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Get file size, image width and height before upload
...entById('preview');
const readImage = file => {
if ( !(/^image\/(png|jpe?g|gif)$/).test(file.type) )
return EL_preview.insertAdjacentHTML('beforeend', `Unsupported format ${file.type}: ${file.name}<br>`);
const img = new Image();
img.addEventListener('load', () => {
...
Linux日志管理Rsyslog入门 - C/C++ - 清泛网移动版 - 专注C/C++及内核技术
...
# See rsyslogd(8) for more details
SYSLOGD_OPTIONS="-d -n"
如果你想测试Rsyslog是否工作的话，可以通过系统内建的logger命令发消息；如果你想测试Rsyslog性能如何的话，可以考虑使用官方提供的tcpflood。
实例演示
在我们动手之前，有必要...
动态组件使用指导 · App Inventor 2 中文网
...生成一排按钮
用模板一次创建一张卡片
搭建与测试
属性、方法与事件速查
常见问题与验收
完整 .aia 源码与操作指导
巡检表单与设备资料卡
先运行这个实际案例
不...
UIBarButtonItem with custom image and no border
...
I found it this ways easy. It is sugested on top. "random.png" has to be in project. Just drag and drop any image.
UIButton *a1 = [UIButton buttonWithType:UIButtonTypeCustom];
[a1 setFrame:CGRectMake(0.0f, 0.0f, 25.0f, 25.0f)];
[a1 addTarget:self action:@selector(r...
Changing the background drawable of the searchview widget
...d through nine-patches, so we'll do it the same way. You can find original png images in drawable-mdpi directory of Android git repository. We're interested in two image. One for state when text field is selected (named textfield_search_selected_holo_light.9.png) and one for where it's not (named te...
使用App Inventor扩展实现多点触控：Scale Detector · App Inventor 2 中文网
...未合并到 App Inventor 版本中。 但是你可以使用我们的扩展测试服务器尝试下面描述的一些步骤：
演示打包的应用程序 ScaleGestureDemo.apk 可以像任何 apk 文件一样加载和运行。
你可以按照下面的第 1 部分加载提供的源文件 ScaleG...
How to set HTTP headers (for cache-control)?
... the contents in the cache.
Use:
<FilesMatch "\.(ico|pdf|flv|jpg|jpeg|png|gif|js|css|swf)$">
Header set Cache-Control "max-age=604800, public"
</FilesMatch>
Where: 604800 = 7 days
PS: This can be used to reset any header
...
Google Maps API 3 - Custom marker color for default (dot) marker
...n e.g.
marker.setIcon('http://maps.google.com/mapfiles/ms/icons/green-dot.png')
Or as part of marker init:
marker = new google.maps.Marker({
icon: 'http://...'
});
Other colours:
Blue marker
Red marker
Purple marker
Yellow marker
Green marker
Use the following piece of code to update d...
How to use 'cp' command to exclude a specific directory?
...mages/*
images/004.bmp images/033.jpg images/1276338351183.jpg images/2252.png
$ echo images/!(*.jpg)
images/004.bmp images/2252.png
So you just put a pattern inside !(), and it negates the match. The pattern can be arbitrarily complex, starting from enumeration of individual paths (as Vanwaril sho...
CSS background opacity with rgba not working in IE 8
...
Create a png which is larger than 1x1 pixel (thanks thirtydot), and which matches the transparency of your background.
EDIT : to fall back for IE6+ support, you can specify bkgd chunk for the png, this is a color which will replace t...