ui-路由器解析中的嵌套承诺

Question

我已经为以下问题苦苦挣扎了一段时间：

我想在视图显示之前获取一些数据，（解决）。但是有些数据依赖于另一个promise的结果。

它是这样的：我从 $stateParams 获取作业 ID（索引）并在我的服务中查找数据。完成后，根据这个结果（工作），我可以查看设置和楼层（每个都来自不同的服务），两者都是 return 承诺。

到目前为止我想到了什么

jobinfo: function(Jobs, Floor, JobSetting, $stateParams, $q) {

    var defer = $q.defer();

        Jobs.getByIndex($stateParams.index)
        .then(function(job) {
            console.log('got jobs');
            $q.all({floors: Floor.getByJob(job), settings: JobSetting.getByJob(job)})
            .then(function(info) {
                console.log('got info');
                defer.resolve([job, info.floors, info.settings]);
            });
        });

    return defer.promise;
}

取2

jobinfo: function(Jobs, Floor, JobSetting, $stateParams, $q) {

    return Jobs.getByIndex($stateParams.index)
        .then(function(job) {
            console.log('got jobs');
            return $q.all({floors: Floor.getByJob(job), settings: JobSetting.getByJob(job)})
            .then(function(info) {
                console.log('got info');
                return [job, info.floors, info.settings];
            });
        });
}

两者似乎都失败了，我什至没有得到 console.log 回复。

PS：我把剩下的代码留在外面了，显然它们被包裹在

resolve: {
...
}

并在正确的地方定义。

谁能这么温柔地指出我正确的方向？

我最终得到的解决方案如下：（感谢 avcajaraville）

job: function(Jobs, $stateParams) {
    return Jobs.getByIndex($stateParams.index);
},

floors: function(Floor, job) {
    return Floor.getByJob(job);
},

settings: function(JobSetting, job) {
    return JobSetting.getByJob(job);
}

Answer 1

试试这个

jobinfo: function(Jobs, Floor, JobSetting, $stateParams, $q) {

              var defer = $q.defer();

              Jobs.getByIndex($stateParams.index)
                  .then(function(job) {
                      console.log('got jobs');
                      var floors = Floor.getByJob(job);
                      var settings = JobSetting.getByJob(job);
                      $q.all([floors, settings])
                      .then(function(info) {
                          console.log('got info');
                          defer.resolve([job, info[0], info[1]]);
                      });
                  });

              return defer.promise;
          }

Answer 2

我喜欢将解析器分开。

您可以通过这种方式在每个解析器上注入值：

job : function( Jobs, $stateParams, $q ) {
    var defer = $q.defer();
    Jobs.getByIndex( $stateParams.index, function( job ) {
        defer.resolve( job );
    });
    return defer.promise;
},

floor : function( Floor, job, $q ) {
    var defer = $q.defer();
    Floor.getByJob( job, function( floor ) {
        defer.resolve( floor );
    });
    return defer.promise;
},

settings : function( JobSetting, job, $q ) {
    var defer = $q.defer();
    JobSetting.getByJob( job, function( settings ) {
        defer.resolve( settings );
    });
    return defer.promise;
},

来自 ui-router documentation：

The resolve property is a map object. The map object contains key/value pairs of

key – {string}: a name of a dependency to be injected into the controller.

factory - {string|function}:

[...]

if function, then it is injected and the return value is treated as the dependency. If the result is a promise, it is resolved before the controller is instantiated and its value is injected into the controller.

ui-路由器解析中的嵌套承诺

Nested promises in ui-router resolve

angularjs

nested

angular-ui-router

promise

resolve