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动态组件使用指导 · App Inventor 2 中文网
...一排按钮
设计器里放一个垂直布局 垂直布局_容器：
各案例独立使用；组合到同一屏幕时，将同名事件的处理合并到一个事件积木中。
global fruits = ["苹果", "香蕉", "橙子"]
when Screen1.Initialize() {
foreach name in fruits {
...
How to detect if URL has changed after hash in JavaScript
... you can do
$(window).bind('hashchange', function() {
/* things */
});
http://benalman.com/projects/jquery-hashchange-plugin/
Otherwise yes, you would have to use setInterval and check for a change in the hash event (window.location.hash)
Update! A simple draft
function hashHandler(){
thi...
How can I change a file's encoding with vim?
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
Use 'import module' or 'from module import'?
... * can be particularly useful, if using it as: if(windows):\n\t from module_win import * \n else: \n\t from module_lin import *. Then your parent module can potentially contain OS independent function names, if the function names in module_lin & module_win have same names. It's like conditionall...
How to get the sizes of the tables of a MySQL database?
...ork for the InnoDB storage engine? According to mysql doc here - dev.mysql.com/doc/refman/5.7/en/show-table-status.html, the data_length field for that engine contains the size of the clustered index. That won't correctly represent the size of the data. Will it?
– euphoria83
...
Animate text change in UILabel
...^{
self.label.text = rand() % 2 ? @"Nice nice!" : @"Well done!";
} completion:nil];
Swift 3, 4, 5
UIView.transition(with: label,
duration: 0.25,
options: .transitionCrossDissolve,
animations: { [weak self] in
self?.label.text = (arc...
Rails find_or_create_by more than one attribute?
...ll of these were factored out of rails just the attribute specific ones.
https://github.com/rails/rails/blob/4-2-stable/guides/source/active_record_querying.md
Example
GroupMember.find_or_create_by_member_id_and_group_id(4, 7)
became
GroupMember.find_or_create_by(member_id: 4, group_id: 7)
...
Access an arbitrary element in a dictionary in Python
...
this looks better: dict.values().__iter__().__next__() :)
– Vitaly Zdanevich
Mar 3 '17 at 14:26
...
do N times (declarative syntax)
...s 2017, you may use ES6:
[1,2,3].forEach(i => Array(i).fill(i).forEach(_ => {
something()
}))
or in good old ES5:
[1,2,3].forEach(function(i) {
Array(i).fill(i).forEach(function() {
something()
})
}))
In both cases, the outpout will be
The outpout will be
something
somethin...