Generate an array of responses within a child component and then send this array to the parent component using Vue.js 2

Question

Generate an array of responses within a child component and then send this array to the parent component using Vue.js 2

Currently, I am in the process of creating a survey using Vue 2. My goal is to construct and emit the answers array to a parent component named Evaluation. You can view the structure of this array here: https://pastebin.com/rLEUh56a

Within my project, there exists a component known as QuestionItem.vue, which serves as the child component of Evaluation. Details regarding this component can be found here: https://pastebin.com/RFPgKs5Q

The format of the answers array needs to adhere to specific criteria for successful transmission to the API:

answers: [
  {
    questionId: "6a9ad778-aacf-4e60-9610-37a767700b9f",
    questionOptionIds:[
      "1bc35f6c-900a-4764-84ee-23531e46e638",
    ],
    answer: null
  },
  {
    questionId: "d1c3f4f0-9525-4e6e-bb81-599d84b5cb02f",
    questionOptionIds:[],
    answer: "answered value"
  },
]

In situations where the question.type is categorized as text, range, stars, or faces, it is required that the questionOptionIds remain empty while the answer property contains the user's response. Conversely, if the question.type corresponds to radio or check, the answer should be null, and the questionOptionIds must reflect the selected option.

I am currently facing challenges in constructing this array based on the information inputted in the QuestionItem.vue component. Any guidance on how to accomplish this task would be greatly appreciated. Thank you for your time and have a wonderful day!

javascript arrays vue.js object emit

Answer 1

Answer №1

Using v-model for managing answers in your QuestionItem component is not recommended:

<QuestionItem 
                                v-for="(question, index) in questions"
                                :key="index"
                                :question="question"
                                :index="questionIndex"
                                v-model="answers"
                                class="flex-none w-full"
                            />

v-model assigns the emitted input value from the child directly to answers, but since answers is an array of answers instead of a single answer, this approach doesn't make sense.

To address this issue, you need to create a custom event handler in the parent component. Here's an example:

// in Evaluation.vue methods
answerChanged(answer) {
    // Remove existing answer if it already exists in the array
    answers = answers.filter(a=>a.questionId != answer.questionId);
    // Add the provided answer
    answers.push(answer);
}

Instead of using v-model, utilize the event handler as shown below:

 <QuestionItem 
                                v-for="(question, index) in questions"
                                :key="index"
                                :question="question"
                                :index="questionIndex"
                                @input="answerChanged" // Bind the event handler
                                class="flex-none w-full"
                            />

Lastly, ensure that the questionId is included in the emitted value. Below is a general representation which may need adjustments based on your specific requirements:

 watch: {
    questionValue(newValue) {
        // Emitting the desired value for a single answer within our parent answers array
        this.$emit('input', {
           questionId: question.id,
           questionOptionIds:question.options,
           answer: newValue
        })
    },
},

Answer 2

Using v-model for managing answers in your QuestionItem component is not recommended:

<QuestionItem 
                                v-for="(question, index) in questions"
                                :key="index"
                                :question="question"
                                :index="questionIndex"
                                v-model="answers"
                                class="flex-none w-full"
                            />

v-model assigns the emitted input value from the child directly to answers, but since answers is an array of answers instead of a single answer, this approach doesn't make sense.

To address this issue, you need to create a custom event handler in the parent component. Here's an example:

// in Evaluation.vue methods
answerChanged(answer) {
    // Remove existing answer if it already exists in the array
    answers = answers.filter(a=>a.questionId != answer.questionId);
    // Add the provided answer
    answers.push(answer);
}

Instead of using v-model, utilize the event handler as shown below:

 <QuestionItem 
                                v-for="(question, index) in questions"
                                :key="index"
                                :question="question"
                                :index="questionIndex"
                                @input="answerChanged" // Bind the event handler
                                class="flex-none w-full"
                            />

Lastly, ensure that the questionId is included in the emitted value. Below is a general representation which may need adjustments based on your specific requirements:

 watch: {
    questionValue(newValue) {
        // Emitting the desired value for a single answer within our parent answers array
        this.$emit('input', {
           questionId: question.id,
           questionOptionIds:question.options,
           answer: newValue
        })
    },
},

Generate an array of responses within a child component and then send this array to the parent component using Vue.js 2

Answer №1

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