Uncaught ReferenceError while loading asset file on android 4.4

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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.

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4条回答

醉梦人生

2020-12-18 11:49
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);
}
```
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温柔的废话

2020-12-18 12:00

if (android.os.Build.VERSION.SDK_INT < 19) {
                    v.loadUrl(url);
                } else {
                    v.evaluateJavascript(url,null);
                }

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予麋鹿

2020-12-18 12:04

It looks like the MathJax variable won't be set until you load the <script> tag. You should move this into an onload listener. Something like:

<script type='text/x-mathjax-config'>
   function setupMathJax() {
     MathJax.Hub.Config(...);
   }
</script>
<script type='text/javascript' src='file:///android_asset/MathJax/MathJax.js'></script>
<body onload='setupMathJax()'>
<span id='math'></span>
</body>

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醉梦人生

2020-12-18 12:09

Perhaps the first <script> containing your function setupMathJax() is getting executed before your second <script> has loaded your MathJax file, causing the exception where MathJax is not defnied. Try reversing the order of those tags.

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