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Injecting jquery in EO webbrowser Options
Posted: Wednesday, January 11, 2023 12:21:17 PM
Rank: Newbie
Groups: Member

Joined: 7/31/2017
Posts: 2
Hi Support,
I am having hard time in injecting jquery after load url is complete . Let me show you my code.
I have tried two ways.
first i tried
Code: C#
public WebView webView { get; set; }
 if (listSiteIds.Count > 0)
                ParallelOptions parallelOptions = new ParallelOptions
                    MaxDegreeOfParallelism = 50
                Parallel.ForEach(listSiteIds, parallelOptions, siteId =>
                    var eoThreadRunner = new ThreadRunner(siteId.ToString());

                    eoThreadRunner.Send(() =>
                        previewTasks.Add(Task.Factory.StartNew(() =>
                            previewGenerator = new PreviewGeneratorEOHeadless(eoThreadRunner.CreateWebView(), siteId);

                _defaultDelay = minDelayInSeconds;
 public async Task StartPreviewingAsync(){
// do some initialization and load url

private string GetJqueryVersion()
                return webView.EvalScript("return $.fn.Jquery").ToString();
            catch (Exception exception)

            return "";
public void InjectJquery(){
 string jQueryUrl = string.Format("window.setTimeout(function() {{ {0} }}, 5);", Properties.Resources.jquery_min); ;
webView.EvalScript($"var jq = document.createElement('script'); jq.src = '{jQueryUrl}'; document.getElementsByTagName('head')[0].appendChild(jq);");

GetJqueryVersion always return nothing it should return the version of jquery

second thing tried
Code: C#
string jqueryUrl = JsPath + "jqueryMinv1_11_2.js";
                    webView.EvalScript("var script = document.createElement('script');" +
                                   "script.src = '" + jqueryUrl + "';" +

and when i invoke jquery function it gives exception $ is not defined whats wrong with the code
Posted: Wednesday, January 11, 2023 12:42:21 PM
Rank: Administration
Groups: Administration

Joined: 5/27/2007
Posts: 23,576

You should not use Async methods to call EvalScript. EvalScript should be called inside the same thread as the WebView (directly inside your eoThreadRunner.Send or Post).

If that does not resolve the issue, you can try to use the built-in debuging feature to debug the web page and see if any error has occurred in the script code:



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