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How to list the properties of a JavaScript object?
...object had about a million properties, most of them not used, and I had an alert on it.
– Mark Henderson
Aug 16 '10 at 6:10
...
How do I return the response from an asynchronous call?
...he callback is called.
Solution(s)
Embrace the asynchronous nature of JavaScript! While certain asynchronous operations provide synchronous counterparts (so does "Ajax"), it's generally discouraged to use them, especially in a browser context.
Why is it bad do you ask?
JavaScript runs in the UI thr...
AsyncTask and error handling on Android
...oid onPostException(Exception exception)
{
new AlertDialog.Builder(context).setTitle(R.string.dialog_title_generic_error).setMessage(exception.getMessage())
.setIcon(android.R.drawable.ic_dialog_alert).setPositiveButton(R.string.alert_dialog_ok, new Dialog...
Interface type check with Typescript
...ber' in object;
}
var a:any={member:"foobar"};
if (instanceOfA(a)) {
alert(a.member);
}
Lots of Members
If you need to check a lot of members to determine whether an object matches your type, you could instead add a discriminator. The below is the most basic example, and requires you to man...
iOS Detection of Screenshot?
.... You can remove the image in this delegate method and show an appropriate alert to the user.
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
[super touchesCancelled:touches withEvent:event];
NSLog(@"Touches cancelled");
[self.imageView removeFromSuperView]; //a...
How do you tell if caps lock is on using JavaScript?
... === s && s.toLowerCase() !== s && !e.shiftKey ) {
alert('caps is on');
}
});
Avoid the mistake, like the backspace key, s.toLowerCase() !== s is needed.
share
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impro...
Difference between json.js and json2.js
...7.
In json2007:
var array = [];
array[1] = "apple";
array[2] = "orange";
alert(array.toJSONString()); // Output: ["apple", "orange"].
In json2:
var array = [];
array[1] = "apple";
array[2] = "orange";
alert(JSON.stringify(array)); // Output: [null, "apple", "orange"].
...
Is it possible to send a variable number of arguments to a JavaScript function?
...ly, like so (c.f. Functional Javascript):
var otherFunc = function() {
alert(arguments.length); // Outputs: 10
}
var myFunc = function() {
alert(arguments.length); // Outputs: 10
otherFunc.apply(this, arguments);
}
myFunc(1,2,3,4,5,6,7,8,9,10);
...
How can I convert JSON to a HashMap using Gson?
... single-quotes and removed whitespace):
String jsonString = "{'header': {'alerts': [{'AlertID': '2', 'TSExpires': null, 'Target': '1', 'Text': 'woot', 'Type': '1'}, {'AlertID': '3', 'TSExpires': null, 'Target': '1', 'Text': 'woot', 'Type': '1'}], 'session': '0bc8d0835f93ac3ebbf11560b2c5be9a'}, 'res...
How to print out the method name and line number and conditionally disable NSLog?
...
I've taken DLog and ALog from above, and added ULog which raises a UIAlertView message.
To summarize:
DLog will output like NSLog only when the DEBUG variable is set
ALog will always output like NSLog
ULog will show the UIAlertView only when the DEBUG variable is set
#ifdef DEBUG
# d...