仅当存在时如何要求指令（在另一个指令内）

Question

假设我们需要创建两种方法来定义指令的配置：

1 - 使用元素属性

<any main-dir main-name="myname" name-id="may-id" main-other-config="other config"></any>

2- 需要另一个指令

app.directive("mainDirConfig", function () {
  return {
    controller: function (scope){
      scope.config = {
        name: 'my name',
        id: 'my-id',
        otherConfigs: 'other config'
      }
    }
  }
});

<any main-dir main-dir-config></any>

仅当 mainDirConfig 存在时如何在 mainDir 指令中要求 mainDirConfig 指令（作为首选方式），否则使用元素属性作为配置？

更多信息：我想将此配置用于外部模块，我需要将用户配置与模块分开。

Answer 1

来自 angular 文档 here:

需要

Require another directive and inject its controller as the fourth argument to the linking function. The require takes a string name (or array of strings) of the directive(s) to pass in. If an array is used, the injected argument will be an array in corresponding order. If no such directive can be found, or if the directive does not have a controller, then an error is raised. The name can be prefixed with:

(no prefix) - Locate the required controller on the current element. Throw an error if not found.
? - Attempt to locate the required controller or pass null to the link fn if not found.
^ - Locate the required controller by searching the element and its parents. Throw an error if not found.
^^ - Locate the required controller by searching the element's parents. Throw an error if not found.
?^ - Attempt to locate the required controller by searching the element and its parents or pass null to the link fn if not found.
?^^ - Attempt to locate the required controller by searching the element's parents, or pass null to the link fn if not found.

它在指令部分中提到，但仅在 $compile 部分中完全定义。

仅当存在时如何要求指令（在另一个指令内）

how to require a directive (inside another directive) only if exist

javascript

angularjs

angularjs-directive