a JavaScript error occurred while attempting to load the URL

In my experience, I have found that running a JavaScript function in a webview requires loading it using loadUrl(). Everything seems to work fine in my program when I use loadUrl to call the JavaScript. However, instead of executing the JavaScript on the same page, loadUrl("javascript:function()") causes the previous page to disappear and the JavaScript "function()" is executed on a completely new blank page.

For example, I attempted to automatically fill out a form using the command:

view.loadUrl("javascript:document.getElementById('password').value = 'my_passoword'");

What happens is that the page containing the ID-'password' disappears and a new blank page is created with only 'my_password' displayed.

The question remains: where is the problem occurring?

javascriptandroidwebview

Answer №1

Executing JavaScript with loadUrl results in loading a different page

Using an anonymous self-invoking function seems to be successful, like so:

view.loadUrl("javascript:(function(){document.getElementById('password').value = 'sb14november';})()");

I believe Bojan Kseneman's answer also offers a solution when wrapped in a loop.

Grateful for all the help! :)

Answer №2

UPDATE: I discovered that this particular library is designed solely for assessing JavaScript and it actually generates a new WebView instead of utilizing an existing one :/

If you're looking for an alternative, you might want to check out the js evaluator library

jsEvaluator.evaluate("insert your JavaScript code here", new JsCallback() {
  @Override
  public void onResult(final String result) {
    // receive the outcome in this section (if needed)
  }
});

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