将小部件添加到不属于DOM结构的纯html中

Question

好吧,这真的很烦人,因为我确信GWT应该支持我想做的事情.我已经问了两次我在网上搜索但我找不到解决问题的办法.

我想要做的是从服务器加载一个文本文件,如下所示:

<!-- linear_regression.txt -->
<h1>Linear Regression</h1>
Welcome to this chapter. Here, have a graph:
<div id="whatever"></div>
Alright, now have some math stuff:

并将Widget- 在我的情况下一个折线图 - 放入div <div id="whatever">.我试过几件事......

---

在onSuccess()RPC 的方法中我想做类似的事情:

public void onSuccess(String result) {

    HTMLPanel tmp = new HTMLPanel(result);
    Element el = tmp.getElementById("whatever");

    el.appendChild(new LineChart().asWidget().getElement());

    contentRoot.add(tmp);
}

如果我这样做,我的结果如下:

<div id="whatever">
    <!-- Here I want the chart to be placed but all I get is this: -->
    <div></div> 
</div>

---

另一种方法如下:

    HTMLPanel tmp = new HTMLPanel(result);
    contentHome.add(tmp);

    Element el = RootPanel.get("whatever").getElement();
    el.appendChild(new LineChart().asWidget().getElement());

但在这里我得到了一个未被捕获的例外:

java.lang.AssertionError: A widget that has an existing parent widget 
may not be added to the detach list
    at com.google.gwt.user.client.ui.RootPanel.detachOnWindowClose(RootPanel.java:136)
    at com.google.gwt.user.client.ui.RootPanel.get(RootPanel.java:211)
    at ew.client.layout.MainLayout$1.onSuccess(MainLayout.java:95)
    at ew.client.layout.MainLayout$1.onSuccess(MainLayout.java:1)
    ...

---

我真的厌倦了这个问题.有谁知道我怎么能解决这个问题？

Answer 1

包裹div在里面HTLMPanel

LineChart lineChart = new LineChart();
HTMLPanel panel = new HTMLPanel(result);
panel.add(lineChart, "whatever");