c# - WebBrowser InvokeScript - Stack Overflow

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I have a Webrowser with some settings that are changed using javascript. I'm trying to use the example here but can't get the correct syntax

the script looks like this

        <div class="DisplayInput"><input type="radio" name="displaytype" 
value="decimal" onclick="setdisplayType('decimal');" checked="checked"><a 
    href="javaScript:setdisplayType('decimal');" 
    onclick="s_objectID=&quot;javascript:setdisplayType('decimal');_1&quot;;return this.s_oc?     this.s_oc(e):true">Decimal</a></div>

So far I've tried these with no success

this.webBrowser1.InvokeScript("setdisplayType");
this.webBrowser1.InvokeScript("setdisplayType('decimal')");
this.webBrowser1.InvokeScript("setdisplayType","decimal");

I have a Webrowser with some settings that are changed using javascript. I'm trying to use the example here but can't get the correct syntax

the script looks like this

        <div class="DisplayInput"><input type="radio" name="displaytype" 
value="decimal" onclick="setdisplayType('decimal');" checked="checked"><a 
    href="javaScript:setdisplayType('decimal');" 
    onclick="s_objectID=&quot;javascript:setdisplayType('decimal');_1&quot;;return this.s_oc?     this.s_oc(e):true">Decimal</a></div>

So far I've tried these with no success

this.webBrowser1.InvokeScript("setdisplayType");
this.webBrowser1.InvokeScript("setdisplayType('decimal')");
this.webBrowser1.InvokeScript("setdisplayType","decimal");

• c#
• javascript

Share Improve this question Follow asked Sep 28, 2012 at 14:15 user857521user857521 5

• Where is your function setdisplayType defined? You don't show it anywhere. – aquinas Commented Sep 28, 2012 at 14:17
• What happens when you run the various InvokeScript calls? Is an error thrown? Does nothing happen? – David Hoerster Commented Sep 28, 2012 at 14:17
• The error shown is Unknown name. (Exception from HRESULT: 0x80020006 (DISP_E_UNKNOWNNAME)). Perhaps I've misunderstood the InvokeScript functionality? I'm attempting to click a radio button on the page that's already loaded into a WPF webbrowser. – user857521 Commented Sep 28, 2012 at 14:22
• 2 Unknown name happens when it can't find that function name. Are you sure you have that function on your page? Make sure this works for you: webBrowser1.InvokeScript("alert", "hello"); – aquinas Commented Sep 28, 2012 at 14:26
• Sorry everyone, the last version does work this.webBrowser1.InvokeScript("setdisplayType","decimal"); I used setDisplayType instead of setdisplayType. – user857521 Commented Sep 28, 2012 at 14:32

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3 Answers 3

Sorted by: Reset to default 7

Without knowing what's happening with your application's error and also not knowing what setdisplayType looks like, I'm guessing that maybe you're trying to invoke the function setdisplayType before it's been loaded. Per the MSDN documentation...

InvokeScript(String, Object()) should not be called before the document that implements it has finished loading. You can detect when a document has finished loading by handling the LoadCompleted event.

Maybe you can implement the LoadCompleted event handler and then invoke your script.

Hope this helps!

You have to pass an array of Object as second parameter. You can do it this way :

Object[] parameters = new Object[1]; //assuming your JS function has one parameter
parameters[0] = (Object)"yourStringParameter"; //for example the parameter is a string
yourBrowser.Document.InvokeScript("scriptName", parameters);

Try this:

private async void web_LoadCompleted(object sender, NavigationEventArgs e)
{
  Object[] parameters = new Object[1]; 
  await yourBrowser.Document.InvokeScript("scriptName", parameters);
}

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