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POAndroid WebView - Setting HTML Field focus using Javascript
 

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  1. POAndroid WebView - Setting HTML Field focus using Javascript
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    <p>I have an application with just a visible <code>WebView</code> component to it which is used to display some dynamically generated HTML (can run Javascript too). It's enabled for the <code>WebView</code>.</p> <p>For a few pages I am trying to set the focus of one of the input text boxes after the page load has finished - <strong>not through</strong> Body <code>onLoad()</code>, but instead by a JS call after the page has finished loading i.e. in <code>onPageFinished()</code>. Most of the javascript executes fine </p> <pre><code> webview.loadURL("javascript:JSMethod();"); </code></pre> <p>But when I use the same call to do a <code>document.getElementById('text1').focus()</code> - the cursor does reach the element but the <code>Soft Keyboard</code> won't pop out. The same javascript code when executed from a button on the page does have the desired effect. </p> <p>I am attaching the source code which has <strong>3 buttons</strong></p> <ol> <li><code>Focus Text1</code> - Put the cursor on the text1 and pops up the Softkeyboard.</li> <li><code>Java Focus Text1</code> - Calls Java to execute the same JS. Only shows the cursor there and doesn't pop out the keyboard</li> <li><code>Java Focus Text1 And Keyboard Open</code> - Calls JS from Java and Forces Keyboard open.</li> </ol> <p>My understanding is that the JS execution should work the same whether executed from the browser using a button/event or as sent from Java through <code>WebView.loadURL()</code>. </p> <p>Here's my <strong>Queries</strong></p> <ol> <li>Am I missing something when using <code>Button#2</code>? That's how my current code is and I only see the cursor is set but the SoftKeyboard won't open.</li> <li>When I use logic as written in <code>Button#3</code>, I some times don't see the cursor on the field but gives me the desired effect and the cursor becomes visible when I type something in the popped up keyboard.</li> <li>Could the behavior I see in <code>Button#2</code> be a bug in Android JS execution? Or could it be that the <code>WebView</code> doesn't have focus that's why only the cursor is displayed? I also tried <code>webview.requestFocus()</code> - I can't write <code>requestFocusOnTouch()</code> as it's the only View I have and am expecting it's focused automatically.</li> </ol> <p>The Java code which demos the behavior is </p> <pre><code> import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.util.Log; import android.view.inputmethod.InputMethodManager; import android.webkit.JsResult; import android.webkit.WebChromeClient; import android.webkit.WebView; import android.webkit.WebViewClient; public class WebViewProjectTestJSHTMLFocusActivity extends Activity { Activity _current = null; WebView wv = null; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); _current = this; //setContentView(R.layout.main); String data = "&lt;html&gt;&lt;body&gt;" + "&lt;script&gt;function focusser() { document.getElementById(\"text1\").focus(); } &lt;/script&gt;" + "&lt;script&gt;function javaFocusser() { javautil.javaFocus(false); } &lt;/script&gt;" + "&lt;script&gt;function javaFocusserKeyboard() { javautil.javaFocus(true); } &lt;/script&gt;" + "Text 1&lt;input type='text' id='text1'/&gt;&lt;br/&gt;" + "Text 2&lt;input type='text' id='text2'/&gt;&lt;br/&gt;" + "&lt;input type='button' value='Focus Text1' onClick='focusser()'/&gt;" + "&lt;input type='button' value='Java Focus Text1' onClick='javaFocusser()'/&gt;" + "&lt;input type='button' value='Java Focus Text1 And Keyboard Open' onClick='javaFocusserKeyboard()'/&gt;" + "&lt;/body&gt;&lt;/html&gt;"; wv = new WebView(this); wv.getSettings().setJavaScriptEnabled(true); // Set some HTML wv.loadDataWithBaseURL("file:///android_asset/", data, "text/html", "UTF-8", null); // Call back required after page load finished wv.setWebViewClient(new CustomWebViewClient()); // Enable Alert calls wv.setWebChromeClient(new CustomWebChromeClient()); // For JS-&gt;Java calls wv.addJavascriptInterface(this, "javautil"); setContentView(wv); } /** * Calls the same javascript and forces the keyboard to open */ public void javaFocus(final boolean shouldForceOpenKeyboard) { Thread t = new Thread("Java focusser thread") { public void run() { wv.loadUrl("javascript:focusser();"); if(shouldForceOpenKeyboard) { InputMethodManager mgr = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); mgr.showSoftInput(wv, InputMethodManager.SHOW_IMPLICIT); } } }; // Run on the View Thread. _current.runOnUiThread(t); } /** * Calls focus method after the page load is complete. */ final class CustomWebViewClient extends WebViewClient { @Override public void onPageFinished(WebView view, String url) { // javaFocus(true); Log.d("TestExamples", "focusser call complete"); } } final class CustomWebChromeClient extends WebChromeClient { @Override public boolean onJsAlert(WebView view, String url, String message, JsResult result) { Log.d("TestExamples", "JS Alert :: " + message); return false; } } } </code></pre> <p><strong>Solution Update 24-06-2011</strong> To make this work, you need to use <code>wv.requestFocus(View.FOCUS_DOWN)</code> just before the actual JS focus call. I modified the <code>javaFocus()</code> method above to the correct version below. Earlier when I mentioned that I was using requestFocus(), I was using that when the <code>WebView</code> was initialized in the method <code>onCreate()</code>. The primary difference is now we're forcing the <code>WebView</code> to get focus each time just before the Javascript <code>document.getElementById("text1").focus();</code> is executed. </p> <pre><code>public void javaFocus(final boolean shouldForceOpenKeyboard) { Thread t = new Thread("Java focusser thread") { public void run() { wv.requestFocus(View.FOCUS_DOWN); wv.loadUrl("javascript:focusser();"); if(shouldForceOpenKeyboard) { InputMethodManager mgr = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); mgr.showSoftInput(wv, InputMethodManager.SHOW_IMPLICIT); } } }; // Run on the View Thread. _current.runOnUiThread(t); } </code></pre> <p>Also to ensure that this issue wasn't fixed because of focus triggered through touch etc, I am using a background thread to initiate the javaFocus() after 5 seconds of WebView Displayed. The modified <code>onCreate()</code> is below. </p> <pre><code>..... More onCreate code before.... // Enable Alert calls wv.setWebChromeClient(new CustomWebChromeClient()); // For JS-&gt;Java calls wv.addJavascriptInterface(this, "javautil"); setContentView(wv); new Thread("After sometime Focus") { public void run() { try { Thread.sleep(5000); } catch (InterruptedException e) { e.printStackTrace(); } javaFocus(true); } }.start(); .... onCreate() ends after this.... </code></pre>
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    1. COThanks for the thorough explanation. I had the same problem but this solution did not work for me on Android 3.2. In the end I had to write a function that simulated an actual tap on the field. I don't know why your solution didn't work. The WebView is just chock full of quirks.
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    2. COI didn't test this code in Android 3.x/4.x. But did you try to run this sample program in either of them?
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    3. COI'd love to know if you can use this approach to make sure that a type=number input actually gets a numeric keyboard. As far as I am getting, InputMethodManager can only open the standard keyboard layout (Qwerty) since it doesn't know which HTML element currently has focus. Using wv.requestFocus didn't help.
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