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Check if an image is loaded (no errors) with jQuery
...e you risk that the image might load (or encounter an error) before those callbacks are added, and they won't be called.
– callum
Feb 7 '12 at 11:32
19
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Fastest way to duplicate an array in JavaScript - slice vs. 'for' loop
...wer is vastly different. For example cloning an array of listeners before calling each of them. Those arrays are often small, usually 1 element.
– gman
Feb 13 '15 at 2:05
7
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How can I list ALL DNS records?
Is there any way I can list ALL DNS records for a domain?
8 Answers
8
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设备选择器（DevicePicker）使用指导 · App Inventor 2 中文网
...，将同名事件的处理合并到一个事件积木中。
when 按钮_选择设备.Click() {
DevicePicker1.ShowPicker()
}
when DevicePicker1.DeviceSelected(设备信息JSON) {
标签1.Text = 设备信息JSON
}
when DevicePicker1.Error(错误信息) {
标签1.Text = 错误信息
}
...
Accessing the web page's HTTP Headers in JavaScript
... exactly equal to the current.
Use the following JavaScript code to get all the HTTP headers by performing a get request:
var req = new XMLHttpRequest();
req.open('GET', document.location, false);
req.send(null);
var headers = req.getAllResponseHeaders().toLowerCase();
alert(headers);
...
How to get current working directory in Java?
... make passing in the directory to process very easy to do, and be able to fall back on user.dir if nothing was passed in.
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How to update the value stored in Dictionary in C#?
... answered Jun 17 '14 at 4:19
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Count characters in textarea
... relevance of IDs of textarea and second span : id="post" <-> id="rem_post" and the title of the span that holds the desired characters amount of each particular textarea
<textarea class="countit" name="post" id="post"></textarea>
<p>
<span>characters remaining: <...
Swift make method parameter mutable?
...eclare an inout parameter. Think: passing in a pointer.
func reduceToZero(_ x: inout Int) {
while (x != 0) {
x = x-1
}
}
var a = 3
reduceToZero(&a)
print(a) // will print '0'
This can be particularly useful in recursion.
Apple's inout declaration guidelines can be found...
Handling JSON Post Request in Go
...can't find an example of Go handling a POST request of JSON data. They are all form POSTs.
7 Answers
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