Place things in a specific iteration element in Vue
Let's say I create 20 divs using a v-for.
Then let's say I have a lot of data in an array, and each unordered element of this array belongs in one of the 20 divs (they have an index or something that tells where they belong, but not necessarily all of them).
The simple way to do this would be to iterate over the array on each one of the v-for divs and check if the indexes match and if they do, render them. Something with a v-if element_index == for_index. But this is really inefficient because if there's a lot of data and the v-for has a lot of iterations, this grows a lot for a simple webpage.
Is there a way to do the opposite of this? So first generate the 20 divs, then run through the data array and one by one insert them where they belong?
html vue.js nuxt.js
asked Nov 22 '18 at 22:14
MyntektMyntekt
1511112
add a comment |
Let's say I create 20 divs using a v-for.
Then let's say I have a lot of data in an array, and each unordered element of this array belongs in one of the 20 divs (they have an index or something that tells where they belong, but not necessarily all of them).
The simple way to do this would be to iterate over the array on each one of the v-for divs and check if the indexes match and if they do, render them. Something with a v-if element_index == for_index. But this is really inefficient because if there's a lot of data and the v-for has a lot of iterations, this grows a lot for a simple webpage.
Is there a way to do the opposite of this? So first generate the 20 divs, then run through the data array and one by one insert them where they belong?
html vue.js nuxt.js
asked Nov 22 '18 at 22:14
MyntektMyntekt
1511112
could you share a tried code?
– Boussadjra Brahim
Nov 22 '18 at 22:22
I haven't really tried because I only know what the non optimal solution to this would be. I actually have no idea if my idea is possible. Maybe I should do it in another way
– Myntekt
Nov 22 '18 at 22:23
add a comment |
Let's say I create 20 divs using a v-for.
Then let's say I have a lot of data in an array, and each unordered element of this array belongs in one of the 20 divs (they have an index or something that tells where they belong, but not necessarily all of them).
The simple way to do this would be to iterate over the array on each one of the v-for divs and check if the indexes match and if they do, render them. Something with a v-if element_index == for_index. But this is really inefficient because if there's a lot of data and the v-for has a lot of iterations, this grows a lot for a simple webpage.
Is there a way to do the opposite of this? So first generate the 20 divs, then run through the data array and one by one insert them where they belong?
html vue.js nuxt.js
asked Nov 22 '18 at 22:14
MyntektMyntekt
1511112
Let's say I create 20 divs using a v-for.
Then let's say I have a lot of data in an array, and each unordered element of this array belongs in one of the 20 divs (they have an index or something that tells where they belong, but not necessarily all of them).
The simple way to do this would be to iterate over the array on each one of the v-for divs and check if the indexes match and if they do, render them. Something with a v-if element_index == for_index. But this is really inefficient because if there's a lot of data and the v-for has a lot of iterations, this grows a lot for a simple webpage.
Is there a way to do the opposite of this? So first generate the 20 divs, then run through the data array and one by one insert them where they belong?
html vue.js nuxt.js
html vue.js nuxt.js
asked Nov 22 '18 at 22:14
MyntektMyntekt
1511112
asked Nov 22 '18 at 22:14
MyntektMyntekt
1511112
asked Nov 22 '18 at 22:14
MyntektMyntekt
1511112
asked Nov 22 '18 at 22:14
MyntektMyntekt
1511112
asked Nov 22 '18 at 22:14
MyntektMyntekt
1511112
1511112
could you share a tried code?
– Boussadjra Brahim
Nov 22 '18 at 22:22
I haven't really tried because I only know what the non optimal solution to this would be. I actually have no idea if my idea is possible. Maybe I should do it in another way
– Myntekt
Nov 22 '18 at 22:23
add a comment |
could you share a tried code?
– Boussadjra Brahim
Nov 22 '18 at 22:22
I haven't really tried because I only know what the non optimal solution to this would be. I actually have no idea if my idea is possible. Maybe I should do it in another way
– Myntekt
Nov 22 '18 at 22:23
could you share a tried code?
– Boussadjra Brahim
Nov 22 '18 at 22:22
could you share a tried code?
– Boussadjra Brahim
Nov 22 '18 at 22:22
I haven't really tried because I only know what the non optimal solution to this would be. I actually have no idea if my idea is possible. Maybe I should do it in another way
– Myntekt
Nov 22 '18 at 22:23
I haven't really tried because I only know what the non optimal solution to this would be. I actually have no idea if my idea is possible. Maybe I should do it in another way
– Myntekt
Nov 22 '18 at 22:23
add a comment |
1 Answer
1
active
oldest
votes
I would use reduce to create a "bucket" object keyed by the grouping indexes.
