如何从浏览器控制台访问和测试AngularJS过滤器?

问题描述

给出一个测试过滤器，说出大写"过滤器将大写每个单词的第一个字母:

return function (input) {
  return (!!input) ? input.replace(/([^\W_]+[^\s-]*) */g, function (txt) {
    return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();
  }) : '';
}

如何从浏览器的JavaScript控制台测试此过滤器?

解决方案

可以在HTML模板绑定{{myString |大写}}，但是要在浏览器中访问它，我们有一个不错的选择.考虑一下:

$filter('filter')(array, expression, comparator)每个角度$ filter文档

可以通过$filter服务调用实现过滤器，因此您可以通过以下方式访问，调用和测试capitalize过滤器:

angular.element(document.body).injector().get('$filter')('capitalize')('capitalization test')

控制台中的结果? "Capitalization Test"

具有多个输入的过滤器怎么样?只需添加参数，例如，如果capitalize过滤器具有第二个布尔参数以将大写字母限制为仅第一个单词，则将其大写:

angular.element(document.body).injector().get('$filter')('capitalize')('capitalization test', true)

OR

angular.element(document.body).injector().get('$filter')('capitalize').apply(null, ['capitalization test', true])

对于此SO文章和相关博客条目的荣誉，以便从控制台发布有关访问服务的信息:.

Given a test filter, say this 'capitalize' filter that will capitalize the first letter of each word:

return function (input) {
  return (!!input) ? input.replace(/([^\W_]+[^\s-]*) */g, function (txt) {
    return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();
  }) : '';
}

How can this filter be tested from a browser's JavaScript console?

解决方案

Filters can be called in HTML template binding {{myString | capitalize}}, but to gain access to it in the browser we have an excellent option. Consider this:

$filter('filter')(array, expression, comparator) per Angular $filter documentation

Realizing a filter can be called via the$filter service, you can thus access, call and test the capitalize filter this way:

angular.element(document.body).injector().get('$filter')('capitalize')('capitalization test')

The result in the console? "Capitalization Test"

What about a filter with more than one input? Just add the parameter, for instance if the capitalize filter had a second boolean parameter to restrict capitalization to the first word only:

angular.element(document.body).injector().get('$filter')('capitalize')('capitalization test', true)

OR

angular.element(document.body).injector().get('$filter')('capitalize').apply(null, ['capitalization test', true])

Kudos to this SO article and related blog entries for posting on accessing services from the console: access service from console.

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