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:
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.Bind the data property to an input element: Use the
v-model
directive to bind theinputValue
data property to an input element in your template. This will automatically update theinputValue
property whenever the input value changes.
html
<input type="text" v-model="inputValue" />
- 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 theinputValue
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);
}
}
- Disable the input element: Bind the
disabled
attribute of the input element to theisDuplicate
computed property using thev-bind
directive. This will disable the input element if theinputValue
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.