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问题:

My Android app uses a WebView to display a bunch of HTML code that I generate 'on the fly'. The HTML code is loaded using the following code:

    StringBuilder builder = new StringBuilder();

    // HTML
    builder.append("<html><head><link rel=\"stylesheet\" href=\"file:///android_asset/style.css\" type=\"text/css\">");
    builder.append("</link></head><body>");
    builder.append(getThreadBody());
    builder.append("</body></html>");

    webview.loadDataWithBaseURL("file:///android_asset/", builder.toString(), "text/html", "utf-8", null);

This all works really nice. Note that I'm not loading an actual HTML file, I'm merely creating a string that represents some (hopefully valid) HTML and load it in the WebView.

Anyway, the HTML I generate (the part in the 'getThreadBody' method) contains named anchors, for example like this;

<div>
    <a name="949823">Anchor 1</a>
    <div>All kinds of stuff</div>

    <a name="895984">Anchor 2</a>
    <div>...</div>
</div>

Now in some cases I want the WebView to navigate to one of those anchors as soon as I load the HTML. As far as I understand the WebView supports navigating (scrolling in this case) to named anchors, but the catch is that nobody is clicking any hyperlinks to those anchors, I want the WebView to scroll when it is loaded (it is no problem if there is a short delay between loading the HTML and scrolling, my point is that it should not require user interaction).

I believe the behavior can be achieved by using the WebView's loadUrl method and supplying a URL with the anchor in place, eg

webview.loadUrl("file:///android_asset/page.html#895984", ...)

However, since I am not saving the HTML to any file I cannot use this method... Of course saving the HTML to a temporary file may be a solution but I'd like to keep that as a last resort, there must be a simpler way?

How can I achieve this? Thanks!

Resolved Here's the code that works. I found a short delay was required to let the page load before executing the javascript otherwise it was kind of 50/50 whether it worked or not...

    StringBuilder builder = new StringBuilder();

    // HTML
    builder.append("<html><head><link rel=\"stylesheet\" href=\"file:///android_asset/style.css\" type=\"text/css\">");
    builder.append("</link>");
    builder.append("<script>");
    builder.append("function scrollAnchor(id) {");
    builder.append("window.location.hash = id;}");
    builder.append("</script>");
    builder.append("</head><body>");
    builder.append(getThreadBody());
    builder.append("</body></html>");

    webContents.loadDataWithBaseURL("file:///android_asset/", builder.toString(), "text/html", "utf-8", null);

    Timer timer = new Timer();
    timer.schedule(new TimerTask() {
        @Override
        public void run() {
            String id = "895884";
            webContents.loadUrl("javascript:scrollAnchor(" + id + ");");
        }
        }
    }, 250);

回答1:

How about control it by JavaScript? I didn't try it but maybe this is a clue.

builder.append(getThreadBody());
builder.append("<script>window.location.hash="949823";</script>");
builder.append("</body></html>");

Remember enable javascript for WebView.

----Additional Answer----

I saw that you use TimerTask to load the javascript, That works but I think there is another better way. WebView have a callback named onPageFinished and it will be trigger when WebView finish loading webpage. You could inject your JS there.

webContents.setWebViewClient(new WebViewClient(){

    @Override
    public void onPageFinished(WebView view, String url) {
          String id = "895884";
          webContents.loadUrl("javascript:scrollAnchor(" + id + ");");
    }

});

Hope this is useful!

回答2:

First of all, you don't need to use javascript. If you loaded content with

webContents.loadDataWithBaseURL("some://dummy/url",...);

you can simply scroll to anchor with

webContents.loadUrl("some://dummy/url#anchor");

Secondly, doing that on onPageFinished without additional control results in never ending loop! When loadUrl finishes onPageFinished get's called again and again.

回答3:

If you have external action (eg: onclick event), try this code

 public static void scrollToAnchor(String id) {
        sWebView.loadUrl("javascript:document.getElementById(\"" + id + "\").scrollIntoView()");
 }

回答4:

if you load the html from the assets:

 webView.loadUrl("file:///android_asset/htmls/mypage.html#anchor");

and you can move to the anchor inside a web page:

webView.loadUrl("http://www.stackoverflow.com/mypage.html#anchor");

WebView jump to anchor using loadDataWithBaseUrl

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WebView jump to anchor using loadDataWithBaseUrl

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