The reduce() method executes a reducer function (that you provide) on each member of the array resulting in a single output value.
Example
new Vue({
el: '#app',
data() {
return {
dataArray:
}
},
computed: {
bucket () {
return this.dataArray.reduce((obj, item) => {
if (!obj.hasOwnProperty(item.index)) {
Object.assign(obj, {
[item.index]: [item]
})
} else {
obj[item.index].push(item)
}
return obj
}, {})
}
},
created() {
for (i = 0; i < 10; i++) {
this.addData()
}
},
methods: {
addData() {
this.dataArray.push({
index: Math.ceil(Math.random() * 3),
name: Math.random().toString(36).substring(7)
})
},
removeData() {
this.dataArray = this.dataArray.slice(1)
}
}
})<div id="app">
<button @click="addData(true)">Add Data</button>
<button @click="removeData">Remove Data</button>
<div v-for="key in Object.keys(bucket)" :key="key">
<h3 style="font-family: monospace">Bucket {{ key }} ({{ bucket[key].length }} items)</h3>
<p v-for="(item, index) in bucket[key]" :key="item.name" style="font-family: monospace; border-bottom: 1px solid rgba(96,125,139,.1)">{{ index + 1 }}. {{ item.name }}</p>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.17/dist/vue.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vue-template-compiler@2.5.17/browser.min.js"></script></script>answered Nov 22 '18 at 22:25
DigitalDrifterDigitalDrifter
8,1652523
Well I have no idea what that does and how it works. But in that approach you can't dynamically add more data for the array, right? Or even dynamically increase the size the div "list"
– Myntekt
Nov 22 '18 at 22:29
You sure can. Computed properties react to changes in the underlying data (iethis.bigArrayOfData)
– Phil
Nov 22 '18 at 22:35
@Myntekt I've updated the answer to demonstrate Phil's comment.
– DigitalDrifter
Nov 23 '18 at 2:57
add a comment |
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I would use reduce to create a "bucket" object keyed by the grouping indexes.
The reduce() method executes a reducer function (that you provide) on each member of the array resulting in a single output value.
Example
new Vue({
el: '#app',
data() {
return {
dataArray:
}
},
computed: {
bucket () {
return this.dataArray.reduce((obj, item) => {
if (!obj.hasOwnProperty(item.index)) {
Object.assign(obj, {
[item.index]: [item]
})
} else {
obj[item.index].push(item)
}
return obj
}, {})
}
},
created() {
for (i = 0; i < 10; i++) {
this.addData()
}
},
methods: {
addData() {
this.dataArray.push({
index: Math.ceil(Math.random() * 3),
name: Math.random().toString(36).substring(7)
})
},
removeData() {
this.dataArray = this.dataArray.slice(1)
}
}
})<div id="app">
<button @click="addData(true)">Add Data</button>
<button @click="removeData">Remove Data</button>
<div v-for="key in Object.keys(bucket)" :key="key">
<h3 style="font-family: monospace">Bucket {{ key }} ({{ bucket[key].length }} items)</h3>
<p v-for="(item, index) in bucket[key]" :key="item.name" style="font-family: monospace; border-bottom: 1px solid rgba(96,125,139,.1)">{{ index + 1 }}. {{ item.name }}</p>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.17/dist/vue.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vue-template-compiler@2.5.17/browser.min.js"></script></script>answered Nov 22 '18 at 22:25
DigitalDrifterDigitalDrifter
8,1652523
Well I have no idea what that does and how it works. But in that approach you can't dynamically add more data for the array, right? Or even dynamically increase the size the div "list"
– Myntekt
Nov 22 '18 at 22:29
You sure can. Computed properties react to changes in the underlying data (iethis.bigArrayOfData)
– Phil
Nov 22 '18 at 22:35
@Myntekt I've updated the answer to demonstrate Phil's comment.
– DigitalDrifter
Nov 23 '18 at 2:57
add a comment |
I would use reduce to create a "bucket" object keyed by the grouping indexes.
The reduce() method executes a reducer function (that you provide) on each member of the array resulting in a single output value.
