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i am new to this and i am creating simple application in which i click a button and a notification on desktop should be displayed. i am doing this in windows form c#
the error is " NullReferenceException was unhandled
i have one button Notify in form1. i have tried this:
form1.cs
public Form1()
{
InitializeComponent();
this.Load += new EventHandler(Form1_Load);
webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
webBrowser1.ScriptErrorsSuppressed = true;
}
private void btnNotify_Click(object sender, EventArgs e)
{
webBrowser1.Document.InvokeScript("notifyMe");
}
private void Form1_Load(object sender, EventArgs e)
{
string CurrentDirectory = Directory.GetCurrentDirectory();
webBrowser1.Navigate(Path.Combine(CurrentDirectory,"HTMLPage1.html"));
}
private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
webBrowser1.ObjectForScripting = this;
code for HTMLPage1.html :
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<title></title>
<script language="javascript" type="text/javascript">
document.addEventListener('DOMContentLoaded', function () {
if (Notification.permission !== "granted")
Notification.requestPermission();
});
function notifyMe() {
if (!Notification) {
alert('Desktop notifications not available in your browser. Try Chromium.');
return;
}
if (Notification.permission !== "granted")
Notification.requestPermission();
else {
var notification = new Notification('Notification title', {
icon: 'http://cdn.sstatic.net/stackexchange/img/logos/so/so-icon.png',
body: "Hey there! You've been notified!",
});
notification.onclick = function () {
window.open("http://stackoverflow.com/a/13328397/1269037");
};
}
}
</script>
</head>
<body>
</body>
</html>
even if i simply put alert("Hi") in notifyMe() function, nothing else. still it displays the same error.
510
I have tried your code.. you should use
document.attachEvent('DOMContentLoaded', function () {..
Instead of
document.addEventListener("..
That worked from here...read more about it here https://stackoverflow.com/a/1695383/4155741
you should also remove that comma at the end of .. body: "Hey there! You've been notified!", as it prevent the script from be compiled.
63
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