在服务中使用 $timeout:this.func 不是函数 [英] Using $timeout in service: this.func is not a function

问题描述

我一直在尝试使用 promise 在一定时间后结束用户会话.

问题是，每当从 $timeout 触发的函数中调用 service 中定义的函数时，该函数似乎是未定义的.我认为这是某种范围问题，但我无法自行解决此问题.

app.service('sessionService', function($timeout) {var closeSession = function() {this.resetUserInfo()//也许也可以做其他事情}this.start = function() {console.log("开始")承诺 = $timeout(closeSession, sessionLength)}this.resetUserInfo = function() {//重置会话}}

<块引用>

错误:this.resetUserInfo 不是函数

我尝试过的东西

• 不同的功能顺序
• this.closeSession 而不是 var
• $timeout(function(){closeSession(this.resetUserInfo)}, sessionLength) 适当修改 closeSession

解决方案

注意这个分配给那个.所以你使用的是服务的作用域，而不是方法的作用域.

 app.service('sessionService', function($timeout) {var that = this;var closeSession = function() {that.resetUserInfo()//也许也可以做其他事情}this.start = function() {console.log("开始")承诺 = $timeout(closeSession, sessionLength)}this.resetUserInfo = function() {//重置会话}}

I've been trying to use promise to end user session after certain amount of time.

Problem is, whenever a function defined in service is called from the function triggered by $timeout, the function seems to be undefined. I think it's some kind of a scope issue, but I have not managed to fix this on my own.

app.service('sessionService', function($timeout) {
    var closeSession = function() {
        this.resetUserInfo()
        // maybe do other things as well
    }

    this.start = function() {
         console.log("start")
         promise = $timeout(closeSession, sessionLength)
    }

    this.resetUserInfo = function() {
        // reset session
    }
} 

Error: this.resetUserInfo is not a function

Things I have tried

• different ordering of functions
• this.closeSession instead of var
• $timeout(function(){closeSession(this.resetUserInfo)}, sessionLength) with proper modifications to closeSession

解决方案

Note this assigned to that. So you are using the scope of the service instead of the scope of the method.

 app.service('sessionService', function($timeout) {
    var that = this;
    var closeSession = function() {
        that.resetUserInfo()
        // maybe do other things as well
    }

    this.start = function() {
         console.log("start")
         promise = $timeout(closeSession, sessionLength)
    }

    this.resetUserInfo = function() {
        // reset session
    }
} 

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