Example
new Vue({
el: '#app',
data() {
return {
dataArray:
}
},
computed: {
bucket () {
return this.dataArray.reduce((obj, item) => {
if (!obj.hasOwnProperty(item.index)) {
Object.assign(obj, {
[item.index]: [item]
})
} else {
obj[item.index].push(item)
}
return obj
}, {})
}
},
created() {
for (i = 0; i < 10; i++) {
this.addData()
}
},
methods: {
addData() {
this.dataArray.push({
index: Math.ceil(Math.random() * 3),
name: Math.random().toString(36).substring(7)
})
},
removeData() {
this.dataArray = this.dataArray.slice(1)
}
}
})<div id="app">
<button @click="addData(true)">Add Data</button>
<button @click="removeData">Remove Data</button>
<div v-for="key in Object.keys(bucket)" :key="key">
<h3 style="font-family: monospace">Bucket {{ key }} ({{ bucket[key].length }} items)</h3>
<p v-for="(item, index) in bucket[key]" :key="item.name" style="font-family: monospace; border-bottom: 1px solid rgba(96,125,139,.1)">{{ index + 1 }}. {{ item.name }}</p>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.17/dist/vue.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vue-template-compiler@2.5.17/browser.min.js"></script></script>answered Nov 22 '18 at 22:25
DigitalDrifterDigitalDrifter
8,1652523
Well I have no idea what that does and how it works. But in that approach you can't dynamically add more data for the array, right? Or even dynamically increase the size the div "list"
– Myntekt
Nov 22 '18 at 22:29
You sure can. Computed properties react to changes in the underlying data (iethis.bigArrayOfData)
– Phil
Nov 22 '18 at 22:35
@Myntekt I've updated the answer to demonstrate Phil's comment.
– DigitalDrifter
Nov 23 '18 at 2:57
add a comment |
I would use reduce to create a "bucket" object keyed by the grouping indexes.
The reduce() method executes a reducer function (that you provide) on each member of the array resulting in a single output value.
Example
new Vue({
el: '#app',
data() {
return {
dataArray:
}
},
computed: {
bucket () {
return this.dataArray.reduce((obj, item) => {
if (!obj.hasOwnProperty(item.index)) {
Object.assign(obj, {
[item.index]: [item]
})
} else {
obj[item.index].push(item)
}
return obj
}, {})
}
},
created() {
for (i = 0; i < 10; i++) {
this.addData()
}
},
methods: {
addData() {
this.dataArray.push({
index: Math.ceil(Math.random() * 3),
name: Math.random().toString(36).substring(7)
})
},
removeData() {
this.dataArray = this.dataArray.slice(1)
}
}
})<div id="app">
<button @click="addData(true)">Add Data</button>
<button @click="removeData">Remove Data</button>
<div v-for="key in Object.keys(bucket)" :key="key">
<h3 style="font-family: monospace">Bucket {{ key }} ({{ bucket[key].length }} items)</h3>
<p v-for="(item, index) in bucket[key]" :key="item.name" style="font-family: monospace; border-bottom: 1px solid rgba(96,125,139,.1)">{{ index + 1 }}. {{ item.name }}</p>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.17/dist/vue.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vue-template-compiler@2.5.17/browser.min.js"></script></script>answered Nov 22 '18 at 22:25
DigitalDrifterDigitalDrifter
8,1652523
I would use reduce to create a "bucket" object keyed by the grouping indexes.
The reduce() method executes a reducer function (that you provide) on each member of the array resulting in a single output value.
Example
new Vue({
el: '#app',
data() {
return {
dataArray:
}
},
computed: {
bucket () {
return this.dataArray.reduce((obj, item) => {
if (!obj.hasOwnProperty(item.index)) {
Object.assign(obj, {
[item.index]: [item]
})
} else {
obj[item.index].push(item)
}
return obj
}, {})
}
},
created() {
for (i = 0; i < 10; i++) {
this.addData()
}
},
methods: {
addData() {
this.dataArray.push({
index: Math.ceil(Math.random() * 3),
name: Math.random().toString(36).substring(7)
})
},
removeData() {
this.dataArray = this.dataArray.slice(1)
}
}
})<div id="app">
<button @click="addData(true)">Add Data</button>
<button @click="removeData">Remove Data</button>
<div v-for="key in Object.keys(bucket)" :key="key">
<h3 style="font-family: monospace">Bucket {{ key }} ({{ bucket[key].length }} items)</h3>
<p v-for="(item, index) in bucket[key]" :key="item.name" style="font-family: monospace; border-bottom: 1px solid rgba(96,125,139,.1)">{{ index + 1 }}. {{ item.name }}</p>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.17/dist/vue.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vue-template-compiler@2.5.17/browser.min.js"></script></script>new Vue({
el: '#app',
data() {
return {
dataArray:
}
},
computed: {
bucket () {
return this.dataArray.reduce((obj, item) => {
