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JavaScript listener, “keypress” doesn't detect backspace?
...; document.activeElement !== 'text') {
e.preventDefault();
alert('Prevent page from going back');
}
});
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Implode an array with JavaScript?
...ters:
var bits = ['H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd'];
alert(bits.join()); // H,e,l,l,o, ,W,o,r,l,d
alert(bits.join('')); // Hello World
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What’s the difference between “Array()” and “[]” while declaring a JavaScript array?
... the constructor, you will get an array of that length:
x = new Array(5);
alert(x.length); // 5
To illustrate the different ways to create an array:
var a = [], // these are the same
b = new Array(), // a and b are arrays with length 0
c = ['foo', 'bar'], // these...
Microbit LED 矩阵 · App Inventor 2 中文网
...展程序让 App Inventor 用户能够以编程方式更改 BBC micro:bit 的 5x5 LED 矩阵，方法是编写自定义图案或输入文本字符串。显示屏的滚动速度也可以自定义。
更多链接：
下载 micro:bit LED 矩阵的示例项目。查看 micro:bit LED 矩阵的操作说...
What is the most efficient way to create HTML elements using jQuery?
...of an element
// see below statements
}
var end = new Date().getTime();
alert( end - start );
var e = $( document.createElement('div') ); // ~300ms
var e = $('<div>'); // ~3100ms
var e = $('<div></div>'); // ~3200ms
v...
How to get the focused element with jQuery?
...
Try this:
$(":focus").each(function() {
alert("Focused Elem_id = "+ this.id );
});
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Assign variable in if condition statement, good practice or not? [closed]
...(x = processorIntensiveFunction()) { // declaration inside if intended
alert(x);
}
Why should that function be allowed to run a 2nd time with:
alert(processorIntensiveFunction());
Because the first version LOOKS bad? I cannot agree with that logic.
...
Clearing using jQuery
...nt.getElementById("fileopen").addEventListener("change", function () {
alert("change");
}, false);
document.getElementById("clear").addEventListener("click", function () {
var fileopen = document.getElementById("fileopen"),
clone = fileopen.cloneNode(true);
fileopen.parentNode....
How can I determine the current line number in JavaScript?
... quick example (yes, it's messed a little).
function foo()
{
alert(line(1));
var a;
var b;
alert(line(2));
}
foo();
function line(mark)
{
var token = 'line\\(' + mark + '\\)';
var m = line.caller.toString().match(
new RegExp('(^(?!.*' + toke...
JSONP with ASP.NET Web API
...type: 'GET',
dataType: 'jsonp',
success: function (data) {
alert(data.MyProperty);
}
})
It seems to work very well.
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