Disabling a button in Vue.js when form inputs remain unchanged

Question

Disabling a button in Vue.js when form inputs remain unchanged

I am facing a challenge with multiple forms that were created from an API. I need to constantly monitor if the input values within each form have been changed in order to toggle the button between disabled and enabled states.

To address this issue, I attempted to create a single flag: isChanged: false. This allowed me to control the button like this:

<v-btn
  :disabled="!isChanged"
>
  Save
</v-btn>

However, dealing with multiple forms means I might need to generate multiple flags dynamically for each form. Unfortunately, I am unsure of how to achieve this efficiently.

In addition, there is a Save All button which could require a new flag like isChangedAny: false to determine whether any of the forms have been altered or not.

If any input value within a form changes, the 'Save All' button should transition from a disabled state to an enabled one. Yet, my main struggle lies in developing a method to accurately detect these changes in the form inputs. Can someone guide me on this?

Check out the CodePen Demo here

javascript vue.js

Answer 1

Answer №1

To effectively manage changes in multiple forms, a solution is to create individual watchers for each form after retrieving the data. These watchers will track any modifications and store the IDs of the changed forms:

  data: () => ({
    items: [],
    changed: []
  }),
  mounted () {
    this.getData();
    // The code below should be executed within a callback function when the getData() method is asynchronous.
    this.items.forEach((item, index) => {
      this.$watch(['items', index].join('.'), 
        {
          deep: true, 
          handler: (newVal, oldVal) => {
            this.changed.push(newVal.id)
          }
        }
      );
    });
  }

After capturing the changes in the changed array, it's possible to check if a specific ID exists within this array. If a matching ID is found, the corresponding form can then be activated. Moreover, by checking if the changed array has a length greater than 0, it becomes feasible to activate the saveAll feature.

For a practical demonstration, refer to the following functional CodePen demo.

Answer 2

To effectively manage changes in multiple forms, a solution is to create individual watchers for each form after retrieving the data. These watchers will track any modifications and store the IDs of the changed forms:

  data: () => ({
    items: [],
    changed: []
  }),
  mounted () {
    this.getData();
    // The code below should be executed within a callback function when the getData() method is asynchronous.
    this.items.forEach((item, index) => {
      this.$watch(['items', index].join('.'), 
        {
          deep: true, 
          handler: (newVal, oldVal) => {
            this.changed.push(newVal.id)
          }
        }
      );
    });
  }

After capturing the changes in the changed array, it's possible to check if a specific ID exists within this array. If a matching ID is found, the corresponding form can then be activated. Moreover, by checking if the changed array has a length greater than 0, it becomes feasible to activate the saveAll feature.

For a practical demonstration, refer to the following functional CodePen demo.

Answer 3

Answer №2

To tackle this issue, you have two main approaches:

One option is to monitor the @input event on a form field, setting a flag to hasChanged once triggered. While simple, this method may not be foolproof as it won't detect if the user reverts the value back to its original state.
Alternatively, another approach involves creating a duplicate of the initial form data within the mounted() hook and leveraging a computed property to compare the current input with the original data. Although more complex to implement, this second solution is likely more robust in maintaining form integrity.

Answer 4

To tackle this issue, you have two main approaches:

One option is to monitor the @input event on a form field, setting a flag to hasChanged once triggered. While simple, this method may not be foolproof as it won't detect if the user reverts the value back to its original state.
Alternatively, another approach involves creating a duplicate of the initial form data within the mounted() hook and leveraging a computed property to compare the current input with the original data. Although more complex to implement, this second solution is likely more robust in maintaining form integrity.

Disabling a button in Vue.js when form inputs remain unchanged

Answer №1

Answer №2

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