角度精确过滤器 [英] exact filter in angular
本文介绍了角度精确过滤器的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在 Angular 中，有没有办法修改过滤器，使其只返回完全匹配的结果?
In Angular, is there a way to modify the filter such that it only returns exact matches?
示例:
var words = [
{ title: "ball" },
{ title: "wall" },
{ title: "all" },
{ title: "alloy" }
];
var wordsFiltered = filter('filter')
(
words,
{
'title': 'all'
}
);
以上将匹配 'ball'、'wall'、'all' 和 'alloy'.但我希望它只匹配全部".有什么办法可以改变吗?
The above will match 'ball', 'wall', 'all' and 'alloy'. But I would like it to only match 'all'. Any way to change it?
推荐答案
UPDATE
从 AngularJS v.1.1.3 开始，精确的过滤是 原生提供:
Find words that exactly match title:
<input ng-model="match.title" />
<br>
and exactly match type:
<input ng-model="match.type" />
<hr>
<table>
<tr ng-repeat="word in words | filter:match:true">
<td>{{word.title}}</td>
</tr>
</table>
您的问题暗示您希望匹配多个对象属性，因此这里有一个过滤器:
Your question implies that you would want to match against multiple object properties so here's a filter that does that:
app.controller('AppController',
[
'$scope',
function($scope) {
$scope.match = {};
$scope.words = [
{ title: "ball", type: 'object' },
{ title: "wall", type: 'object' },
{ title: "all", type: 'word' },
{ title: "alloy", type: 'material' }
];
}
]
);
app.filter('exact', function(){
return function(items, match){
var matching = [], matches, falsely = true;
// Return the items unchanged if all filtering attributes are falsy
angular.forEach(match, function(value, key){
falsely = falsely && !value;
});
if(falsely){
return items;
}
angular.forEach(items, function(item){ // e.g. { title: "ball" }
matches = true;
angular.forEach(match, function(value, key){ // e.g. 'all', 'title'
if(!!value){ // do not compare if value is empty
matches = matches && (item[key] === value);
}
});
if(matches){
matching.push(item);
}
});
return matching;
}
});
<body ng-controller="AppController">
Find words that exactly match title:
<input ng-model="match.title" />
<br>
and exactly match type:
<input ng-model="match.type" />
<hr>
<table>
<tr ng-repeat="word in words | exact:match">
<td>{{word.title}}</td>
</tr>
</table>
</body>
这篇关于角度精确过滤器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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