidy by using a single class in the component). I get an error EXCEPTION: Template parse errors: Invalid property name 'menumodel.visible' (" ][(menumodel.visible)]="menumodel.visible">

问题 In Angular2 (Beta 6) I have a component for a main menu. <mainmenu></mainmenu> I want to bind a boolean for wide or narrow. So I made it into this: <mainmenu [(menuvisible)]="true"></mainmenu> But what I want (I think) is to bind to a javascript class property (as I may have other things to bind but want to be tidy by using a single class in the component). I get an error EXCEPTION: Template parse errors: Invalid property name 'menumodel.visible' (" ][(menumodel.visible)]="menumodel.visible">

问题 I have a view where I've got an object bound to a treeview. The object has a number of collections (of different types) so I'm using hiearchical templates with a CompositeCollection to display them in the treeview. I've then got a textbox that is bound to the treeview's selectedItem. Here I'm serialising the selectedItem to XML and displaying it in the textbox for editing. All good so far. However, the big problem I have is that I can't use 2-way databinding with the SelectedItem property of

问题 I've made a Blazor component this way: <input bind-value-oninput="Title" /> @functions { [Parameter] string Title { get; set; } [Parameter] EventCallback<string> TitleChanged { get; set; } } Parent: @page "/fetchdata" Parent:<input bind-value-oninput="Title" /> - Child:<Comp bind-Title="Title"></Comp> @functions { string Title; } as expected editing the parent input propagate it's value to the component but not viceversa, is that by design right? I achieved two-way behaviour with this edit:

问题 I'm trying to use native 2-way android data binding in my custom control so I have something like that in xml <layout> <data> <variable name="item" type="Boolean"/> </data> ... <my.control app:vm="@={item}"/> ... </layout> Please note, it's question about @={} - native 2 way binding. and something like that in code: class MyControl extends RelativeLayout{ ... @BindingAdapter("app:vm") public static void setVm(View v, VM vm){...} } My questions - how should I define getter for my viewModel? I

问题 I have a simple ng-repeat list, in which i am assigning current list item value to another property on the controller as follows: <li ng-repeat="num in list"> <input type="text" ng-init="value = num" ng-model="value" /> <button type="button" class="btn btn-primary" ng-click="save()">Save</button> </li> But when i click the Save button i get default value set for $scope.value. I expect the value for the particular input text to be displayed. Here is the controller: angular.module('myApp', [])

问题 Firstly, I should say that I have only attacked Angular.js for 2 days now so I may be approaching this whole thing wrong. My example "Person" object (or model if I understand) has two properties, Firstname and Title. I have two fields <select> for title and <input type="text" /> for name. The Firstname binding works fine and I am happy, but the title is confusing me. I am binding an object array with Code and Desc which populates fine. But when I want to get (on submit) or set (on load) it