if (!obj.hasOwnProperty(item.index)) {
Object.assign(obj, {
[item.index]: [item]
})
} else {
obj[item.index].push(item)
}
return obj
}, {})
}
},
created() {
for (i = 0; i < 10; i++) {
this.addData()
}
},
methods: {
addData() {
this.dataArray.push({
index: Math.ceil(Math.random() * 3),
name: Math.random().toString(36).substring(7)
})
},
removeData() {
this.dataArray = this.dataArray.slice(1)
}
}
})<div id="app">
<button @click="addData(true)">Add Data</button>
<button @click="removeData">Remove Data</button>
<div v-for="key in Object.keys(bucket)" :key="key">
<h3 style="font-family: monospace">Bucket {{ key }} ({{ bucket[key].length }} items)</h3>
<p v-for="(item, index) in bucket[key]" :key="item.name" style="font-family: monospace; border-bottom: 1px solid rgba(96,125,139,.1)">{{ index + 1 }}. {{ item.name }}</p>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.17/dist/vue.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vue-template-compiler@2.5.17/browser.min.js"></script></script>new Vue({
el: '#app',
data() {
return {
dataArray:
}
},
computed: {
bucket () {
return this.dataArray.reduce((obj, item) => {
if (!obj.hasOwnProperty(item.index)) {
Object.assign(obj, {
[item.index]: [item]
})
} else {
obj[item.index].push(item)
}
return obj
}, {})
}
},
created() {
for (i = 0; i < 10; i++) {
this.addData()
}
},
methods: {
addData() {
this.dataArray.push({
index: Math.ceil(Math.random() * 3),
name: Math.random().toString(36).substring(7)
})
},
removeData() {
this.dataArray = this.dataArray.slice(1)
}
}
})<div id="app">
<button @click="addData(true)">Add Data</button>
<button @click="removeData">Remove Data</button>
<div v-for="key in Object.keys(bucket)" :key="key">
<h3 style="font-family: monospace">Bucket {{ key }} ({{ bucket[key].length }} items)</h3>
<p v-for="(item, index) in bucket[key]" :key="item.name" style="font-family: monospace; border-bottom: 1px solid rgba(96,125,139,.1)">{{ index + 1 }}. {{ item.name }}</p>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.17/dist/vue.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vue-template-compiler@2.5.17/browser.min.js"></script></script>answered Nov 22 '18 at 22:25
DigitalDrifterDigitalDrifter
8,1652523
edited Nov 23 '18 at 3:08
answered Nov 22 '18 at 22:25
DigitalDrifterDigitalDrifter
8,1652523
answered Nov 22 '18 at 22:25
DigitalDrifterDigitalDrifter
8,1652523
answered Nov 22 '18 at 22:25
DigitalDrifterDigitalDrifter
8,1652523
8,1652523
Well I have no idea what that does and how it works. But in that approach you can't dynamically add more data for the array, right? Or even dynamically increase the size the div "list"
– Myntekt
Nov 22 '18 at 22:29
You sure can. Computed properties react to changes in the underlying data (iethis.bigArrayOfData)
– Phil
Nov 22 '18 at 22:35
@Myntekt I've updated the answer to demonstrate Phil's comment.
– DigitalDrifter
Nov 23 '18 at 2:57
add a comment |
Well I have no idea what that does and how it works. But in that approach you can't dynamically add more data for the array, right? Or even dynamically increase the size the div "list"
– Myntekt
Nov 22 '18 at 22:29
You sure can. Computed properties react to changes in the underlying data (iethis.bigArrayOfData)
– Phil
Nov 22 '18 at 22:35
@Myntekt I've updated the answer to demonstrate Phil's comment.
– DigitalDrifter
Nov 23 '18 at 2:57
Well I have no idea what that does and how it works. But in that approach you can't dynamically add more data for the array, right? Or even dynamically increase the size the div "list"
– Myntekt
Nov 22 '18 at 22:29
Well I have no idea what that does and how it works. But in that approach you can't dynamically add more data for the array, right? Or even dynamically increase the size the div "list"
– Myntekt
Nov 22 '18 at 22:29
You sure can. Computed properties react to changes in the underlying data (ie
this.bigArrayOfData)– Phil
Nov 22 '18 at 22:35
You sure can. Computed properties react to changes in the underlying data (ie
this.bigArrayOfData)– Phil
Nov 22 '18 at 22:35
@Myntekt I've updated the answer to demonstrate Phil's comment.
– DigitalDrifter
Nov 23 '18 at 2:57
@Myntekt I've updated the answer to demonstrate Phil's comment.
– DigitalDrifter
Nov 23 '18 at 2:57
add a comment |
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could you share a tried code?
– Boussadjra Brahim
Nov 22 '18 at 22:22
I haven't really tried because I only know what the non optimal solution to this would be. I actually have no idea if my idea is possible. Maybe I should do it in another way
– Myntekt
Nov 22 '18 at 22:23