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AngularJs Learning Part 8 Filter Creation

高洛峰Original: 2017-02-07 14:07:37925browse

demo

This is the entire sample demo

1. filter.js file

angular.module("exampleApp", [])
.constant("productsUrl", "http://localhost:/products")
.controller("defaultCtrl", function ($scope, $http, productsUrl) {
$http.get(productsUrl).success(function (data) {
$scope.products = data;//直接转成了数组
});
});

Here I introduce The service is used as a constant. The advantage of writing it this way is that it is easy for me to modify.

For how to use the $http service, please refer to my AngularJs (3) Deployed using

<!DOCTYPE html>
<html xmlns="http://www.w.org//xhtml" ng-app="exampleApp">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-"/>
<title></title>
<script src="angular.js"></script>
<link href="bootstrap-theme.css" rel="stylesheet" />
<link href="bootstrap.css" rel="stylesheet" />
<script src="filter.js"></script>
</head>
<body ng-controller="defaultCtrl" >
<div class="panel">
<div class="panel-heading">
<h class="btn btn-primary">Products</h>
</div>
<div class="panel-body">
<table class="table table-striped table-condensed">
<thead>
<tr>
<td>Name</td><td>Category</td><td>Price</td><td>expiry</td>
</tr>
</thead>
<tbody>
<tr ng-repeat="item in products">
<td>{{item.name | uppercase}}</td>
<td>{{item.category}}</td>
<td>{{item.price | currency}}</td>
<td>{{item.expiry| number }}</td>
<td>{{item | json}}</td>
</tr>
</tbody>
</table>
</div>
</div>
</body>
</html>

Running results:

AngularJs学习第八篇过滤器filter创建

Use filter

Filters are divided into two categories:

1. Filtering of single data

2. Operate the collection.

1. It is relatively simple to operate the data. As shown in the demo, you can format it in {{item | currency}}, etc.

Currency: "f" can filter the price into pounds.

Filter for single data. For the data format you want to filter, use : in the corresponding format character after the filter.

Number: Indicates the reserved decimal places of the data,

2: Set filtering, filter out a certain number from the set.

In the basic demo, I added this:

<div class="panel-heading">
<h class="btn btn-primary">Products</h>
</div>
<div class="panel-body">
Limit:<select ng-model="limitValue" ng-options="p for p in limitRange" ></select>
</div>
　　filter.js中加入了：
$http.get(productsUrl).success(function (data) {
$scope.products = data;//直接转成了数组
$scope.limitValue = "";//要是字符串
<span style="background-color: rgb(, , );"> $scope.limitRange = [];
for (var i = ; i <= $scope.products.length; i++) {
$scope.limitRange.push(i.toString());
<span style="background-color: rgb(, , );"> }</span></span>
});
　<tr ng-repeat="item in products|limitTo:limitValue">
<td>{{item.name | uppercase}}</td>
<td>{{item.category}}</td>
<td>{{item.price | currency}}</td>
<td>{{item.expiry| number }}</td>
<td>{{item | json}}</td>
</tr> 　　
<span style="line-height: .; font-family: verdana, Arial, Helvetica, sans-serif; font-size: px; background-color: rgb(, , );">　</span>

The function you are writing must be written in success because json is obtained asynchronously data.

Result:

AngularJs学习第八篇过滤器filter创建

limit: You can adjust the number displayed on the page.

Create filter

AngularJs has two types of filters. First, we can create a filter that formats individual data, for example: the first letter of the output string is capitalized.

Let’s first talk about how to define a filter: The filter is created through module.filter. The general format of creation is:

angular.module("exampleApp") //Indicates getting a module. Filters are created under modules.

.filter("labelCase", function () { //Receive two parameters, the first parameter represents the name of the filter, and the second is a factory function

return function (value, reverse) { //Return a worker function, corresponding to the corresponding filtering process. The first parameter indicates the object that needs to be formatted, and the second parameter indicates the configuration and the format.

if(angular.isString(value))
{
var intermediate = reverse ? value.toUpperCase() : value.toLowerCase();
return (reverse ? intermediate[].toLowerCase() : intermediate[].toUpperCase() + intermediate.substr());
}else
{
return value;
}
}
});

##I wrote this into a js file. CustomFilter.js Don’t forget to add it. Now let me change the data:

<link href="bootstrap.css" rel="stylesheet" />
<script src="filter.js"></script>
<script src="customFilter.js"></script>

As mentioned before, if you need to add configuration information, the writing format is filter: option

Of course, the default parameters are also If you don’t write it, it will default to Null value or undefined.

Result:

It’s that simple to customize a filter function for each data processing.

#2. Customize a collection processing function, just like limitTo

<td>{{item.name | labelCase:true}}</td>

## html changed part:

angular.module("exampleApp")
.filter("labelCase", function () {
return function (value, reverse) {
if (angular.isString(value)) {
var intermediate = reverse ? value.toUpperCase() : value.toLowerCase();
return (reverse ? intermediate[].toLowerCase() : intermediate[].toUpperCase() + intermediate.substr());
} else {
return value;
}
}
})
.filter("skip", function () {
return function(data,count)
{
if (angular.isArray(data) && angular.isNumber(count)) {
if(data.length<count || count<)
{
return data;
}else
{
return data.slice(count);
}
} else {
return data;
}
}
});

Result: There are six pieces of data in total, and the skip filter was used to pass 2 pieces

. When customizing the filter, I found that a filter has already been defined. I don’t want to define it again. What should I do? We can also create it using the previously created filter.

$filter('skip') calls the skip filter, because it returns a function, so we can continue to pass parameters AngularJs学习第八篇过滤器filter创建

<tr ng-repeat="item in products | skip: ">

Result:

##The filter is completed like this. Isn’t it very simple?

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