javascript - 将具有数据绑定(bind)的 "dynamic"元素添加到我的 polymer 元素

Question

连续几天我尝试向 Polymer 提供一些“动态”元素:)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 polymer 数据绑定(bind)(以“自然” polymer 方式)用内容填充它。没有另一个 stackoverflow answer 中建议的解决方法。)

请看一下这个 fiddle ( https://jsfiddle.net/mkappeller/ken9Lzc7/ )或这个问题底部的代码。 我真的希望任何人都能够帮助我。 了解将来是否有办法做到这一点也会有所帮助......？

<小时/>

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行为得到了它。不幸的是，似乎存在一些错误或我的错误，导致父级的更新无法应用于动态创建的模板。我将在 GitHub 上提出问题。

<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>