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Reconnection of Client when server reboots in WebSocket
...
When the server reboots, the Web Socket connection is closed, so the JavaScript onclose event is triggered. Here's an example that tries to reconnect every five seconds.
function start(websocketServerLocation){
ws = new WebSocket(websocketServerLocation);
ws.onmessage = function(evt) { al...
ES6 class variable alternatives
... return this.constructor.MY_CONST;
}
constructor() {
alert(this.MY_CONST === this.constructor.MY_CONST);
}
}
alert(MyClass.MY_CONST);
new MyClass
// alert: string ; true
But if MY_CONST is reference type like static get MY_CONST() {return ['string'];} alert output is str...
Get GPS location from the web browser
...l informations at http://www.w3schools.com/html/html5_geolocation.asp
<script>
var x = document.getElementById("demo");
function getLocation() {
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(showPosition);
} else {
x.innerHTML = "Geolocation is ...
Check if a key exists inside a json object
...(("merchant_id" in thisSession)==false)
{
// do nothing.
}
else
{
alert("yeah");
}
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/in
http://www.w3schools.com/jsref/jsref_operators.asp
...
What steps should I take to protect my Google Maps API Key?
...
Considering that key has to be included in the <script> tags of your HTML pages, to load the JS files/data from google's servers, there is nothing you can do :
you must put it in your HTML files
every one can take a look at those.
Still, it doesn't really matter : i...
Getting a better understanding of callback functions in JavaScript
...) {
// "this" may be different depending how you call the function
alert(this);
};
callback(argument_1, argument_2);
callback.call(some_object, argument_1, argument_2);
callback.apply(some_object, [argument_1, argument_2]);
The method you choose depends whether:
You have the arguments...
How to replace DOM element in place using Javascript?
...ttp://www.stackoverflow.com">StackOverflow</a>
</div>
<script type="text/JavaScript">
var myAnchor = document.getElementById("myAnchor");
var mySpan = document.createElement("span");
mySpan.innerHTML = "replaced anchor!";
myAnchor.parentNode.replaceChild(mySpan, myAnch...
How to get jQuery dropdown value onchange event
I have added two jQuery UI Dropdown Autocomplete script. Now I want get both value onchange of second dropdown and want to store separately in variable. How it is possible?
...
How can I detect if a selector returns null?
...
if ( $("#anid").length ) {
alert("element(s) found")
}
else {
alert("nothing found")
}
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Get next / previous element using JavaScript?
How do I get the next element in HTML using JavaScript?
8 Answers
8
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