What is the best way to validate Object type props in VueJS to guarantee that certain fields are defined within the object?
For instance, I need to make sure that the user prop includes 'name', 'birthDate', and other specific fields.
Appreciate any assistance in advance.
You have the ability to create a custom validator function for objects:
Visit this link for more information on Prop Validation in Vue.js
props: {
propF: {
validator: function (value) {
return value > 10
}
}
}
The validator function should return true if all fields are present.
For an example, check out this JSFiddle demo: JSFiddle Demo
<div id="app">
<child :myprop="myObj"></child>
</div>
Vue.component('child', {
template: `<span>{{ myprop.id }} {{ myprop.name }}</span>`,
props: {
myprop: {
validator: function(obj) {
return (obj.id && Number.isInteger(obj.id) && obj.name && obj.name.length );
}
}
}
});
new Vue({
el: '#app',
data: {
myObj: {
id: 10,
name: 'Joe'
}
}
});
If the validator fails, you will see a Vue warn in the browser console.
Another way to tackle this is by utilizing javascript constructor functions, as demonstrated in this specific example.
This method involves using the constructor function Person() for type checking, potentially leading to more organized and concise code.
It's important to note that otherObj fails the type check (as indicated by the console warning) because it doesn't adhere to the constructor function requirement. This approach enforces the use of constructor functions over plain objects.
You can learn more about this technique in the vue2-docs and vue3-docs.
Here is a sample validation function I created for handling display delay properties in milliseconds for an item that toggles visibility on and off the screen. The property can be either a number representing both the show and hide delays, or it can be an object defining separate delays for each case.
To ensure the correct data type, I validate each expected key to match the type 'number'. If a key is missing, its type will default to 'undefined'. Additionally, negative values are not permissible in this scenario.
props: {
delay: {
type: [Number, Object],
default: 0,
validator(value) {
if (typeof value === 'number') {
return value >= 0;
} else if (value !== null && typeof value === 'object') {
return typeof value.show === 'number' &&
typeof value.hide === 'number' &&
value.show >= 0 &&
value.hide >= 0;
}
return false;
}
},
}
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