How can I set a default value for a v-select using a function in vue.js / vuetify?

I'm new to utilizing vuetify and I am curious if there is a method to set a value for a v-select using a function. My form can create an enterprise, leveraging apollo.js to connect with the database. Although all fields populate correctly when modifying an enterprise, I want the v-select to show the same value that the user previously selected. The code snippet for my v-select on the "modify" page:

<v-select
 item-text="text"
 item-value="value"
 v-model="defaultSelected"
 :items="qualifications"
 menu-props="auto"
 :rules="SelectRules"
></v-select>

The data :

export Default{
data: () => ({
defaultSelected{ value: "I need to implement a function here to establish a default value for the v-select" }
qualifications: [
 { text: "Blacklisted", value: "0"}
 { text: "Qualified", value: "1"}
 { text: "Non-qualified", value: "2"}
 { text: "High risk", value: "3"}
],
}),

I attempted this approach but it led to multiple errors:

export Default{
 data: () => ({
 defaultSelected{ value: renderQualificationValue }
 qualifications: [
  { text: "Blacklisted", value: "0"}
  { text: "Qualified", value: "1"}
  { text: "Non-qualified", value: "2"}
  { text: "High risk", value: "3"}
 ],
}),

methods: {

 renderQualificationValue(qualification)
  if (qualification === 0) return "0";
  else if (qualification === 1) return "1";
  else if (qualification === 2) return "2";
  else if (qualification === 3) return "3";
}

To clarify, I simply want to know if there exists a way to assign or define a value using a function.

Your assistance is greatly valued, thank you!

Answer №1

Priority Number One

The correct syntax is <strong>defaultSelected: { value: renderQualificationValue }</strong>, not defaultSelected{ value: renderQualificationValue }
.

Secondly

Your requirement calls for a computed property implementation in your code.

To achieve this, make sure your code resembles the following structure:

export Default {
  data: () => ({
    qualifications: [
      { text: "Blacklisted", value: "0" },
      { text: "Qualified", value: "1" },
      { text: "Non-qualified", value: "2" },
      { text: "High risk", value: "3" }
    ],
    qualification: "1"
  }),
  computed: {
    // Returns the Number type of qualification
    qualificationValue () {
      return Number.parseInt(this.qualification)
    }
  }
}
<v-select
 item-text="text"
 item-value="value"
 v-model="qualificationValue"
 :items="qualifications"
 menu-props="auto"
 :rules="SelectRules"
></v-select>

Third Point

Using v-model alone will only provide values as a getter without reading data from v-select.

You might want to consider splitting your computed property into Getter and Setter methods for an alternative approach.

//...
computed: {
    // Returns the Number type of qualification
    qualificationValue {
      get () {
        return Number.parseInt(this.qualification)
      },
      set (newValue) {
        // Perform actions while setting
        // For instance:
        this.qualification = newValue
      }
  }
//...

Forthcoming

Consider keeping your variable as a number instead of parsing it repeatedly when reading it. Transformation can be done during assignment rather than retrieval, depending on your environment.

An example implementation could look like this:

export Default {
  data: () => ({
    qualifications: [
      { text: "Blacklisted", value: "0" },
      { text: "Qualified", value: "1" },
      { text: "Non-qualified", value: "2" },
      { text: "High risk", value: "3" }
    ],
    qualification: 1
  }),
  qualificationValue {
      get () {
        return this.qualification
      },
      set (newValue) {
        this.qualification = Number.parseInt(newValue)
      }
  }
}

Important Note:

Computed getters do not support input parameters. If such functionality is required, consider using a function instead.

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