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Is using 'var' to declare variables optional? [duplicate]
...he differences:
external = 5;
function firsttry() {
var external = 6;
alert("first Try: " + external);
}
function secondtry() {
external = 7;
alert("second Try: " + external);
}
alert(external); // Prints 5
firsttry(); // Prints 6
alert(external); // Prints 5
secondtry(); // Prints 7
aler...
How to add a touch event to a UIView?
...l.text = "Long press recognized"
// example task: show an alert
if gesture.state == UIGestureRecognizerState.began {
let alert = UIAlertController(title: "Long Press", message: "Can I help you?", preferredStyle: UIAlertControllerStyle.alert)
alert.add...
creating list of objects in Javascript
Is it possible to do create a list of your own objects in Javascript ? This is the type of data I want to store :
5 Ans...
How to use knockout.js with ASP.NET MVC ViewModels?
...y of the input control with the CourseId property from your model and your script model
The result is:
<input data-bind="value: CourseId" data-val="true" data-val-number="The field CourseId must be a number." data-val-required="The CourseId field is required." id="CourseId" name="CourseId" type=...
if (key in object) or if(object.hasOwnProperty(key)
... title: "High Performance JavaScript",
publisher: "Yahoo! Press"
};
alert(book.hasOwnProperty("title")); //true
alert(book.hasOwnProperty("toString")); //false
alert("title" in book); //true
alert("toString" in book); //true
In this code, hasOwnProperty() returns true when “title”...
How to add calendar events in Android?
...der, boolean needMailService) {
/***************** Event: note(without alert) *******************/
String eventUriString = "content://com.android.calendar/events";
ContentValues eventValues = new ContentValues();
eventValues.put("calendar_id", 1); // id, We need to choose from
...
What does 'var that = this;' mean in JavaScript?
...
var usesthat = new usesThat('Dave');
var usesthis = new usesThis('John');
alert("UsesThat thinks it's called " + usesthat.returnMe().myName + '\r\n' +
"UsesThis thinks it's called " + usesthis.returnMe().myName);
This alerts...
UsesThat thinks it's called Dave
UsesThis thinks it's ...
Detect the Internet connection is offline?
...d approach is to retry the request a few times. If it doesn't go through, alert the user to check the connection, and fail gracefully.
Sidenote: To put the entire application in an "offline" state may lead to a lot of error-prone work of handling state.. wireless connections may come and go, etc. ...
Local Storage vs Cookies
...eds this data — the client or the server?
If it's your client (your JavaScript), then by all means switch. You're wasting bandwidth by sending all the data in each HTTP header.
If it's your server, local storage isn't so useful because you'd have to forward the data along somehow (with Ajax or h...
How can a Javascript object refer to values in itself? [duplicate]
...it ",
key2: function() {
return this.key1 + " works!";
}
};
alert(obj.key2());
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