具有dom-repeat的Polymer 1.0动态模板 [英] Polymer 1.0 dynamic template with dom-repeat

问题描述

我有一个场景，我想创建动态的template元素，这些元素将与Polymer的dom-repeat一起使用.

I have a scenario where I would like to create dynamic template elements that will be used with Polymer's dom-repeat.

我当前的原型如下( JSbin演示):

My current prototype is the following (JSbin demo):

var domRepeat = document.createElement('template', 'dom-repeat');
domRepeat.items = ['a', 'b', 'c'];
var div = domRepeat.content.ownerDocument.createElement('div');
div.innerHTML = '[[item]]';
domRepeat.content.appendChild(div);
document.body.appendChild(domRepeat);
Polymer.dom.flush();

但是，此功能无法正常工作.输出为:

However, this does not work as intended. The output is:

[[item]]
[[item]]
[[item]]

而不是:

a
b
c

由于[[item]]被打印了3次，所以我猜dom-repeat本身可以工作，但是数据绑定无效.

Since the [[item]] is printed out 3 times, I guess the dom-repeat itself works, but the data binding does not.

绘制扭曲:但是，如果我将示例从dom-repeat更改为dom-bind，则数据绑定确实有效.更改示例，受此答案(

Plot twist: but if I change the example from dom-repeat to dom-bind, then the data binding does work. Changed example, inspired by this answer (JSBin demo):

var domBind = document.createElement('template', 'dom-bind');
domBind.item = 'Hello World!';
var div = domBind.content.ownerDocument.createElement('div');
div.innerHTML = '[[item]]';
domBind.content.appendChild(div);
document.body.appendChild(domBind);
Polymer.dom.flush();

按预期，输出为Hello World!.

关于如何使第一个示例生效的任何想法?

Any ideas on how to get the first example to work?

推荐答案

在动态创建的HTML中绑定当前并不那么容易.我认为最终有计划会对此提供更好的支持.

Binding in dynamically created HTML isn't that easy currently. I think there are plans to support this better eventually.

同时，模板程序应允许实现这种情况. 我自己没有使用过它，也没有找到代码示例. 铁清单和dom-if，dom-bind，dom-repeat似乎都在使用它，这可能用作自定义实现的模板.

In the meantime Templatizer should allow to implement such a scenario. I haven't used it myself and haven't found code examples. iron-list and dom-if, dom-bind, dom-repeat seem to make use of it which might work as template for custom implementations.

https://github.com/Polymer/聚合物/blob/master/src/lib/template/templatizer.html

这可能会帮助 http://t-code.pl/blog/2015/08/polymer-templatizer/

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