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What does the question mark and the colon (?: ternary operator) mean in objective-c?
... ternary operator is that it can be used in places that an if-else cannot. ie: Inside a condition or method parameter. [NSString stringWithFormat: @"Status: %@", (statusBool ? @"Approved" : @"Rejected")] ...which is a great use for preprocessor constants: #define statusString (statusBool ? @"Appr...
How to focus on a form input text field on page load using jQuery?
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Set focus on the first text field:
$("input:text:visible:first").focus();
This also does the first text field, but you can change the [0] to another index:
$('input[@type="text"]')[0].focus();
Or, you can use the ID:
$("#someTextBox").focus();
...
Capture Signature using HTML5 and iPad
...had 3 votes. github.com/szimek/signature_pad
– VAdaihiep
Aug 2 '13 at 10:17
3
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Parsing JSON from XmlHttpRequest.responseJSON
...with jsonResponse
});
Compatibility: The Fetch API is not supported by IE11 as well as Edge 12 & 13. However, there are polyfills.
New ways II: responseType
As Londeren has written in his answer, newer browsers allow you to use the responseType property to define the expected format of the...
list every font a user's browser can display
...s there a way in javascript to obtain the names of all fonts (or font-families) that the browser can show? (I want to give the user a dropdown with a list of all available fonts, and allow the user to choose a font.)
I'd prefer not to have to hardcode this list ahead of time or send it down from th...
how to get the host url using javascript from the current page
...de port also. This is great mini tool to see link anatomy bl.ocks.org/abernier/3070589
– Lukas Liesis
Apr 11 '16 at 5:00
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How to check if array element exists or not in javascript?
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Unfortunately, this one doesn't work in IE 7 and below.
– darksoulsong
Oct 7 '14 at 15:21
4
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Intercept page exit event
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Similar to Ghommey's answer, but this also supports old versions of IE and Firefox.
window.onbeforeunload = function (e) {
var message = "Your confirmation message goes here.",
e = e || window.event;
// For IE and Firefox
if (e) {
e.returnValue = message;
}
// For Safari
r...
Converting between strings and ArrayBuffers
Is there a commonly accepted technique for efficiently converting JavaScript strings to ArrayBuffers and vice-versa? Specifically, I'd like to be able to write the contents of an ArrayBuffer to localStorage and to read it back.
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Get the string representation of a DOM node
...ch. So simple... Just a little note: If I want the whole document "stringified", I can use the same method with document.documentElement (usecase: AJAX requests). Perhaps you could incorporate that in the answer?
– Boldewyn
Nov 17 '09 at 18:36
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