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How and why does 'a'['toUpperCase']() in JavaScript work?
...
foo.bar and foo['bar'] are equal so the code you posted is the same as
alert('a'.toUpperCase())
When using foo[bar] (note tha lack of quotes) you do not use the literal name bar but whatever value the variable bar contains. So using the foo[] notation instead of foo. allows you to use a dynami...
Set custom HTML5 required field validation message
... {
if (!e.target[i].validity.valid)
{
window.alert(e.target.attributes.requiredmessage.value);
e.target.focus();
return false;
}
}
});
I hope this works or helps you in anyway.
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return, return None, and no return at all?
... of the prisoners. If we don't find the prisoner with a knife, we raise an alert. This could be done in many different ways and using return is probably not even the best way, but it's just an example to show how to use return for exiting a function.
def find_prisoner_with_knife(prisoners):
for...
Difference between $(this) and event.target?
...head>
<script>
function mouseDown() {
alert(this);
}
</script>
</head>
<body>
<p onmouseup="mouseDown();alert(this);">Hi</p>
</body>
</html>
The content of alert windows after renderi...
How to use a keypress event in AngularJS?
.....
$scope.myFunct = function(keyEvent) {
if (keyEvent.which === 13)
alert('I am an alert');
}
...
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Access event to call preventdefault from custom function originating from onclick attribute of tag
...).
A quick example.
function sayHi(e) {
e.preventDefault();
alert("hi");
}
<a href="http://google.co.uk" onclick="sayHi(event);">Click to say Hi</a>
Run it as is and notice that the link does no redirect to Google after the alert.
Then, change the event passed i...
Warn user before leaving web page with unsaved changes
...test page, make a change and hit refresh. It will display a native browser alert warning you that you have unsaved changes.
– TheLegendaryCopyCoder
Oct 9 '18 at 8:27
1
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What does href expression do?
...unches a javascript function(s)
<script>
function doSomething() {
alert("hello")
}
</script>
<a href="javascript:doSomething();">click me</a>
clicking the link will fire the alert.
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...
How can I create a simple message box in Python?
I'm looking for the same effect as alert() in JavaScript.
17 Answers
17
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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...