How to set the table in vue to grow longer as the content increases

As one of the popular frameworks in front-end development, Vue.js is very suitable for quickly creating dynamic, interactive web applications. Among them, the need to display data in tables is very common, but how to make tables more flexible as the content increases is also a topic worth discussing.

In Vue.js, we can use many different ways to set the table to grow longer as the content increases, including using dynamic styles, using calculated properties, and monitoring data changes. Next, this article will introduce the specific implementation and usage scenarios of these methods in detail.

1. Use dynamic styles

A common way to make the table grow longer with the content is to use dynamic styles. The specific implementation method is to wrap a container div outside the table, and then set the height of the container div in the Vue component according to the height of the table and changes in content, so as to achieve the effect of the table growing longer with the content.

The following is a simple example:

<template>
  <div class="table-wrapper">
    <table>
      <thead>
        <tr>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
        </tr>
      </thead>
      <tbody>
        <tr v-for="(item, index) in list" :key="index">
          <td>{{ item.name }}</td>
          <td>{{ item.age }}</td>
          <td>{{ item.gender }}</td>
        </tr>
      </tbody>
    </table>
  </div>
</template>

<script>
export default {
  data() {
    return {
      list: [
        { name: "张三", age: 20, gender: "男" },
        { name: "李四", age: 22, gender: "女" },
        { name: "王五", age: 18, gender: "男" }
      ]
    };
  },
  mounted() {
    this.computeTableHeight();
  },
  methods: {
    computeTableHeight() {
      const table = document.querySelector(".table-wrapper table");
      const wrapper = document.querySelector(".table-wrapper");
      const height = table.clientHeight;
      wrapper.style.height = `${height}px`;
    }
  }
};
</script>

<style>
.table-wrapper {
  overflow-y: auto;
  max-height: 400px;
}
</style>

In the above example, we wrap a container .table-wrapper outside the table, and set the container's The maximum height is 400px. In the mounted hook function of the Vue component, we calculate the height of the table and set the height of the container to make the table grow longer as the content increases.

It should be noted that using this method needs to avoid excessive calculations, otherwise it may reduce the performance of the page.

2. Use calculated properties

Another way to make the table grow longer with the content is to use calculated properties. This method is usually suitable for scenarios where table data changes frequently. By dynamically calculating the height of the table, the table can grow longer with the content.

The following is an example (assuming that the data in the list will change dynamically):

<template>
  <div class="table-wrapper" :style="{ height: tableHeight + 'px' }">
    <table>
      <thead>
        <tr>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
        </tr>
      </thead>
      <tbody>
        <tr v-for="(item, index) in list" :key="index">
          <td>{{ item.name }}</td>
          <td>{{ item.age }}</td>
          <td>{{ item.gender }}</td>
        </tr>
      </tbody>
    </table>
  </div>
</template>

<script>
export default {
  data() {
    return {
      list: [
        { name: "张三", age: 20, gender: "男" },
        { name: "李四", age: 22, gender: "女" },
        { name: "王五", age: 18, gender: "男" }
      ]
    };
  },
  computed: {
    tableHeight() {
      const table = document.querySelector(".table-wrapper table");
      const height = table ? table.clientHeight : 0;
      return height;
    }
  }
};
</script>

<style>
.table-wrapper {
  overflow-y: auto;
  max-height: 400px;
}
</style>

In the above example, we use the calculated property tableHeight to dynamically calculate the table height, and then use :style="{ height: tableHeight 'px' }" in the style of the container div to bind the calculated property to make the table grow longer with the content.

It should be noted that when using this method, you need to ensure that the amount of calculation of the calculated attributes is reasonable to avoid excessive calculations that lead to page performance degradation.

3. Monitor data changes

The last way to make the table grow longer with the content is to monitor data changes. Specifically, it monitors changes in the list array, and then recalculates the height of the table when the data changes, so that the table becomes longer as the content increases.

The following is an example:

<template>
  <div class="table-wrapper" :style="{ height: tableHeight + 'px' }">
    <table>
      <thead>
        <tr>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
        </tr>
      </thead>
      <tbody>
        <tr v-for="(item, index) in list" :key="index">
          <td>{{ item.name }}</td>
          <td>{{ item.age }}</td>
          <td>{{ item.gender }}</td>
        </tr>
      </tbody>
    </table>
  </div>
</template>

<script>
export default {
  data() {
    return {
      list: [
        { name: "张三", age: 20, gender: "男" },
        { name: "李四", age: 22, gender: "女" },
        { name: "王五", age: 18, gender: "男" }
      ]
    };
  },
  computed: {
    tableHeight() {
      const table = document.querySelector(".table-wrapper table");
      const height = table ? table.clientHeight : 0;
      return height;
    }
  },
  watch: {
    list() {
      this.$nextTick(() => {
        this.computeTableHeight();
      });
    }
  },
  mounted() {
    this.computeTableHeight();
  },
  methods: {
    computeTableHeight() {
      const table = document.querySelector(".table-wrapper table");
      const wrapper = document.querySelector(".table-wrapper");
      const height = table.clientHeight;
      wrapper.style.height = `${height}px`;
    }
  }
};
</script>

<style>
.table-wrapper {
  overflow-y: auto;
  max-height: 400px;
}
</style>

In this example, we listen for changes in the list array, then recalculate the height of the table when the data changes, and set the height of the container to achieve The effect of the table growing longer with the content.

The advantage of this method is that it is relatively direct and does not require too much calculation. However, it is also necessary to consider that when the amount of data is too large, it will have a certain impact on performance.

To sum up, the above are three ways to make the table grow longer as the content increases. Which method should be chosen according to the actual situation and needs. No matter which method is used, the purpose is to make the page more flexible, easy to use, beautiful and efficient.

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