Obtain the XPath of an element in angleSharp

Question

Obtain the XPath of an element in angleSharp

Is there a specific method to obtain the xPath of an angleSharp IElement

In order to pass an IElement to a JavaScript function, I require a way to convert the angleSharp element into a JavaScript DOM element.

function selectLevels(element, name, level){
    document.querySelectorAll("*").forEach(e => {
        if(e.isEqualNode(element)){
            e.setAttribute('level', level); 
            e.setAttribute('title', name);
        }
    })
}

My goal is to invoke this JavaScript function on the page by transferring an element from the C# code below. However, I encounter an error stating that angleSharp could not be found on the page.

IElement element = mainDoc.QuerySelector("strong");
Page.ClientScript.RegisterStartupScript(this.GetType(), "SelectLevel", "selectLevels('" + element + "', '" + name + "', '" + level + "')", true);

javascript c#xpath anglesharp

Answer 1

Answer №1

Suppose you have an HTML document containing JavaScript code and wish to invoke a global function in the JavaScript code from C#. The following example demonstrates how to achieve this using AngleSharp 0.15 and AngleSharp.Js 0.14:

        static async Task Main()
        {
            var html = @"<!DOCTYPE html>
<html>
  <head>
    <title>Test</title>
    <script>
    function selectLevels(element, name, level){
      element.dataset.level = level;
      element.dataset.title = name;
    }
    </script>
  </head>
  <body>
    <h1>Test</h1>
    <section data-level=1 data-title='section 1'>
      <h2>Section test</h2>
    </section>
  </body>
</html>";

            var jsService = new JsScriptingService();

            var config = Configuration.Default.With(jsService);

            var context = BrowsingContext.New(config);

            var document = await context.OpenAsync(req => req.Content(html));

            var selectLevels = jsService.GetOrCreateJint(document).GetValue("selectLevels");

            var jsElement = JsValue.FromObject(jsService.GetOrCreateJint(document), document.QuerySelector("section"));

            selectLevels.Invoke(jsElement, "2", "section 2");

            Console.WriteLine(document.DocumentElement.OuterHtml);
        }

In essence, you can retrieve the function using

jsService.GetOrCreateJint(document).GetValue("selectLevels");

and call it utilizing its Invoke method. For passing string arguments, use simple types and convert the IElement with JsValue.FromObject, for instance:

JsValue.FromObject(jsService.GetOrCreateJint(document), document.QuerySelector("section"))

.

Answer 2

Suppose you have an HTML document containing JavaScript code and wish to invoke a global function in the JavaScript code from C#. The following example demonstrates how to achieve this using AngleSharp 0.15 and AngleSharp.Js 0.14:

        static async Task Main()
        {
            var html = @"<!DOCTYPE html>
<html>
  <head>
    <title>Test</title>
    <script>
    function selectLevels(element, name, level){
      element.dataset.level = level;
      element.dataset.title = name;
    }
    </script>
  </head>
  <body>
    <h1>Test</h1>
    <section data-level=1 data-title='section 1'>
      <h2>Section test</h2>
    </section>
  </body>
</html>";

            var jsService = new JsScriptingService();

            var config = Configuration.Default.With(jsService);

            var context = BrowsingContext.New(config);

            var document = await context.OpenAsync(req => req.Content(html));

            var selectLevels = jsService.GetOrCreateJint(document).GetValue("selectLevels");

            var jsElement = JsValue.FromObject(jsService.GetOrCreateJint(document), document.QuerySelector("section"));

            selectLevels.Invoke(jsElement, "2", "section 2");

            Console.WriteLine(document.DocumentElement.OuterHtml);
        }

In essence, you can retrieve the function using

jsService.GetOrCreateJint(document).GetValue("selectLevels");

and call it utilizing its Invoke method. For passing string arguments, use simple types and convert the IElement with JsValue.FromObject, for instance:

JsValue.FromObject(jsService.GetOrCreateJint(document), document.QuerySelector("section"))

.

Obtain the XPath of an element in angleSharp

Answer №1

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