Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
658 views
in Technique[技术] by (71.8m points)

webview - Uncaught ReferenceError while loading asset file on android 4.4

I am using following MathJax app code. http://cs.jsu.edu/wordpress/?p=498#comment-217

In following function i am trying to load file from asset directory.

public static boolean makeMathView_new(WebView webview) {
            webview.getSettings().setRenderPriority(RenderPriority.HIGH);
            webview.getSettings().setJavaScriptEnabled(true);
            webview.loadDataWithBaseURL("http://bar", "<script type='text/x-mathjax-config'>"
                    +"MathJax.Hub.Config({ messageStyle: 'none', showMathMenu: false, jax: ['input/TeX','output/HTML-CSS'], "
                    +"extensions: ['tex2jax.js'],"         
                + "'HTML-CSS': { scale: 100 },"              
                    +"TeX: { extensions: ['AMSmath.js','AMSsymbols.js','noErrors.js','noUndefined.js'] } });</script>"
                +"<script type='text/javascript' src='file:///android_asset/MathJax/MathJax.js'></script>" 
                + "<span id='math'></span>","text/html","utf-8", "");


        return true;
    }

When running on android 4.4 emulator, I am getting following errors.

V/WebViewChromium(1342): Binding Chromium to the background looper Looper{b1da1340}
 I/chromium(1342): [INFO:library_loader_hooks.cc(112)] Chromium logging enabled: level = 0, default verbosity = 0
 I/BrowserProcessMain(1342): Initializing chromium process, renderers=0
 W/chromium(1342): [WARNING:proxy_service.cc(888)] PAC support disabled because there is no system implementation
 E/chromium(1342): [ERROR:gl_surface_egl.cc(153)] No suitable EGL configs found.
 E/chromium(1342): [ERROR:gl_surface_egl.cc(620)] GLSurfaceEGL::InitializeOneOff failed.
 E/chromium(1342): [ERROR:gl_surface_egl.cc(153)] No suitable EGL configs found.
 E/chromium(1342): [ERROR:gl_surface_egl.cc(620)] GLSurfaceEGL::InitializeOneOff failed.
 E/chromium(1342): [ERROR:gpu_info_collector.cc(86)] gfx::GLSurface::InitializeOneOff() failed

I/chromium(1101): [INFO:CONSOLE(1)] "Uncaught ReferenceError: MathJax is not defined", source: http://bar/ (1)

Update: After incorporating ksasq's suggestion , Here is my new code but it is still not working.

webview.loadDataWithBaseURL("http://bar", "<script type='text/x-mathjax-config'>"
      + "function setupMathJax() {"
                + "MathJax.Hub.Config({ messageStyle: 'none', showMathMenu: false, jax: ['input/TeX','output/HTML-CSS'], "
                    +"extensions: ['tex2jax.js'],'HTML-CSS': { scale: 100 },"            
                    +"TeX: { extensions: ['AMSmath.js','AMSsymbols.js','noErrors.js','noUndefined.js'] } });" 
     + "}"
                + "</script>"
                + "<script type='text/javascript' src='file:///android_asset/MathJax/MathJax.js'></script>" 
     + "<body onload='setupMathJax()'>"
                + "<span id='math'></span>" 
     + "</body>"
                ,"text/html","utf-8", "");
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

You have to replace all the lines loadUrl(...) with evaluateJavascript(...). But this is only for KitKat (API 19 or above), so you need to do an SDK version check first:

if (android.os.Build.VERSION.SDK_INT < 19) {
    mWebView.loadUrl("javascript:MathJax.Hub.Queue(['Typeset',MathJax.Hub]);");
} else {
    mWebView.evaluateJavascript("javascript:MathJax.Hub.Queue(['Typeset',MathJax.Hub]);",null);
}

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

1.4m articles

1.4m replys

5 comments

57.0k users

...