Vue: Customize data based on userAgent

Question

Vue: Customize data based on userAgent

As a newcomer to VUE, I am attempting to dynamically modify the disabled value based on the userAgent in order to display or hide the paymentMethod:

data() {
            return {
                paymentMothods: [
                    { name: 'Visa checkout', img: 'visa.png', disabled: false, height: '19', class: 'v-button' },
                    { name: 'PayPal', img: 'paypal.png', disabled: false, height: '18.9', class: '' },
                    { name: 'PhonePE', img: 'phonepe.png', disabled: true, height: '18.9', class: 'phonepe' },
                ]
           }
},

If the userAgent is phonepe-webview, I am trying to adjust the value as follows:

methods: {
            phopepeMatch: function () {
                let userAgent = navigator.userAgent
                let phonepeMatch = userAgent.match("phonepe-webview")
                if (phonepeMatch === "phonepe-webview"){
                    this.paymentMothods[2].disabled = false
                    return true
                }
                else {
                    return false
                }
            }
},

Despite my efforts, the payment method remains invisible :(

javascript vue.js user-agent

Answer 1

Answer №1

There seems to be some confusion about what the match function actually returns. When there is a match, it returns an array and not just the string that was matched. If there is no match, it returns null. You can find more information about this here.

To address this issue, you can make the following adjustments in your code:

checkPhonepeMatch: function () {
  let userAgent = navigator.userAgent;
  let phonepeMatch = userAgent.match("phonepe-webview");
  if (phonepeMatch === null) {
    return false;
  } else {
    this.paymentMethods[2].disabled = false;
    return true;
  }
}

Answer 2

There seems to be some confusion about what the match function actually returns. When there is a match, it returns an array and not just the string that was matched. If there is no match, it returns null. You can find more information about this here.

To address this issue, you can make the following adjustments in your code:

checkPhonepeMatch: function () {
  let userAgent = navigator.userAgent;
  let phonepeMatch = userAgent.match("phonepe-webview");
  if (phonepeMatch === null) {
    return false;
  } else {
    this.paymentMethods[2].disabled = false;
    return true;
  }
}

Answer 3

Answer №2

Utilize the .splice() method.

methods: {
        phopepeMatch: function () {
            let userAgent = navigator.userAgent
            let phonepeMatch = userAgent.match("phonepe-webview")
            if (phonepeMatch === "phonepe-webview"){
                // First, make a copy of the object
                let payment_method = this.paymentMothods[2];
                // Next, modify the desired property of the object
                payment_method.disabled = false;
                // Finally, replace the old object with the updated one
                this.paymentMothods.splice(2, 1, payment_method);
                return true
            }
            else {
                return false
            }
        }

},

Additional details:

In the Vue documentation, specifically in the Reactivity in depth section, it mentions:

Vue cannot automatically detect the following array changes:

1.) Directly setting an item using the index, e.g., vm.items[indexOfItem] = newValue

2.) Changing the length of the array, e.g., vm.items.length = newLength

However, there is a way to handle this so that Vue's Reactivity System can recognize alterations in arrays.

Instead of doing this:

this.paymentMothods[2].disabled = false

You should follow this approach:

let payment_method = this.paymentMothods[2];

payment_method.disabled = false;

this.paymentMothods.splice(2, 1, payment_method);

or alternatively (using this.$set()):

let payment_method = this.paymentMothods[2];

payment_method.disabled = false;

this.$set(this.paymentMothods, 2, payment_method);

Answer 4

Utilize the .splice() method.

methods: {
        phopepeMatch: function () {
            let userAgent = navigator.userAgent
            let phonepeMatch = userAgent.match("phonepe-webview")
            if (phonepeMatch === "phonepe-webview"){
                // First, make a copy of the object
                let payment_method = this.paymentMothods[2];
                // Next, modify the desired property of the object
                payment_method.disabled = false;
                // Finally, replace the old object with the updated one
                this.paymentMothods.splice(2, 1, payment_method);
                return true
            }
            else {
                return false
            }
        }

},

Additional details:

In the Vue documentation, specifically in the Reactivity in depth section, it mentions:

Vue cannot automatically detect the following array changes:

1.) Directly setting an item using the index, e.g., vm.items[indexOfItem] = newValue

2.) Changing the length of the array, e.g., vm.items.length = newLength

However, there is a way to handle this so that Vue's Reactivity System can recognize alterations in arrays.

Instead of doing this:

this.paymentMothods[2].disabled = false

You should follow this approach:

let payment_method = this.paymentMothods[2];

payment_method.disabled = false;

this.paymentMothods.splice(2, 1, payment_method);

or alternatively (using this.$set()):

let payment_method = this.paymentMothods[2];

payment_method.disabled = false;

this.$set(this.paymentMothods, 2, payment_method);

Vue: Customize data based on userAgent

Answer №1

Answer №2

Additional details:

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