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Best way to detect when a user leaves a web page?
...lientY < 0)) {
//window.localStorage.clear();
//alert("Y coords: " + window.event.clientY)
}
};
In my example, I am clearing local storage and alerting the user with the mouses y coords, only when the browser is closed, this will be ignored on all page loads from...
How do I get the width and height of a HTML5 canvas?
...nt.getElementById( 'yourCanvasID' );
var ctx = canvas.getContext( '2d' );
alert( canvas.width );
alert( canvas.height );
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Long Press in JavaScript?
...emove("longpress");
if (longpress) {
return false;
}
alert("press");
};
var start = function(e) {
console.log(e);
if (e.type === "click" && e.button !== 0) {
return;
}
longpress = false;
this.classList.add("longpress");
if (presstime...
Return multiple values in JavaScript?
...s: dCodes,
dCodes2: dCodes2
};
}
var result = newCodes();
alert(result.dCodes);
alert(result.dCodes2);
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Access-Control-Allow-Origin error sending a jQuery Post to Google API's
...',
crossDomain: true,
dataType: 'jsonp',
success: function() { alert("Success"); },
error: function() { alert('Failed!'); },
beforeSend: setHeader
});
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TypeError: Cannot read property 'then' of undefined
...unction.
islogged:function(){
var cUid=sessionService.get('uid');
alert("in loginServce, cuid is "+cUid);
var $checkSessionServer=$http.post('data/check_session.php?cUid='+cUid);
$checkSessionServer.then(function(){
alert("session check returned!");
console.log("chec...
How to prevent buttons from submitting forms
...bmit and handling the event server-side - this is known as unobtrusive JavaScript.
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Check if object is a jQuery object
...t" },
b = $('body');
if ( a.jquery ) { // falsy, since it's undefined
alert(' a is a jQuery object! ');
}
if ( b.jquery ) { // truthy, since it's a string
alert(' b is a jQuery object! ');
}
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How can javascript upload a blob?
... actually don't have to use FormData to send a Blob to the server from JavaScript (and a File is also a Blob).
jQuery example:
var file = $('#fileInput').get(0).files.item(0); // instance of File
$.ajax({
type: 'POST',
url: 'upload.php',
data: file,
contentType: 'application/my-binary-typ...
Get the real width and height of an image with JavaScript? (in Safari/Chrome)
...ic = $('img');
pic.removeAttr("width");
pic.removeAttr("height");
alert( pic.width() );
alert( pic.height() );
});
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