Vue Data Array

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Searching For Items In An Array

Modified1 year, 4 months ago. I'm new to Vuejs. Made something, but I don't know it's the simple / right way. I want some dates in an array and update them on a event. First I tried Vue.set, but it dind't work out. Now after changing my array item:. I push() nothing to the array and it will update. But sometimes the last item will be hidden, somehow.. I think this solution is a bit hacky, how can I make it stable? Simple code is here:. 44 gold badges2525 silver badges3535 bronze badges.

3535 bronze badges.

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Vue.component('new component name', {
data: function () {
return {
count: 0
}
},
template: ''
})

For all object changes that need reactivity use Vue.set(object, prop, value). For array mutations, you can look at the currently supported list here. For vuex you will want to do Vue.set(state.object, key, value). So just for others who come to this question.

It appears at some point in Vue 2.* they removed this.items.$set(index, val) in favor of this.$set(this.items, index, val).

data: function () {
return {
count: 0
}
}

Improve your user’s access to the relevant data

  • Splice is still available and here is a link to array mutation methods available in vue link.
  • 22 gold badges88 silver badges1111 bronze badges.
  • 1111 bronze badges. VueJS can't pickup your changes to the state if you manipulate arrays like this.
  • As explained in Common Beginner Gotchas, you should use array methods like push, splice or whatever and never modify the indexes like this a[2] = 2 nor the .length property of an array.
  • 5858 bronze badges. 8,49666 gold badges3434 silver badges5555 bronze badges.

Sorting Alphabetically

3434 silver badges5555 bronze badges. As stated before - VueJS simply can't track those operations(array elements assignment).All operations that are tracked by VueJS with array are here.But I'll copy them once again:.

v-for with an Object

During development, you face a problem - how to live with that :).

App.vue file contained following code


Note: if you just need to modify an item field - you can do it just by:. And this would be tracked by VueJS as the item(Object) fields would be tracked. You need to empty the array:. Actually you can do much more with this function splice() - w3schools linkYou can add multiple records, delete multiple records, etc. Vue.set() and Vue.delete(). Vue.set() and Vue.delete() might be used for adding field to your UI version of data.

For example, you need some additional calculated data or flags within your objects. You can do this for your objects, or list of objects(in the loop):. And send edited data back to the back-end in the same format doing this before the Axios call:.

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Mykola KorolMykola Korol.

App.vue:


One alternative - and more lightweight approach to your problem - might be, just editing the array temporarily and then assigning the whole array back to your variable. Because as Vue does not watch individual items it will watch the whole variable being updated. So you this should work as well:.

This then should also update your DOM. 11 gold badge44 silver badges1616 bronze badges. 1616 bronze badges. Observe object and array reactivity here:. SumapigReamon C. For all object changes that need reactivity use Vue.set(object, prop, value). For array mutations, you can look at the currently supported list here.

Conclusion

For vuex you will want to do Vue.set(state.object, key, value).

So just for others who come to this question.



It appears at some point in Vue 2.* they removed this.items.$set(index, val) in favor of this.$set(this.items, index, val). Splice is still available and here is a link to array mutation methods available in vue link.

Maintaining State

VueJS can't pickup your changes to the state if you manipulate arrays like this.

HelloWorld.vue
Source Code for HelloWorld.vue as follows.


As explained in Common Beginner Gotchas, you should use array methods like push, splice or whatever and never modify the indexes like this a[2] = 2 nor the .length property of an array. As stated before - VueJS simply can't track those operations(array elements assignment).All operations that are tracked by VueJS with array are here.But I'll copy them once again:.

During development, you face a problem - how to live with that :).

push(), pop(), shift(), unshift(), sort() and reverse() are pretty plain and help you in some cases but the main focus lies within the splice(), which allows you effectively modify the array that would be tracked by VueJs.So I can share some of the approaches, that are used the most working with arrays. You need to replace Item in Array:. Note: if you just need to modify an item field - you can do it just by:. And this would be tracked by VueJS as the item(Object) fields would be tracked. You need to empty the array:. Actually you can do much more with this function splice() - w3schools linkYou can add multiple records, delete multiple records, etc. Vue.set() and Vue.delete(). Vue.set() and Vue.delete() might be used for adding field to your UI version of data.

For example, you need some additional calculated data or flags within your objects. You can do this for your objects, or list of objects(in the loop):. And send edited data back to the back-end in the same format doing this before the Axios call:. Full project: CodePen. If you are gonna build a web app, you will probably have to display some data of the user.To make it easier for users to access the relevant data, we can sort and filter their data.In this article, I will show you how you can do this with Vue.

So let’s say you are trying to make a web app to display a bunch of different recipes.These recipes all have different properties.For a recipe, it’s important to know what ingredients you will need and how much time you need to cook.To improve the user experience, we will add some filters for these values and we’ll add a search function to look for a specific recipe.

First, we’ll need to create an array of recipes.So let’s add the following four recipes to our data.

Filtering Array Items

Every object in this array has the following variables:. ingredients (array). In the CodePen I added some HTML and CSS to display our array of objects as cards. To loop over the information in our array, we use v-for. The HTML elements we will need for sorting, filtering, and searching in our array is the following:.

Sorting Numerically

A select tag with two options: 1. Alphabetically2. A button to toggle between ascending and descending.I’ve used a font-awesome icon to show a corresponding icon. Two input tags for:1.