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Are strongly-typed functions as parameters possible in TypeScript?
...ar foo = new Foo();
var strCallback = (result: string) : void => {
alert(result);
}
var numCallback = (result: number) : void => {
alert(result.toString());
}
foo.save(strCallback); // not OK
foo.save(numCallback); // OK
If you want, you can define a type alias to encapsulate this:...
How to allow to accept only image files?
...
Steps:
1. Add accept attribute to input tag
2. Validate with javascript
3. Add server side validation to verify if the content is really an expected file type
For HTML and javascript:
<html>
<body>
<input name="image" type="file" id="fileName" accept=".jpg,.jpeg,.png" onc...
Accessing JPEG EXIF rotation data in JavaScript on the client side
...e data. The trick is that all this should happen in the browser, using JavaScript and <canvas> .
8 Answers
...
How to use Checkbox inside Select Option
... element but you can get the same functionality by using HTML, CSS and JavaScript. Here is a possible working solution. The explanation follows.
Code:
var expanded = false;
function showCheckboxes() {
var checkboxes = document.getElementById("checkboxes");
if (!expanded) {
ch...
TaifunWiFi 拓展：WiFi Manager WiFi管理器扩展 · App Inventor 2 中文网
...
TaifunWiFi 拓展：WiFi Manager WiFi管理器扩展
开发动机
功能概述
扩展截图
属性
方法
事件
使用示例
基本WiFi状态检查
扫描可用网络
连接到WiFi网络
获取网络详细信息
错...
How do you use $sce.trustAsHtml(string) to replicate ng-bind-html-unsafe in Angular 1.2+
...his with a value returned by a function? <p ng-bind-html="">{{description(category.id)}}</p>
– dasper
Sep 20 '13 at 7:00
...
How to impose maxlength on textArea in HTML using JavaScript
... is: either FF or IE (I think it's FF) returns a different string when Javascript checks the "value" attribute than what it sends back to the server when the form is posted! It has something to do with how hard line breaks do/don't get a carriage return character inserted. It's easy to figure out wi...
将Linux代码移植到Windows的简单方法 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...ows平台上面安装上Cygwin的最新版本，在Cygwin中安装好GCC等开发工具。 同样也需要一个Windows开发环境。可以使用最新版本Visual Studio, Microsoft Visual Studio .NET 2003。从www.gnu.org上取得Tar的最新源代码，版本是1.13。在Cygwin下面解开tar-1.1...
Detect the Enter key in a text input field
... @jQuerybeast It's not needed, and event.keyCode is a Number, so JavaScript will take the same steps with == or ===.
– alex
Aug 15 '11 at 1:47
7
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【App Inventor 2 数据可视化】使用柱状图和饼图收集数据 - App应用开发 - ...
...备AI伴侣版本号在 2.65 以上）（iOS 电子表格功能目前正在开发中）。没有电子设备?要在计算机上使用模拟器，请检查[安装说明]。
你能做什么?：挑战：把你的数据做成图表为什么要开发一个收集数据的应用程序?哪种图表最能...