Issue with Vue.js displaying an undefined error for object value during loading and rendering

Question

Issue with Vue.js displaying an undefined error for object value during loading and rendering

Hey there! I have some experience with Vue, but this particular issue is really getting to me. What am I missing here?

So, I have an object that I load via an ajax call within the mounted method:

job: {
  "title": "value",  
  "location": {
    "name":"HONG KONG"
  }
}

When I try to access {{ job.title }}, everything works fine. But when I try to access {{ job.location.name }}, I get an undefined error even though the value still shows up. And when I just try to view {{ job.location }}, I see the json object so it is defined.

It's frustrating because I know it should be simple, but for some reason, I can't figure out why it's not working as expected.

// Adding on

Here's my entire Vue class:

    const router = new VueRouter({
        mode: 'history',
        routes: []
    });
    const app = new Vue( {
      router,
      el: '#app',
      data: {
        job: {}
      },
      mounted: function () {
        var vm = this
        jQuery.ajax({
            url: 'https://xxx' + this.jobId,
            method: 'GET',
            success: function (data) {
                vm.job = data;
            },
            error: function (error) {
                console.log(error);
            }
        });
      },
      computed: {
        jobId: function() {
            return this.$route.query.gh_jid
        }
      }
    })

javascript vue.js

Answer 1

Answer №1

When your component is rendered, it attempts to retrieve a value from job.location.name, but the location object is undefined prior to the completion of the ajax request. This results in an error resembling

Cannot read property 'name' of undefined

.

To resolve this issue, you can create a computed property called locationName and have it return an empty string if the job object has not been loaded yet:

computed:{
//...
    locationName() {
       return this.job.location ? this.job.location.name : '';
    }
}

Alternatively, you could define a computed property for location and return an empty object if no location exists. Another solution would be to include an empty location object in your initial data (if you are certain that the API response always includes location), such as job: { location: {}}. Any of these approaches will resolve the issue.

Another option is to use the v-if directive in your template to handle this situation:

<div v-if="job.location">
   {{ job.location.name }}
   <!-- other location related content -->
</div>

Answer 2

When your component is rendered, it attempts to retrieve a value from job.location.name, but the location object is undefined prior to the completion of the ajax request. This results in an error resembling

Cannot read property 'name' of undefined

.

To resolve this issue, you can create a computed property called locationName and have it return an empty string if the job object has not been loaded yet:

computed:{
//...
    locationName() {
       return this.job.location ? this.job.location.name : '';
    }
}

Alternatively, you could define a computed property for location and return an empty object if no location exists. Another solution would be to include an empty location object in your initial data (if you are certain that the API response always includes location), such as job: { location: {}}. Any of these approaches will resolve the issue.

Another option is to use the v-if directive in your template to handle this situation:

<div v-if="job.location">
   {{ job.location.name }}
   <!-- other location related content -->
</div>

Answer 3

Answer №2

Here's a handy ES6 approach for solving this:

computed: {
  getJobLocation(){
    return this.job?.location.name
  }
}

Learn more about Optional Chaining

Answer 4

Here's a handy ES6 approach for solving this:

computed: {
  getJobLocation(){
    return this.job?.location.name
  }
}

Learn more about Optional Chaining

Issue with Vue.js displaying an undefined error for object value during loading and rendering

Answer №1

Answer №2

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