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How to override a JavaScript function
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var origParseFloat = parseFloat;
parseFloat = function(str) {
alert("And I'm in your floats!");
return origParseFloat(str);
}
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How to escape single quotes within single quoted strings
...d reopens the string.
I often whip up a "quotify" function in my Perl scripts to do this for me. The steps would be:
s/'/'\\''/g # Handle each embedded quote
$_ = qq['$_']; # Surround result with single quotes.
This pretty much takes care of all cases.
Life gets more fun when you introd...
Code for a simple JavaScript countdown timer?
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I wrote this script some time ago:
Usage:
var myCounter = new Countdown({
seconds:5, // number of seconds to count down
onUpdateStatus: function(sec){console.log(sec);}, // callback for each second
onCounterEnd: function(...
rails i18n - translating text with links inside
...f Rails.env.test?
nil
end
end
In the controller:
flash.now[:alert] = t("path.to.translation")
flash.now[:alert_link] = here_comes_the_link_path # or _url
In the locale.yml:
path:
to:
translation: "string with __link__ in the middle"
In the view:
<%= render_flash_message...
How do I resolve a HTTP 414 “Request URI too long” error?
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Here is a working example:
ajaxPOST.html:
<html>
<head>
<script type="text/javascript">
function ajaxPOSTTest() {
try {
// Opera 8.0+, Firefox, Safari
ajaxPOSTTestRequest = new XMLHttpRequest();
} catch (e) {
// Internet Ex...
How to inspect Javascript Objects
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There are few methods :
1. typeof tells you which one of the 6 javascript types is the object.
2. instanceof tells you if the object is an instance of another object.
3. List properties with for(var k in obj)
4. Object.getOwnPropertyNames( anObjectToInspect )
5. Object.getPrototypeOf( ...
Are there legitimate uses for JavaScript's “with” statement?
...s:
for (var i=0; i<3; ++i)
{
var num = i;
setTimeout(function() { alert(num); }, 10);
}
Because the for loop does not introduce a new scope, the same num - with a value of 2 - will be shared by all three functions.
A new scope: let and with
With the introduction of the let statement in ES6...
registerForRemoteNotificationTypes: is not supported in iOS 8.0 and later
...I have is the pre-release documentation: "Apps that use visible or audible alerts in conjunction with a local or push notification must register the types of alerts they employ." As to "why," I only have my interpretation: end-user convenience to not be bothered by messages, regardless of source.
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Explanation of [].slice.call in javascript?
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In JavaScript, methods of an object can be bound to another object at runtime. In short, javascript allows an object to "borrow" the method of another object:
object1 = {
name: 'Frank',
greet() {
alert(`Hello ${this...
JavaScript: filter() for Objects
...type
Object.prototype.extended = "I'm everywhere!";
// See the result
alert( {}.extended ); // "I'm everywhere!"
alert( [].extended ); // "I'm everywhere!"
alert( new Date().extended ); // "I'm everywhere!"
alert( 3..extended ); // "I'm everywhere!"
alert( true.exten...