问题 "Uncaught (in promise) TypeError" Angular 中的 RiveScript 聊天机器人

Question

我正在尝试在 Angular 中实现基于 RiveScript 的聊天机器人。聊天机器人工作得很好——我总是在控制台中得到正确的答案。显示用户的输入也很有效。但是，我总是卡在某一点：由于以下错误，在聊天中显示聊天机器人的答案 UI：

ERROR Error: Uncaught (in promise): TypeError: this is undefined

我真的试了很多东西，就是找不到问题所在。从我的角度来看，这也有点令人困惑，因为我可以在控制台中获得正确的聊天机器人消息。如果有人能帮我解决这个问题，我会很高兴！

这是我的源代码，带有注释和 console log 作为屏幕截图。所以你可以看到代码有效。

converse(msg: string) {

    const userMessage = new Message(msg, 'user'); //gettng user message
    this.update(userMessage); 
   
    var bot = new RiveScript({utf8: true}); // initializing bot
     
    bot.loadFile('/assets/brain/test.rive').then(loading_done); // loading bot brain

    function loading_done() {
      console.log("Chatbot initialized!"); 
      bot.sortReplies();  //sorting replies 
    
      let username = "user";
      
      return bot.reply(username, msg).then(answer => { //getting chatbot answer
        console.log("User: " + msg);
        console.log("Chatbot: " + answer);
        const result = answer; 
        const botMessage = new Message(result, 'bot');  
        this.update(botMessage);
      }); 
    }
  }

Answer 1

不要使用定义自己的 this 上下文的函数，而是使用箭头函数：

const loading_done = () => {
      console.log("Chatbot initialized!"); 
      bot.sortReplies();  //sorting replies 
    
      let username = "user";
      
      return bot.reply(username, msg).then(answer => { //getting chatbot answer
        console.log("User: " + msg);
        console.log("Chatbot: " + answer);
        const result = answer; 
        const botMessage = new Message(result, 'bot');  
        this.update(botMessage);
      }); 
    }

由于您使用的是打字稿，您还可以将 loading_done 设为私有函数：

converse(msg: string) {

    const userMessage = new Message(msg, 'user'); //gettng user message
    this.update(userMessage); 
   
    var bot = new RiveScript({utf8: true}); // initializing bot
     
    bot.loadFile('/assets/brain/test.rive').then(this.loadingDone); // loading bot brai
  }

// Use camel case instead of snake case in typescript.
private loadingDone = () => {
      console.log("Chatbot initialized!"); 
      bot.sortReplies();  //sorting replies 
    
      let username = "user";
      
      return bot.reply(username, msg).then(answer => { //getting chatbot answer
        console.log("User: " + msg);
        console.log("Chatbot: " + answer);
        const result = answer; 
        const botMessage = new Message(result, 'bot');  
        this.update(botMessage);
      }); 
}

Answer 2

尝试

converse(msg: string) {

    const userMessage = new Message(msg, 'user'); //gettng user message
    this.update(userMessage); 
   
    var bot = new RiveScript({utf8: true}); // initializing bot
     
    const loading_done = (bot) => ()=> {
      console.log("Chatbot initialized!"); 
      bot.sortReplies();  //sorting replies 
    
      let username = "user";
      
      return bot.reply(username, msg).then(answer => { //getting chatbot answer
        console.log("User: " + msg);
        console.log("Chatbot: " + answer);
        const result = answer; 
        const botMessage = new Message(result, 'bot');  
        this.update(botMessage);
      }); 
    } 

  bot.loadFile('/assets/brain/test.rive').then(loading_done(bot)); // loading bot brain

  }

或

   loading_done(bot){ 
return  ()=> {
const that = this;
      console.log("Chatbot initialized!"); 
      bot.sortReplies();  //sorting replies 
    
      let username = "user";
      
      return bot.reply(username, msg).then(answer => { //getting chatbot answer
        console.log("User: " + msg);
        console.log("Chatbot: " + answer);
        const result = answer; 
        const botMessage = new Message(result, 'bot');  
        that.update(botMessage);
      }); 
    } 
}

converse(msg: string) {

    const userMessage = new Message(msg, 'user'); //gettng user message
    this.update(userMessage); 
   
    var bot = new RiveScript({utf8: true}); // initializing bot
     


  bot.loadFile('/assets/brain/test.rive').then(this.loading_done(bot).bind(this)); // loading bot brain

  }

但我相信第一个解决方案更清晰

问题 "Uncaught (in promise) TypeError" Angular 中的 RiveScript 聊天机器人

Problem "Uncaught (in promise) TypeError" RiveScript chatbot in Angular

javascript

chatbot

typescript

rivescript

angular