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Is it possible to override JavaScript's toString() function to provide meaningful output for debuggi
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While it is true the alert function will display the return value of the function overriding the prototype toString property, Object.prototype.toString.call(f) will still display [object Object].
– Frederik Krautwald
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Is JavaScript guaranteed to be single-threaded?
... because you called focus() directly, they could happen because you called alert(), or opened a pop-up window, or anything else that moves the focus.
This can also result in other events. For example add an i.onchange listener and type something in the input before the focus() call unfocuses it, an...
Remove json element
...te the JSON as follows:
var bleh = {first: '1', second: '2', third:'3'}
alert(bleh.first);
delete bleh.first;
alert(bleh.first);
Alternatively, you can also pass in the index to delete an attribute:
delete bleh[1];
However, to understand some of the repercussions of using deletes, have a ...
Check if object exists in JavaScript
... returns a string.
Therefore
if (typeof maybeObject != "undefined") {
alert("GOT THERE");
}
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Comparing date part only without comparing time in JavaScript
... now.getUTCDate() ));
if(userEntered.getTime() < today.getTime())
alert("date is past");
else if(userEntered.getTime() == today.getTime())
alert("date is today");
else
alert("date is future");
}
</script>
See it running...
Update 2019... free stuff...
Given the popularit...
SSL handshake alert: unrecognized_name error since upgrade to Java 1.7.0
... in startHandshake(), get the exception message. If it equals to handshake alert: unrecognized_name, then you have found a misconfigured server.
When you have received the unrecognized_name warning (fatal in Java), retry opening a SSLSocket, but this time without a host name. This effectively disab...
How should I call 3 functions in order to execute them one after the other?
...e this is equivalent to the following:
window.setTimeout(function() {
alert("!");
// set another timeout once the first completes
window.setTimeout(function() {
alert("!!");
}, 1000);
}, 3000); // longer, but first
Here's a general asynchronous looping function. It will ca...
Is there a “null coalescing” operator in JavaScript?
...he assignment will use the second operand. Beware of all the cases below:
alert(Boolean(null)); // false
alert(Boolean(undefined)); // false
alert(Boolean(0)); // false
alert(Boolean("")); // false
alert(Boolean("false")); // true -- gotcha! :)
This means:
var whatIWant = null || new ShinyObject...
Call js-function using JQuery timer
...this:
window.setInterval(yourfunction, 10000);
function yourfunction() { alert('test'); }
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Is there a sleep function in JavaScript? [duplicate]
...d have a sleep function..
// sleep for 3 seconds
sleep(3000);
alert('hi');
}
If you run the above function, you will have to wait for 3 seconds (sleep method call is blocking) before you see the alert 'hi'. Unfortunately, there is no sleep function like that in JavaScript.
function ...