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APP INVENTOR硬件交互学习教程09——增加人机交互提示 · App Inventor 2 中文网
...未连接蓝牙时逻辑处理
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demo_09.aia 源码下载
您的改进建议 联系方式： 不需要回复的可留空~ 意见反馈（300字以内）： 给个鼓励也行呐~o~ ...
APP INVENTOR硬件交互学习教程10——多个虚拟界面实现 · App Inventor 2 中文网
...，用来处理界面的切换
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demo_10.aia 源码下载
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APP INVENTOR硬件交互学习教程11——滑动条控制舵机 · App Inventor 2 中文网
...示和发送指令给下位机
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demo_11.aia 源码下载
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How to use npm with node.exe?
...dules I've made the most use of are as follows.
axios - for more complex http posts/gets
isomorphic-fetch - for http(s) post/get requests
node-mailer - smtp client
mssql - interface and driver library for querying MS SQL Server (wraps tedious)
More advanced JS options...
async/await - async fu...
Akka Kill vs. Stop vs. Poison Pill?
...Also see the 'Stopping an Actor', 'Killing an Actor' section in the docs:
http://doc.akka.io/docs/akka/snapshot/scala/actors.html
And more on supervision strategies:
http://doc.akka.io/docs/akka/snapshot/scala/fault-tolerance.html
...
How do I set up email confirmation with Devise?
... server in development, catching all incoming mails and displaying them on http://localhost:1080/:
gem install mailcatcher
Once installed start the mailcatcher server with the command:
mailcatcher
A toy SMTP server will be running on port 1025 catching emails and displaing them on HTTP port 10...
How to create a unique index on a NULL column?
...pose of uniques.
However, this person seems to have a decent work around:
http://sqlservercodebook.blogspot.com/2008/04/multiple-null-values-in-unique-index-in.html
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...
File upload progress bar with jQuery
...ith jQuery only:
$.ajax({
xhr: function() {
var xhr = new window.XMLHttpRequest();
xhr.upload.addEventListener("progress", function(evt) {
if (evt.lengthComputable) {
var percentComplete = evt.loaded / evt.total;
percentComplete = parseInt(percentComplete * 100);
...
How to add custom validation to an AngularJS form?
...fy a function to call to do the validation.
Have a look at the demo page: http://angular-ui.github.com/, search down to the Validate heading.
From the demo page:
<input ng-model="email" ui-validate='{blacklist : notBlackListed}'>
<span ng-show='form.email.$error.blacklist'>This e-mail...
What's the false operator in C# good for?
...p; when you write || and &&.
For example, look at this code (from http://ayende.com/blog/1574/nhibernate-criteria-api-operator-overloading - where I found out about this trick; archived version by @BiggsTRC):
public static AbstractCriterion operator &(AbstractCriterion lhs, AbstractCri...