Using Vue js to Specify the Type of a Prop

Question

Using Vue js to Specify the Type of a Prop

I am currently working on a Vue.js component that requires a prop named idFieldType

The goal is to only allow this prop to accept values of type Number or String

To achieve this, I implemented the following code:

idFieldType: {
    Type: Function,
    default: function() {
        return Number;
    },
    validator: function(value) {
         if(value == String || value == Number) {
               return true;
         }

         return false;    
    }
}

I also experimented with changing the type to Object.

My main concern is how can I create a prop that restricts input to specific types?

javascript vue.js vuejs2 vue-component

Answer 1

Answer №1

Vue.JS has a convenient built-in feature for validating props, allowing you to specify type, whether they are required or not, and even set default values.

Vue.component('example', {
  props: {
    // basic type check (`null` means accept any type)
    propA: Number,
    // multiple possible types
    propB: [String, Number],
    // a required string
    propC: {
      type: String,
      required: true
    },
    // a number with default value
    propD: {
      type: Number,
      default: 100
    },
    // object/array defaults should be returned from a
    // factory function
    propE: {
      type: Object,
      default: function () {
        return { message: 'hello' }
      }
    },
    // custom validator function
    propF: {
      validator: function (value) {
        return value > 10
      }
    }
  }
})

It's worth noting that in Vue.js, you can also define props with multiple possible types like propB: [String, Number],, which is quite helpful. For more information on prop validation, you can refer to the official wiki page.

Answer 2

Vue.JS has a convenient built-in feature for validating props, allowing you to specify type, whether they are required or not, and even set default values.

Vue.component('example', {
  props: {
    // basic type check (`null` means accept any type)
    propA: Number,
    // multiple possible types
    propB: [String, Number],
    // a required string
    propC: {
      type: String,
      required: true
    },
    // a number with default value
    propD: {
      type: Number,
      default: 100
    },
    // object/array defaults should be returned from a
    // factory function
    propE: {
      type: Object,
      default: function () {
        return { message: 'hello' }
      }
    },
    // custom validator function
    propF: {
      validator: function (value) {
        return value > 10
      }
    }
  }
})

It's worth noting that in Vue.js, you can also define props with multiple possible types like propB: [String, Number],, which is quite helpful. For more information on prop validation, you can refer to the official wiki page.

Answer 3

Answer №2

Ah, I've finally found the solution!

idFieldType: {
                type: Function,
                default: Number,
                validator: function (value) {
                    if (value() == String || value() == Number) {
                        return true;
                    }

                    return false;
                }
            }

The issue arose from specifying the type as Function while the default was expecting a function. It turns out I was inadvertently returning a function within another function :)

Answer 4

Ah, I've finally found the solution!

idFieldType: {
                type: Function,
                default: Number,
                validator: function (value) {
                    if (value() == String || value() == Number) {
                        return true;
                    }

                    return false;
                }
            }

The issue arose from specifying the type as Function while the default was expecting a function. It turns out I was inadvertently returning a function within another function :)

Using Vue js to Specify the Type of a Prop

Answer №1

Answer №2

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