Ember.js:具有动态绑定的 TextField [英] Ember.js: TextField with dynamic binding

问题描述

我想将 TextField 绑定到由字符串变量指定的属性(请参阅编辑以获得更好的解释)，如 这个问题.不幸的是，那里给出的答案不再有效.他们在那里使用以下视图:

I want to bind a TextField to a property which is specified by a string variable (see the edit for a better explanation), as in this question. Unfortunately the answer that was given there does not work anymore. They use the following view there:

App.AutoTextField = Ember.ContainerView.extend({
    type: null,
    name: null,

    init: function() {
        this._super();
        this.createChildView();
    },
    createChildView: function() {
         this.set('currentView', Ember.TextField.create({
                    valueBinding: 'controller.' + this.get('name'),
                    type: this.get('type')
                }));   
    }.observes('name', 'type')
});

到目前为止我能得到的最好的方法是用路径 _parentView.context. 替换 valueBinding.如果我这样做，文本字段将被呈现并且它们包含正确的值.如果我编辑它们，应用程序的其余部分不会得到更新.

The best I could get until now was replacing the valueBinding with the path _parentView.context.. If I do this the text fields get rendered and they contain the correct value. If I edit them the rest of the application doesn't get updated though.

您将如何在当前版本的 Ember 中解决此问题?

How would you solve this in the current version of Ember?

在链接的问题中给出了我想要做的更好的解释.我在当前上下文中有一个对象(比如 object)和一个字符串(key).我想要一个可以显示和呈现 object[key] 值的文本字段.

A better explanation of what I want to do is given in the linked question. I have an object (say object) and a string (key) in the current context. I want a text field that can show and render the value of object[key].

推荐答案

经过多次尝试失败后，我找到了一个非常简单的解决方案.

After many failed attempts I found a pretty simple solution.

添加助手

Ember.Handlebars.helper('dataTextField', function (data, key, options) {
    options.hash.valueBinding = 'data.' + key;

    return Ember.Handlebars.helpers.input.apply(this, [options]);
});

然后调用

{{dataTextField data key}}

这将呈现一个文本字段，显示和更改 data[key] 的值，它甚至支持普通 input 助手可以理解的所有可选参数.

This will render a text field that shows and changes the value of data[key] and it even supports all the optional arguments the normal input helper can understand.

这篇关于Ember.js:具有动态绑定的 TextField的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！