Getting a "Uncaught SyntaxError: Unexpected identifier" from an Android hybrid app source is causing some frustration for me

After receiving a valid JSON from the server, an error message appears in Chromium:

"Uncaught SyntaxError: Unexpected identifier", source: (1)

Upon investigating, it seems that when calling the method below:

stringBuilder.append("javascript: javascriptBridge.getHandlers().showPost('");
stringBuilder.append(e.getData());
stringBuilder.append("');");
webView.loadUrl(stringBuilder.toString());

The issue arises with the e.getData() function, which contains the valid JSON data. It appears that something within the JSON is being misinterpreted as a JavaScript function parameter.

javascriptBridge.registerHandler('showPost', function (data) {
     alert('showpost'); //this is not called
});

It's puzzling because this method has worked successfully for other types of data and even for JSON in the past. Any suggestions on how to resolve this issue? There may be a specific character causing this unexpected behavior.

Answer №1

Through the assistance of commons-lang3, this issue was resolved with the following code snippet:

 StringBuilder builder = new StringBuilder();
 builder.append("javascript: javascriptBridge.getHandlers().showPost('");
 builder.append(StringEscapeUtils.escapeEcmaScript(e.getData()));
 builder.append("');");
 webView.loadUrl(builder.toString());

Answer №2

To solve the issue, use StringEscapeUtils.escapeEcmaScript function from Apache Commons library. Add the following dependency to your gradle:

implementation 'org.apache.commons:commons-lang3:3.4'

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