Javascript gets in trouble for saying this is undefined.

I am currently a beginner studying JavaScript.
The code is debugged below, and "letres_=await this.callApi("
) If the callApi is undefined, you will get in trouble.

There is no description of callApi in the code below, but
It certainly describes "let values = wait this.callApi(this.METHOD.GET,..."
I don't understand why I get scolded for undefined because I have been able to execute the part.
How do I write it down to load it?

Could you teach me?Thank you for your cooperation.

async test(){
      const {hennsu1,hennsu2,hennsu3} = this.info;
      // Get global IP
      const network_info = wait fetch (this.GET_GLOBAL_IP)
        .then(res=>res.json())

      let values = wait this.callApi(this.METHOD.GET,`${this.URL_ENDPOINT.AAAA}/${this.AAAA.XXXXXX}`);

      varcamera_url='"
      var success_code = this.STATUS_CODE.SUCCESS

      if(values&values.code==this.STATUS_CODE.SUCCESS){
        let duration = null
        bootbox.prompt({
            title —This.title,
            message —This.message,
            inputType: 'radio',
            inputOptions: [{
                text:values.payload[0].explanation,
                value: values.payload[0].value
            },
            {
                text:values.payload[1].explanation,
                value: values.payload[1].value
            }],
            callback:async function (result) {
              if(result!=null){
                letres_=wait this.callApi(
                  this.METHOD.GET,
                  `${this.URL_ENDPOINT.xxx}/${network_info.ip}/${result}/${hennsu1}/${hennsu2}`);

                if(res_&res_.code==success_code){
                  camera_url=`http://${res_.payload.xxxx}:${res_.payload.xxxxX}/${hennsu3===null?':hennsu3}`;
                  window.open(camera_url, '_blank');
                }
              }
            }
        });
      } else{
        constmsg=res&res.message?res.message:this.UNEXPECTED_ERR;
        bootbox.alert(msg);
      }
    },

javascript vue.js

2022-09-29 22:16

1 Answers

This callback: What this becomes when async function(result){ is called depends on the bootbox.prompt() specification implementation.

Fix this by changing to the Arrow function or adding .bind(this).

2022-09-29 22:16

If you have any answers or tips

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