Keep Walking

2017年5月8日星期一

顯示部分字的方法 rails

<%= post.content[0,20] %>
最簡單，但html tag也會跑出來

Rails3之後已經預設不讓html tag逸出

解釋一下下面這個
raw是讓content逸出，但會對網站造成風險
strip_tags 移除html標籤
truncate 擷取前幾個字元
<%= truncate(strip_tags(raw(post.content)),:length=>200) %>

或是直接使用白名單sanitize

<%= sanitize( @event.description ) %>

參考資料
https://ihower.tw/rails/actionview-helpers.html#sec4

https://apidock.com/ruby/Curses/raw/class

http://stackoverflow.com/questions/10129408/show-only-some-words-from-post-as-preview

https://ruby-china.org/topics/6539

https://ruby-china.org/topics/599

bootstrap v3 v4 改版差異

改版差異，沒事改這個幹麼....

grid sytem

v3

.col-md-6 .col-md-offset-3

v4

.col-md-6 .offset-md-3

Shit!!It cost my 30 mins to debug this small change.

2017年5月6日星期六

Vue Js進度

2017年5月4日星期四

Rancher requests.exceptions.ConnectionError: HTTPConnectionPool(host='localhost', port=8080): Max retries exceeded with url: /v1 (Caused by NewConnectionError(': Failed to establish a new connection: [Errno 111] Connection refused',))

教學文章
https://blog.hellosanta.com.tw/%E7%B6%B2%E7%AB%99%E8%A8%AD%E8%A8%88/%E4%BC%BA%E6%9C%8D%E5%99%A8/%E8%A6%96%E8%A6%BA%E5%8C%96%E7%AE%A1%E7%90%86%E7%9C%BE%E5%A4%9A-docker-%E5%AE%B9%E5%99%A8%E8%88%87%E9%83%A8%E7%BD%B2%E7%9A%84%E5%A5%BD%E5%B7%A5%E5%85%B7%EF%BC%9Arancher

http://columns.chicken-house.net/2016/04/29/rancher-on-azure-lab/

Ubuntu16.04

I try to addhost in Rancher,but get this error

requests.exceptions.ConnectionError: HTTPConnectionPool(host='localhost', port=8080): Max retries exceeded with url: /v1 (Caused by NewConnectionError('<requests.packages.urllib3.connection.HTTPConnection object at 0x7f5b3588b810>: Failed to establish a new connection: [Errno 111] Connection refused',))

because the

Host Registration URL

I use the http://localhost:8080 orginally

and the Rancher got find the top IP 192.168.1.109:8080

after that I modify the IP 192.168.1.109:8080

just leave the 4th column blank is fine.
copy and paste to the terminal

official github
https://github.com/rancher/rancher/issues/1151

2017年4月28日星期五

.bundle/cache/compact_index/rubygems.org error

I got this in few months, and can't find the solution.
after all, I found it. Just clean the cache.

http://stackoverflow.com/questions/41472374/bundle-install-fails-permission-denied-rb-sysopen

rm -rf ~/.bundle/cache

There was an error while trying to write to
`/home/xxx/.bundle/cache/compact_index/rubygems.org.443.29b0360b937aa4d161703e6160654e47/versions`. It is likely that you need to
grant write permissions for that path.

2017年4月27日星期四

cs50 2016

week4
NodeList

datastructure
stack
queue

compressor

hashing table

week2
initilaize
int main(int argc, string argv[])
$ ./initials ccc => argc ==2;
$ ./initials ccc => argv[1]==ccc;

//這個卡了我三個小時
if(s[i] == '\0') <--一直想這樣弄結果卡在這
if(s[i] == ' ')
{
i++;
printf("%c", toupper(s[i]));
}

http://imil.au.edu.tw/~hsichcl/TurboC/C_Unit10.htm
http://programming.im.ncnu.edu.tw/Chapter10.htm

caesar 終於卡沒那麼那麼久了放煙火
printf("%c\n", plaintext[i]);

#include <stdio.h>
#include <cs50.h>
#include <string.h>
#include <ctype.h>

int main(int argc, string argv[])
{
    if (argc == 2)
    {
    string plaintext = get_string();
    int key = atoi(argv[1]);
    // printf("plaintext:");
    // printf("%s\n",plaintext);
        for(int i = 0, n = strlen(plaintext); i < n; i++)
        {
            if(isalpha(plaintext[i]))
            {
                if(isupper(plaintext[i]))
                {
                    int upc = (plaintext[i] + key - 65) % 26 + 65;
                    printf("%c", upc);
                }else
                {
                    int lpc = (plaintext[i] + key - 97) % 26 + 97;
                    printf("%c", lpc);
                }
            }else{
                printf("%c", plaintext[i]);
            }
        }
    }
    printf("\n");
}

2017年4月22日星期六

JS30

D15
localStorage

D14
    array reference, not an array copy when use
    const players = ['Wes', 'Sarah', 'Ryan', 'Poppy'];

    // and we want to make a copy of it.
    const team = players;
JSON-is-not-Javascript-Object
http://www.fizerkhan.com/blog/posts/JSON-is-not-Javascript-Object.html

D13
滾動超過圖片一半會跑出來

D12
addEventListener的運用('keyup',(e) =>{})

D11
這句話讓我見識到chrome的強大
webkitEnterFullScreen();

D10
with shift key

D9
console.* 教學

D8
console.xxx教學

D7
canvas 畫板，很酷

D6
Ajax search
.fetch

D5
漂亮的夾頁

D4
javascript function練習

D3
圖片CSS漸變

D2
css
transform-origin: 100%;
transform: rotate(90deg);
transition: all 0.05s;
transition-timing-function: cubic-bezier(0.1, 2.7, 0.58, 1);

const seconds = now.getSeconds();
const secondsDegrees = ((seconds / 60) * 360 + 90);
secondsHand.style.transform = `rotate(${secondsDegrees}deg)`;

Methods setInterval

D1
Nodelist
http://www.w3school.com.cn/xmldom/dom_nodelist.asp

keys.forEach(key => key.addEventListener('transitionend', removeTransition));

2017年5月8日 星期一