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How to check for an undefined or null variable in JavaScript?
... property doesn't yield an error and simply returns undefined, which, when converted to a boolean, evaluates to false. So, if you don't care about
0 and false, using if(obj.undefProp) is ok. There's a common idiom based on this fact:
value = obj.prop || defaultValue
which means "if obj has the p...
How to get share counts using graph API
...e fql end-point (the link_stat table):
https://graph.facebook.com/fql?q=SELECT url, normalized_url, share_count, like_count, comment_count, total_count,commentsbox_count, comments_fbid, click_count FROM link_stat WHERE url='http://www.google.com'
total_count is the number that shows in the Like...
How to show google.com in an iframe?
...t('script');
script.src = 'https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20data.headers%20where%20url%3D%22' + encodeURIComponent(url) + '%22&format=json&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&callback=getData';
document.body.app...
AsyncTask and error handling on Android
I'm converting my code from using Handler to AsyncTask . The latter is great at what it does - asynchronous updates and handling of results in the main UI thread. What's unclear to me is how to handle exceptions if something goes haywire in AsyncTask#doInBackground .
...
Forking from GitHub to Bitbucket
...epo on bitbucket.org
Here are the steps:
Click on the Create button and select Repository ('+' > Repository)
Now, instead of creating a new repository select a import repository from the top right corner of the modal that pops up.
fill in your github repo's URL and your authentication credenti...
How do you produce a .d.ts “typings” definition file from an existing JavaScript library?
...ucco-and-Luke-Hoban-Inside-TypeScript at 00:33:52 they had built a tool to convert WebIDL and WinRT metadata into TypeScript d.ts
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How to use a variable for a key in a JavaScript object literal?
... 'theTop' : 10 }
The PropertyName theTop is an IdentifierName, so it gets converted to the 'theTop' string value, which is the string value of 'theTop'.
It is not possible to write object initializers (literals) with variable keys.
The only three options are IdentifierName (expands to string liter...
How can I trigger a JavaScript event click
...
To repeat the click more than once: Add an ID to the element to uniquely select it:
<a href="#" target="_blank" id="my-link" onclick="javascript:Test('Test');">Google Chrome</a>
and call the .click() method in your JavaScript code via a for loop:
var link = document.getElementById(...
Which exception should I raise on bad/illegal argument combinations in Python?
... @RayLuo you may have sanity-checked what the video's saying and converted it into a palateable, sensible alternative message, but that is what the video says, and it's what someone who doesn't have a lot of experience and common sense will come away with.
– Rob Grant...
HTML text input allow only numeric input
...x, inputFilter) {
["input", "keydown", "keyup", "mousedown", "mouseup", "select", "contextmenu", "drop"].forEach(function(event) {
textbox.addEventListener(event, function() {
if (inputFilter(this.value)) {
this.oldValue = this.value;
this.oldSelectionStart = this.selecti...