How to use angularjs filter? Introduction to how to use angularjs filter

This article mainly talks about the detailed explanation of how to use angularjs filters, and there are more formatting styles of angularjs filters. Next, let us read this article together.

Let’s first talk about the use of angularjs filters:

AnularJS filter is used to format the data that needs to be displayed to the user. There are many useful built-in filters, or you can write your own.

Call the filter through the | symbol within the template binding symbol {{ }} in HTML. For example, suppose we want to convert the string

to uppercase. We can convert each character in the string individually, or we can use the filter:

{{ name | uppercase }}

in JavaScript code Filters can be called via $filter. For example, when using a lowercase filter in JavaScript code:

app.controller('DemoController', ['$scope', '$filter',
function($scope, $filter) {
$scope.name = $filter('lowercase')('Ari');
}]);

When using a filter in the form of HTML, if you need to pass parameters to the filter, just add a colon

after the filter name. Can. If there are multiple parameters, you can add a colon after each parameter. For example, a numeric filter can limit the number of digits after the decimal point

. Write: 2 after the filter to pass 2 as a parameter to the filter:

<!-- 显示：123.46 -->
{{ 123.456789 | number:2 }}

1.currency

The currency filter can format a numerical value into currency format. Use {{ 123 | currency }} to convert

#123 into currency format.

The currency filter allows us to set the currency symbol ourselves. By default, the currency symbol of the region where the client is located will be used,

, but the currency symbol can also be customized. (If you want to see more, go to the AngularJS Learning Manual column on the PHP Chinese website)

2.date

date filter can change the date format into the required format. There are several date formats built into AngularJS. If no format is specified, the mediumDate format will be used by default. This format is shown in the example below.

The following are the built-in date formats that support localization:

{{ today | date:'medium' }}

• ##{{ today | date:'short' }}

• {{ today | date:'fullDate' }}

• {{ today | date:'longDate' }}

• {{ today | date:'mediumDate' } }

• {{ today | date:'shortDate' }}
• # #{{ today | date:'shortTime' }}

• ##Year Format

Four-digit year: {{ today | date:'yyyy' }}

Two-digit year: {{ today | date:'yy' }} One-digit year: {{ today | date:'y' }}

Month format

English month: {{ today | date:'MMMM' }}

English month abbreviation: {{ today | date: 'MMM' }} Number month: {{ today |date:'MM' }}

The month of the year: {{ today |date:'M' }}

Date formatting

Number date: {{ today|date:'dd' }}

Day of the month: {{ today | date:'d' } } English week: {{ today | date:'EEEE' }}

English abbreviation of week ：{{ today | date:'EEE' }}

Hour format

24-hour digital hour: { {today|date:'HH'}}

Hour of the day: {{today|date:'H'}} 12-hour digital hour: {{today|date:'hh'}}

What is the morning or afternoon number? Hours: {{today|date:'h'}}

Minute format

Numeric minutes: { { today | date:'mm' }}

The minute of the hour: {{ today | date:'m' }}

Seconds format

Numeric seconds: {{ today | date:'ss' }} The number of milliseconds: {{ today | date:'.sss' }}

Here are some examples of custom date formats:

{{ today | date:&#39;MMMd, y&#39; }} <!-- Aug9, 2013 -->
{{ today | date:&#39;EEEE, d, M&#39; }} <!-- Thursday, 9, 8-->
{{ today | date:&#39;hh:mm:ss.sss&#39; }} <!-- 12:09:02.995 -->

filter The operator selects a subset from a given array and returns it as a new array.

例如，用下面的过滤器可以选择所有包含字母e的单词：

{{ ['Ari','Lerner','Likes','To','Eat','Pizza'] | filter:'e' }}
<!-- ["Lerner","Likes","Eat"] -->

如果要过滤对象，可以使用上面提到的对象过滤器。例如，如果有一个由people对象组成的

数组，每个对象都含有他们最喜欢吃的食物的列表，那么可以用下面的形式进行过滤：

{{ [{
'name': 'Ari',
'City': 'San Francisco',
'favorite food': 'Pizza'
},{
'name': 'Nate',
'City': 'San Francisco',
'favorite food': 'indian food'
}] | filter:{'favorite food': 'Pizza'} }}
<!-- [{"name":"Ari","City":"SanFrancisco","favoritefood":"Pizza"}] -->

也可以用自定义函数进行过滤（在这个例子中函数定义在$scope上）：

{{ ['Ari','likes','to','travel'] | filter:isCapitalized }}
<!-- ["Ari"] -->

isCapitalized函数的功能是根据首字母是否为大写返回true或false，具体如下所示：

$scope.isCapitalized = function(str) {
return str[0] == str[0].toUpperCase();
};

自定义过滤器

首先，创建一个模块用以在应用中进行引用

angular.module('myApp.filters', [])
.filter('capitalize', function() {
return function(input) {
// input是我们传入的字符串
if (input) {
return input[0].toUpperCase() + input.slice(1);
}
});

现在，如果想将一个句子的首字母转换成大写形式，可以用过滤器先将整个句子都转换成小

写，再把首字母转换成大写：

<!-- Ginger loves dog treats -->
{{ &#39;ginger loves dog treats&#39; | lowercase | capitalize }}

以上就是AngularJS过滤器的使用方法（想看更多就到PHP中文网，AngularJS使用手册栏目学习），有问题的可以在下方提问。

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