Call/generate dynamic javascript from silverlight

Question

I'm not sure this is supported but wanted to see if any of you had come up with something creative to work around this.

Is there a way to call javascript from silverlight, without having to define any javascript functions on the aspx page/external js?

I'd like to be able to do something like:

HtmlPage.Window.Invoke("(function () { window.lastErrorMessage = 'foo'; })();")

Which, to forgo conversations about style, I'd agree goes against many best practices rules, but my current purpose is brainstorm some quick-and-dirty error reporting (could you even call it reporting?) before we implement the existing database-centric error logging in this solution.

Any thoughts? The idea is to generate something discreet that a user wouldn't feel intruded upon or something too technical (like IE's script error dialog), but something our app support could get a little more info from without access to code bases etc.

Thanks, Matthew

AnthonyWJones · Accepted Answer · 2011-08-16 14:10:26Z

4

The method you are looking for is Eval not Invoke:-

HtmlPage.Window.Eval("(function () { window.lastErrorMessage = 'foo'; })();")

answered Aug 16, 2011 at 14:10

AnthonyWJones

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2 Comments

iCollect.it Ltd Over a year ago

+1: I had a typo that meant I did not get Eval to work, hence the longer workaround. sigh :)

mlhDev Over a year ago

can i -1 on google for not bringing this to my attention earlier? :) That's exactly what i was looking for - googling "silverlight call javascript" always brings up invoke - thanks!

iCollect.it Ltd · Accepted Answer · 2011-08-16 14:39:51Z

3

You could add your JavaScript dynamically to the hosting page DOM using HtmlPage.Document and then execute your added methods. Or are you trying not to modify the page at all?

            HtmlElement head = HtmlPage.Document.GetElementsByTagName("head")[0] as HtmlElement;
            HtmlDocument htmlDocument = HtmlPage.Document;
            HtmlElement scriptElement = htmlDocument.CreateElement("script");
            scriptElement.SetAttribute("type", @"text/javascript");
            scriptElement.SetProperty("text", "function testMe(p) { alert(p); }");
            head.AppendChild(scriptElement);
            // Invoke like this
            HtmlPage.Window.Invoke("testMe", "hello");

answered Aug 16, 2011 at 14:39

iCollect.it Ltd

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1 Comment

mlhDev Over a year ago

+1: this is still cool enough I may use it somewhere else. I use jQuery so much i forget that modifying the DOM is a normal part of web dev life.

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