I was going through this answer on SO : Is there a proper way of resetting a component's initial data in vuejs?
However, the current method is not allowed now and VueJS prohibits changing the $data var.
As you can see here in this https://github.com/vuejs/vue/issues/2873 ( $data is not allowed to be modified. )
So if I try the above method, I am getting a VueJS warning:
[Vue warn]: Avoid replacing instance root $data. Use nested data properties instead.
Here is my JS code,
function initialState () {
return {
h2: 0,
ch4: 0,
c2h6: 0,
c2h4: 0,
c2h2: 0,
c3h8: 0,
c3h6: 0,
co: 0,
co2: 0,
o2: 0,
n2: 0,
selected: ''
}
}
export default {
name: 'something',
data () {
return initialState() // This is working fine
},
computed: {
tdcg: function () {
// some logic here...
}
},
methods: {
resetFields: function () {
this.$data = initialState() // --> This is what I want to achieve!
}
}
}
So what is the correct and the easiest way of re initialising my data?
You can use Object.assign
to iterate through all properties and assign them:
export default {
data () {
return {
h2: 0,
// other attributes...
};
},
methods: {
resetFields () {
Object.assign(this.$data, this.$options.data.call(this));
}
}
}
Here's a demo fiddle: https://jsfiddle.net/797yyvtz/
Note: I'm using this.$options.data
to call the original data
method again to get a fresh copy of the data. No need for a separate initialState
function. The data
method is the initial state function.
Did you try iterating through the initialState object and setting it again? Here is the sample code:
function initialState() {
return {
h2: 0,
ch4: 0,
// and so on... finally
selected: ''
}
}
export default {
name: 'something',
data: function() {
return initialState()
},
computed: {
// ...
},
methods: {
resetFields: function() {
// Fetch the initialState object locally, so we do not have to call the function again
let initialData = initialState();
// Iterate through the props
for (let prop in initialData) {
// Reset the prop locally.
this[prop] = initialData[prop];
}
}
}
}
In my limited experiments locally, it does seem to work. Let me know your thoughts on this method.
Wrap all the data into a dict with a key called "data" or other thing. Then you can re-initialize whole data by set this.data = {xx: yy}, or directly change one data item like this.data.h2 = 2.
function initialState () {
return {
h2: 0,
ch4: 0,
c2h6: 0,
c2h4: 0,
c2h2: 0,
c3h8: 0,
c3h6: 0,
co: 0,
co2: 0,
o2: 0,
n2: 0,
selected: ''
}
}
export default {
name: 'something',
data () {
return {data: initialState()} // This is working fine
},
computed: {
tdcg: function () {
// some logic here...
}
},
methods: {
resetFields: function () {
this.data = initialState() // --> This is what I want to achieve!
}
}
}
You can try this:
export default { // Initialize your data data() { return { // Initialize the form field (STEP 1) formFields: { name: '', email: '', password: '', moreData: { field1: '', field2: [], }, }, // Create an object property used for cloning (STEP 2) formFieldsCopy: {}, }; }, // When the DOM is mounted copy the // formField you want to a temporary field // You can use lodash ._clone or ES6 spread operator (STEP 3) mounted() { this.formFieldsCopy = { ...this.formFields }; }, methods: { // Write the function to reset the form (STEP 4) resetFormFields() { this.formFields = { ...this.formFieldsCopy }; }, submit() { // Do you normal Axios requests here // and call you reset function. (STEP 5). this.resetFormFields(); }, }, };
My solution:
mounted(){
this.saveData() // you can load if you need previous data
},
methods: {
saveData(){
localStorage.setItem(this.$options.name,JSON.stringify(this.$data));
},
loadData(){
if (localStorage.getItem(this.$options.name) !== null) {
let data= JSON.parse(localStorage.getItem(this.$options.name));
Object.keys(data).forEach((key)=>{this[key] = data[key];});
}
}
}
When you need you can load or save them again
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.