access global javascript variable in c# webbrowser

Question

I have a Javascript file that has a global variable which is set to some integer value. I load the Javascript in C# using a WebBrowser control. I need to display the value of the global variable in a WinForms Label.

I have tried putting the global variable in a hidden html field and calling the following C# code:

var distance = mapWebBrowser.Document.GetElementsByTagName("input")["distance"];

        if (distance != null)
            mileageText.Text = Convert.ToString(distance);

But this displays the System.Windows.Forms.HtmlElement in the label whereas I need the actual value stored inside it.

Can anyone help please?

possible duplicate of Read Javascript variable from Web Browser control — James Lawruk
– James Lawruk, Commented Feb 10, 2015 at 16:49

levelnis · Accepted Answer · 2012-11-28 13:47:39Z

2

Does giving the hidden field an id and calling this work? mapWebBrowser.Document.GetElementById("distance").InnerHtml (where distance is the id)

answered Nov 28, 2012 at 13:47

levelnis

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6 Comments

levelnis Over a year ago

No, that wouldn't work as hidden fields don't have InnerHtml - apologies. How about this? mapWebBrowser.Document.GetElementById("distance").GetAttribute("value")

user1696698 Over a year ago

This gives me an error: Object reference not set to an instance of an object.

levelnis Over a year ago

Could you post the HTML of the hidden field that you're storing the value in? The id might be different, especially if it's been generated from the server side.

user1696698 Over a year ago

HTML: <input type="hidden" id="distance" ></input> JavaScript: document.getElementById('distance').value = distance;

levelnis Over a year ago

It may not make a difference but could you make the input self-closing? Also, could the server-side code be trying to access the value before the javascript has written it to the hidden field?

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