javascript and loadUrl error

Question

i know that to run a javascript function in webview we need to load it in loadUrl(). In my program everything works fine javascript gets called when i use it in loadUrl, but instead of running javascript on the same page, loadUrl("javascript:function()") vanishes my previous page and run this javascript "function()" in a totally new blank page..

for eg. i tried to fill a form automatically using command:

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

what happens is, the page which consists of ID-'password' vanishes and a new blank page generates consisting of 'my_password' only

where is the problem?

Try creating a function that sets the value of the input field and call that. Maybe Android does not like to evaluate the function in load url. — Bojan Kseneman
– Bojan Kseneman, Commented May 21, 2015 at 18:45
problem is it's not my site... I'm trying to make some kind of auto login system in my app using my college's website.. i cannot create my own function or change the website coding... — phoenisx
– phoenisx, Commented May 21, 2015 at 18:48
Why not? You can retrive the contents of the website, save jt to string, inject your JavaScript and load it in the webview — Bojan Kseneman
– Bojan Kseneman, Commented May 21, 2015 at 19:02
i think your way would work too, but it would be slow, as i have to login and navigate through two more pages and retrieve data.. as soon as possible. — phoenisx
– phoenisx, Commented May 21, 2015 at 19:17
Possible duplicate of Android WebView always returns null for javascript getElementById on loadUrl — rogerdpack
– rogerdpack, Commented Oct 10, 2017 at 5:03

Community · Accepted Answer · 2017-05-23 12:14:19Z

2

Using loadUrl to run javascript loads different page

anonymous self-invoking function works fine.. i.e.

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

and as a loop around i think Bojan Kseneman answer will work too..

thanks to all!! :)

edited May 23, 2017 at 12:14

CommunityBot

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answered May 21, 2015 at 19:27

phoenisx

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Comments

Bojan Kseneman · Accepted Answer · 2015-05-21 19:49:38Z

2

EDIT: This library is only for evaluating JavaScript and it created a new WebView instead of using an existing one :/

You can also try js evaluator library

jsEvaluator.evaluate("put your JavaScript code", new JsCallback() {
  @Override
  public void onResult(final String result) {
    // you get the result here (optional)
  }
});

edited May 21, 2015 at 19:49

answered May 21, 2015 at 19:30

Bojan Kseneman

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3 Comments

phoenisx Over a year ago

what is the API support for this library

Bojan Kseneman Over a year ago

Supports Android version 3.0 (Honeycomb) and newer.

Bojan Kseneman Over a year ago

@SubrotoBiswas Sorry, this library is no good. It creates a new WebView instead of using an existing one :/

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