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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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How do I install pip on macOS or OS X?
...Got error #notsoeasy Download error on pypi.python.org/simple: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:590) -- Some packages may not be found! No local packages or download links found for pip error: Could not find suitable distribution for Requirement.parse('pip')
...
Run JavaScript when an element loses focus
...ut onblur event :
<input type="text" name="name" value="value" onblur="alert(1);"/>
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How to prevent buttons from submitting forms
...bmit and handling the event server-side - this is known as unobtrusive JavaScript.
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How can I convert a string to boolean in JavaScript?
... do:
String.prototype.bool = function() {
return strToBool(this);
};
alert("true".bool());
For those (see the comments) that would like to extend the String object to get this but are worried about enumerability and are worried about clashing with other code that extends the String object:
...
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...
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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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...
Return multiple values in JavaScript?
...s: dCodes,
dCodes2: dCodes2
};
}
var result = newCodes();
alert(result.dCodes);
alert(result.dCodes2);
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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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