vuejs use set to prevent duplicates

To prevent duplicates in Vue.js using the v-model directive, you can use the set method. Here are the steps to achieve this:

  1. Create a data property: In your Vue component, define a data property that will hold the value you want to check for duplicates. For example, you can create a data property called inputValue and initialize it with an empty string.

  2. Bind the data property to an input element: Use the v-model directive to bind the inputValue data property to an input element in your template. This will automatically update the inputValue property whenever the input value changes.

html <input type="text" v-model="inputValue" />

  1. Define a computed property: Create a computed property that will check if the inputValue already exists in an array or any other data structure where you want to prevent duplicates. This computed property will return a boolean value indicating whether the inputValue is a duplicate or not.

javascript computed: { isDuplicate() { // Check if the inputValue exists in your data structure // and return true if it is a duplicate, false otherwise return this.dataArray.includes(this.inputValue); } }

  1. Disable the input element: Bind the disabled attribute of the input element to the isDuplicate computed property using the v-bind directive. This will disable the input element if the inputValue is a duplicate.

html <input type="text" v-model="inputValue" :disabled="isDuplicate" />

By following these steps, the input element will be disabled if the inputValue is already present in the dataArray, preventing duplicates.