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Android Webview - Change Elements with Javascript after page finished loading

I want to change some values on a HTML Page, using Javascript in a Webview.
I tried many different ways to evaluate Javscript after page finished loading.
Here is my code:
webview.getSettings().setJavaScriptEnabled(true);
webview.getSettings().setDomStorageEnabled(true);
webview.getSettings().setBlockNetworkImage(false);
webview.setWebViewClient(new WebViewClient() {
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
public void onPageFinished(WebView view, String url) {
webview.loadUrl("javascript:(function() { document.getElementById('options').value = '" + found.getId() + "'; ;})()");
button.performClick();
}
});
I think it means, that the method is called to early, before page is fully loaded.
Do you have any ideas?

in order to change value / content / styling in HTML using javascript also known as DOM Manipulate, then we have waiting after DOM ready or fully loaded. In this case, we load the page into widget WebView and then do our business.
I have a sample code that I always use in the same case,
...
final String url = "http://example.com";
final WebView webview = findViewById(R.id.my_webview);
final String myNewValue = "it works!";
webview.getSettings().setJavaScriptEnabled(true);
webview.setWebChromeClient(new WebChromeClient());
webview.setWebViewClient(new WebViewClient() {
#Override
public void onPageFinished(WebView view, String url) {
// Your custom javascript here
String myCustomJS = "document.getElementById('options').innerHTML = '" +
myNewValue + "'";
// here we execute the javascript code
webview.loadUrl("javascript:(function(){" + myCustomJS + "})()");
}
});
// and here we load the url
webview.loadUrl(url);
...
I hope the code above can help you to continue working..
Update for Waiting DOM Ready
If you have use jQuery before, then you must know
// example 1: jQuery way
$(document).ready(function() {
// place our logic here
});
// example 2: native javascript way
document.addEventListener('DOMContentLoaded', function() {
// place our logic here
});
Im use this trick to manipulate page in WebView after DOM ready (in example 2 native JS way).
Another question why not using runnable?
because we never know internet speed users, let say if we set runnable to wait 3000ms or 3sec but the web not responding after runnable execution. What happened next? users will have white blank screen and keep waiting.
hope this more clear now.
reference link: https://developer.mozilla.org/.../DOMContentLoaded_event

Execute javascript after loading generic handler asp.net

I have a gridview with a list of pdf files. When the user clicks a pdf, it displays the file inline on the page. I want to execute some javascript after the pdf has been loaded but I cannot get this to work. The issue is that the pdf loads after everything else, so the load event fires before the pdf begins to load.
My first approach was to use an iframe. The inner page would retrieve the file and write the data to the response. As mentioned previously, the load event occurred before loading the pdf and I need it to trigger after. The current code uses a generic handler ashx to load the pdf inline. How do I trigger an event to execute javascript, after the pdf data is loaded server side from the ashx generic handler?
Aspx page:
protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "View")
{
int index = Convert.ToInt32(e.CommandArgument.ToString());
string Id = GridView1.DataKeys[index].Value.ToString();
HtmlGenericControl myObject = new HtmlGenericControl();
myObject.TagName = "object";
Panel1.Controls.Add(myObject);
myObject.Attributes.Add("data", "GetPdf.ashx?Id=" + Id);
}
}
Generic handler ashx:
public void ProcessRequest(HttpContext context)
{
System.Diagnostics.Debug.WriteLine("GetPdf.ashx started");
string Id = context.Request.QueryString["Id"];
byte[] data = GetPdf(Id);
context.Response.ClearContent();
context.Response.ContentType = "application/pdf";
context.Response.AppendHeader("Content-disposition", "inline");
context.Response.AddHeader("Content-Length", data.Length.ToString());
context.Response.BinaryWrite(data);
System.Diagnostics.Debug.WriteLine("GetPdf.ashx is done");
context.Response.End();
}

Have you tried setting an event handler for the object tag's onload event? I'm not sure if that will work across all browsers, but I also don't know which browsers you require it to work on.
Worst-case scenario you could use setTimeout to rapidly poll for the PDF's existence.
Here's a previous answer that may help you with both aspects.

Android - Javascript: how to execute jquery in webview

I'm building an app which load a webpage in a webview.
In that webpage, i need to programmatically click on some links using Jquery.
Now, i know how to execute a Javascript code on the webview programmatically (see below):
WebSettings myBrowserSettings = myBrowser.getSettings();
myBrowserSettings.setJavaScriptEnabled(true);
Log.d("Stefano", "JS enabled");
myBrowser.loadUrl("javascript:document.getElementsByid('myWord').click();");
But now, I need to know how implement a Jquery function in my webview; i'm looking for the correct way to manage something like:
myBrowser.loadUrl("jquery:function($("#myAnchor").click(function(event){})");
And which is the correct way to implement the following function?
$("#a_link")[0].click();

If jquery loaded in this page, you can just call this:
webview.setWebViewClient(new WebViewClient() {
#Override
public void onPageFinished(WebView view, String url) {
webview.loadUrl("javascript:(function() { " +
"$("#myAnchor").click(function(event){}" +
"})()");
}
});

What's your problem? It's about escaping characters?
myBrowser.loadUrl("jquery:function($(\"#myAnchor\").click(function(event){})");

How to filter javascript from specific urls in HtmlUnit

HtmlUnit takes lot of time to execute javascript, i would like to know if its possible to make HtmlUnit not to load javascript from url regex filters.

Not exactly, you can't only disable javascript as a whole (probably you already know it):
final WebClient webClient = new WebClient();
webClient.getOptions().setJavascriptEnable(false);
but you can use a ScriptPreProcessor the javascript, and erase what you don't want:
webClient.setScriptPreProcessor(new ScriptPreProcessor() {
#Override
public String preProcess(HtmlPage htmlPage, String sourceCode, String sourceName, int lineNumber, HtmlElement htmlElement) {
if (match...)
return "";
}
});

textbox id of user control in external java script

i am making a user control dynamically.
var controlMarkup = string.Empty;
Page page = new Page();
var customControl = page.LoadControl(control) as UserControl;
if (customControl != null)
{
var htmlForm = new HtmlForm();
var output = new StringWriter();
//output.Write("<div id = 'ControlName'>" + customControl + "</div>");
htmlForm.Controls.Add(customControl);
page.Controls.Add(htmlForm);
HttpContext.Current.Server.Execute(page, output, false);
controlMarkup = output.ToString();
}
return controlMarkup;
nut now i want to get the textbox id of user control in external javascript can anyone help me to get the id of control.

Try this $get("<%=lblDistance.ClientID%>")

The client-side ID can be found in the ClientID property. For example, you can hide a control called txtDistance using jQuery in the .aspx page like:
$('#<%= lblDistance.ClientID %>').hide();

If you are using .net 4.0 add ClientIDMode="Static" to your control.
Something like:
yourControlname.Attributes.Add("ClientIDMode", "Static");
For previous version of .net, because you are using external javascript you have two options
Use hidden input to store clientId's
View HTML produced by your page and use those Id's in your external javascripts

I have got the solution of this Problem i just use the javascriptserializer to get the client id's of the dynamic control its very good approach because RegisterCLientScript is a methos which write the string from JavaScript Serializer on the page then u can easily get ur desired ID,s of the dynamic Control