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迷你MVVM框架 avalonjs 学习教程16、过滤器

时间:2014-10-11 13:05:25      阅读:307      评论:0      收藏:0      [点我收藏+]

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avalon的过滤器是参考自angularrivets。它也被称做管道文本过滤器,它的处理对象只能是文本(字符串),它只能用在文本绑定中,并且只能是双花括号形式。下面是各大家的过滤器比较:

rivetsjs

<span rv-text="event.startDate | date"></span>
<input rv-value="item.price | currency">
<span rv-text="billing.cardNumber | mask 4 4 ********"></span>

angularjs

<b>{{ "lower cap string" | uppercase }}</b>
<span>{{ {foo: "bar", baz: 23} | json }}</span>
{{ 1304375948024 | date }}
{{ 1304375948024 | date:"MM/dd/yyyy @ h:mma" }}
{{ expression | filter1 | filter2 | ... }}

avalon.js

{{aaa | uppercase }}
{{12345| number}}
<div>{{ prop | filter1 | filter2 | filter3(args, args2) | filter4(args)}}</div>
生成于{{ 1373021259229 | date("yyyy MM dd:HH:mm:ss")}}

avalon的传参是通过小括号实现,多个参数用逗号隔开,这与JS的方法调用相似,力求减少学习成本。

avalon自带以下几个过滤器

html
没有传参,用于将文本绑定转换为HTML绑定
uppercase
大写化
lowercase
小写化
truncate
对长字符串进行截短,truncate(number, truncation), number默认为30,truncation为“…”
camelize
驼峰化处理
escape
对类似于HTML格式的字符串进行转义,把尖括号转换为> <
currency
对数字添加货币符号,以及千位符, currency(symbol)
number
对数字进行各种格式化,这与与PHP的number_format完全兼容, 它有三个参数。decimals 可选,规定多少个小数位。dec_point可选,规定用作小数点的字符串(默认为 . )。 thousands_sep可选,规定用作千位分隔符的字符串(默认为 , ),如果设置了该参数,那么所有其他参数都是必需的。
date
对日期进行格式化,date(formats)

  ‘yyyy‘: 4 digit representation of year (e.g. AD 1 => 0001, AD 2010 => 2010)
  ‘yy‘: 2 digit representation of year, padded (00-99). (e.g. AD 2001 => 01, AD 2010 => 10)
  ‘y‘: 1 digit representation of year, e.g. (AD 1 => 1, AD 199 => 199)
  ‘MMMM‘: Month in year (January-December)
  ‘MMM‘: Month in year (Jan-Dec)
  ‘MM‘: Month in year, padded (01-12)
  ‘M‘: Month in year (1-12)
  ‘dd‘: Day in month, padded (01-31)
  ‘d‘: Day in month (1-31)
  ‘EEEE‘: Day in Week,(Sunday-Saturday)
  ‘EEE‘: Day in Week, (Sun-Sat)
  ‘HH‘: Hour in day, padded (00-23)
  ‘H‘: Hour in day (0-23)
  ‘hh‘: Hour in am/pm, padded (01-12)
  ‘h‘: Hour in am/pm, (1-12)
  ‘mm‘: Minute in hour, padded (00-59)
  ‘m‘: Minute in hour (0-59)
  ‘ss‘: Second in minute, padded (00-59)
  ‘s‘: Second in minute (0-59)
  ‘a‘: am/pm marker
  ‘Z‘: 4 digit (+sign) representation of the timezone offset (-1200-+1200)
  format string can also be one of the following predefined localizable formats:

  ‘medium‘: equivalent to ‘MMM d, y h:mm:ss a‘ for en_US locale (e.g. Sep 3, 2010 12:05:08 pm)
  ‘short‘: equivalent to ‘M/d/yy h:mm a‘ for en_US locale (e.g. 9/3/10 12:05 pm)
  ‘fullDate‘: equivalent to ‘EEEE, MMMM d,y‘ for en_US locale (e.g. Friday, September 3, 2010)
  ‘longDate‘: equivalent to ‘MMMM d, y‘ for en_US locale (e.g. September 3, 2010
  ‘mediumDate‘: equivalent to ‘MMM d, y‘ for en_US locale (e.g. Sep 3, 2010)
  ‘shortDate‘: equivalent to ‘M/d/yy‘ for en_US locale (e.g. 9/3/10)
  ‘mediumTime‘: equivalent to ‘h:mm:ss a‘ for en_US locale (e.g. 12:05:08 pm)
  ‘shortTime‘: equivalent to ‘h:mm a‘ for en_US locale (e.g. 12:05 pm)

例子:

<!DOCTYPE html>
<html>
    <head>
        <title>filter</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width">
        <script src="avalon.js"></script>
        <script>
            avalon.define({
                $id: "test"
            })
        </script>
    </head>
    <body ms-controller="test">
        <p>生成于{{new Date | date("yyyy MM dd:HH:mm:ss")}}</p>
        <p>生成于{{ "2011/07/08" | date("yyyy MM dd:HH:mm:ss")}}</p>
        <p>生成于{{ "2011-07-08" | date("yyyy MM dd:HH:mm:ss")}}</p>
        <p>生成于{{ "01-01-2000" | date("yyyy MM dd:HH:mm:ss")}}</p>
        <p>生成于{{ "03 04,2000" | date("yyyy MM dd:HH:mm:ss")}}</p>
        <p>生成于{{ "3 4,2000" | date("yyyy MM dd:HH:mm:ss")}}</p>
        <p>生成于{{ 1373021259229 | date("yyyy MM dd:HH:mm:ss")}}</p>
        <p>生成于{{ "1373021259229" | date("yyyy MM dd:HH:mm:ss")}}</p>
        <p>值得注意的是,new Date可传的格式类型非常多,但不是所有浏览器都支持这么多,
            详看<a href="http://dygraphs.com/date-formats.html">这里</a></p>
    </body>
</html>

bubuko.com,布布扣

如果想自定义过滤器,可以这样做:

    

   avalon.filters.myfilter = function(str, args, args2){//str为管道符之前计算得到的结果,默认框架会帮你传入,此方法必须返回一个值
          /* 具体逻辑 */
          return ret;
       }

如果想格式化表单控件的值,请使用$watch回调。

迷你MVVM框架 avalonjs 学习教程16、过滤器

标签:des   http   io   使用   ar   java   for   strong   sp   

原文地址:http://www.cnblogs.com/rubylouvre/p/4018538.html

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