添加一个带有数据绑定的“dynamic”元素到我的polymer-element

Question

有几天我尝试用一​​些“动态”元素喂养聚合物:)不幸的是没有成功...... 我的目标是在运行时添加一个元素，并通过聚合物数据绑定填充内容（以“自然”聚合物方式填充。没有其他stackoverflow answer建议的解决方法。）

请查看此小提琴中的代码（https://jsfiddle.net/mkappeller/ken9Lzc7/）或此问题的底部。 我真的希望那里的任何人能够帮助我。 这也有助于了解将来某一天是否有办法做到这一点......？

window.addEventListener("WebComponentsReady", function() {
  var myAppModule = document.getElementById("my-app");
  var myApp = document.getElementsByTagName("my-app")[0];

  myApp.set("global", {
    text: "Init"
  });
});

<base href="https://polygit.org/components/">
<script src="webcomponentsjs/webcomponents-lite.min.js"></script>
<link href="polymer/polymer.html" rel="import">
<link rel="import" href="paper-button/paper-button.html">
<link rel="import" href="paper-input/paper-input.html">

<dom-module id="my-app">
  <template>
    <paper-input label="global.text" value="{{global.text}}"></paper-input>
    <paper-button raised id="addHeadline">Add Headline</paper-button>
    <paper-button raised id="changeText">Change Text</paper-button>
    <p>global.text: &lt;{{global.text}}&gt;</p>
  </template>
  <script>
    Polymer({
      is: "my-app",
      properties: {
        global: {}
      },
      ready: function() {
        this.count = 0;

        this.$.addHeadline.addEventListener("click", () => {

          var myApp = Polymer.dom(document.getElementById("my-app"));

          var t = myApp.node.childNodes[1];

          var heading = document.createElement("h1");
          heading.textContent = "{{global.text}}";

          // Append to my-app
          Polymer.dom(this.root).appendChild(heading);
        });
        this.$.changeText.addEventListener("click", () => {
          this.set("global.text", "count-" + this.count++);
        });
      }
    });
  </script>
</dom-module>
<my-app></my-app>

Answer 1

我几乎通过使用Polymer.Templatizer行为获得了它。不幸的是，似乎有一些错误或我的错误阻止了来自父级的更新被应用于动态创建的模板。我会在GitHub上提出一个问题。

<base href="https://polygit.org/components/">
<script src="webcomponentsjs/webcomponents-lite.min.js"></script>
<link href="polymer/polymer.html" rel="import">
<link rel="import" href="paper-button/paper-button.html">
<link rel="import" href="paper-input/paper-input.html">

<dom-module id="my-app">
  <template>
	<paper-input label="global.text" value="{{global.text}}"></paper-input>
	<paper-button raised id="addHeadline" on-tap="addHeadline">Add Headline</paper-button>
	<paper-button raised id="changeText" on-tap="click">Change Text</paper-button>
	<p>global.text: &lt;{{global.text}}&gt;</p>
	
	<template if="true" is="dom-if">
	  <div>      
		dom-if: <input type="text" value="{{global.text::input}}" />
	  </div>
	</template>
  </template>
  <script>
	Polymer({
	  is: "my-app",
	  behaviors: [ Polymer.Templatizer ],
	  properties: {
		global: {
		  value: { text:'i' },
		  notify: true
		}
	  },
	  ready: function() {
		this.count = 0;
		
        // this ensures that global.text is updated when text changes
		this._instanceProps = {
			text: true
		};
	  },
	  addHeadline: function() {
		
		this.template = document.createElement("template");
		var templateRoot = document.createElement('div');
		templateRoot.innerHTML = `<h1>{{text.text}}</h1><input type="text" value="{{text.text::input}}" />`;
        // you cannot just set innerHTML in <template>
		this.template.content.appendChild(templateRoot);
		
		this.templatize(this.template);
		var clone = this.stamp({
		  text: this.global
		});

		// Append to my-app
		Polymer.dom(this.root).appendChild(clone.root);
	  },
	  click: function() {
		this.set("global.text", "count-" + this.count++);
	  },
	  _forwardInstanceProp: function(inst, p, val) {
		debugger;
	  },
	  _forwardInstancePath: function(inst, p, val) {
        // notify parent's correct path when text.text changes
		this.set(p.replace(/^text/, 'global'), val);
	  },
	  _forwardParentProp: function(prop, value) {
		debugger;
	  },
	  _forwardParentPath: function(prop, value) {
		debugger;
	  }
	});

  </script>
</dom-module>
<my-app></my-app>