Tips for effectively utilizing v-if, v-else within a v-for loop in your Vuejs application

Question

Tips for effectively utilizing v-if, v-else within a v-for loop in your Vuejs application

<template>
  <div>
    <div v-for="box in boxes" :key="box.id">
      <BaseAccordian>
        <template v-slot:title>{{ box.name }}</template>
        <template v-slot:content>
          <div v-for="paint in paints" :key="paint.id" class="line">
            <div
              v-if="
                matchingdata.some(
                  (m) => m.boxid == box.boxid && m.paintid == paint.paintid
                )
              "
            >
              <StatusComponent
                :box="box"
                :paint="paint"
                :matchingdata="matchingdata"
              />
            </div>
            <!-- <div v-else>no data found</div> -->
          </div>
        </template>
      </BaseAccordian>
    </div>
  </div>
</template>

When a checkbox is clicked, relevant data from the box and paint array is loaded by checking in the matching data array.

I would like to display a message saying "no data found" if no data is found when a checkbox is clicked.

The issue with the current code is that only a few data is displayed when the v-if is placed at the top and v-for and v-else data at the bottom.

javascript vue.js

Answer 1

Answer №1

Employ `matchingdata.some()` once more

To enhance your code, consider using matchingdata.some() within a v-if statement above the v-for loop to verify if any of the paints are present. Include a v-else at the end for alternative content.

Here is the corrected section:

<template>
  <div>
    <div v-for="box in boxes" :key="box.id">
      <BaseAccordian>
        <template v-slot:title>{{ box.name }}</template>
        <template v-slot:content>
          <template v-if="
              matchingdata.some(
                (m) => m.boxid == box.boxid && paints.find( (paint) => m.paintid == paint.paintid )
              )
            "
          >
            <div v-for="paint in paints" :key="paint.id" class="line">
              <div
                v-if="
                  matchingdata.some(
                    (m) => m.boxid == box.boxid && m.paintid == paint.paintid
                  )
                "
              >
                <StatusComponent
                  :box="box"
                  :paint="paint"
                  :matchingdata="matchingdata"
                />
              </div>
            </div>
          </template>
          <div v-else>no data found</div>
        </template>
      </BaseAccordian>
    </div>
  </div>
</template>

After inserting this code to your sandbox, the message now displays only once per box.

The key part involves pre-checking all paints using paints.find:

matchingdata.some(
  (m) => m.boxid == box.boxid && paints.find( (paint) => m.paintid == paint.paintid )
)

For additional information, refer to:

Answer 2

Employ `matchingdata.some()` once more

To enhance your code, consider using matchingdata.some() within a v-if statement above the v-for loop to verify if any of the paints are present. Include a v-else at the end for alternative content.

Here is the corrected section:

<template>
  <div>
    <div v-for="box in boxes" :key="box.id">
      <BaseAccordian>
        <template v-slot:title>{{ box.name }}</template>
        <template v-slot:content>
          <template v-if="
              matchingdata.some(
                (m) => m.boxid == box.boxid && paints.find( (paint) => m.paintid == paint.paintid )
              )
            "
          >
            <div v-for="paint in paints" :key="paint.id" class="line">
              <div
                v-if="
                  matchingdata.some(
                    (m) => m.boxid == box.boxid && m.paintid == paint.paintid
                  )
                "
              >
                <StatusComponent
                  :box="box"
                  :paint="paint"
                  :matchingdata="matchingdata"
                />
              </div>
            </div>
          </template>
          <div v-else>no data found</div>
        </template>
      </BaseAccordian>
    </div>
  </div>
</template>

After inserting this code to your sandbox, the message now displays only once per box.

The key part involves pre-checking all paints using paints.find:

matchingdata.some(
  (m) => m.boxid == box.boxid && paints.find( (paint) => m.paintid == paint.paintid )
)

For additional information, refer to:

Answer 3

Answer №2

When using the v-for directive, each 'box' in the 'boxes' array will be rendered individually. Within each box, you should have a structure like this:

<BaseAccordian>
  <template v-slot:title>{{ box.name }}</template>
  <template v-slot:content>
    <div v-for="paint in paints" :key="paint.id" class="line">
 {...}
    </div>
  </template>
</BaseAccordian>

For every paint in the paints array, there will be a corresponding div rendered for each paint within every box.

The v-if, v-else-if, and v-else directives will conditionally render their blocks based on the conditions provided in them. In the example given, it checks for the existence of an element in the array matchingdata with properties boxid and paintid matching the box.boxid and paint.paintid respectively. If the condition is met, the associated div will be rendered; otherwise, the 'v-else' div will be rendered if it's uncommented.

The code iterates through each box in the boxes array, and for each box, it iterates through each paint in the paints array to find an object in matchingdata with a structure like:

{
  boxid: ...,
  paintid: ...,
  ...,
}

It's important to note that the v-for and v-if/v-else-if/v-else blocks are independent of each other. The v-for directive handles looping over items, while the conditional directives control which elements are displayed based on specified conditions.

In order for v-if, v-else-if, and v-else to be part of the same logical block, they must appear consecutively in that order.

Answer 4

When using the v-for directive, each 'box' in the 'boxes' array will be rendered individually. Within each box, you should have a structure like this:

<BaseAccordian>
  <template v-slot:title>{{ box.name }}</template>
  <template v-slot:content>
    <div v-for="paint in paints" :key="paint.id" class="line">
 {...}
    </div>
  </template>
</BaseAccordian>

For every paint in the paints array, there will be a corresponding div rendered for each paint within every box.

The v-if, v-else-if, and v-else directives will conditionally render their blocks based on the conditions provided in them. In the example given, it checks for the existence of an element in the array matchingdata with properties boxid and paintid matching the box.boxid and paint.paintid respectively. If the condition is met, the associated div will be rendered; otherwise, the 'v-else' div will be rendered if it's uncommented.

The code iterates through each box in the boxes array, and for each box, it iterates through each paint in the paints array to find an object in matchingdata with a structure like:

{
  boxid: ...,
  paintid: ...,
  ...,
}

It's important to note that the v-for and v-if/v-else-if/v-else blocks are independent of each other. The v-for directive handles looping over items, while the conditional directives control which elements are displayed based on specified conditions.

In order for v-if, v-else-if, and v-else to be part of the same logical block, they must appear consecutively in that order.

Tips for effectively utilizing v-if, v-else within a v-for loop in your Vuejs application

Answer №1

Employ `matchingdata.some()` once more

Answer №2

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Tips for effectively utilizing v-if, v-else within a v-for loop in your Vuejs application

Answer №1

Employ matchingdata.some() once more

Answer №2

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Employ `matchingdata.some()` once more