按选择过滤表：列，条件和值js

Question

我想通过列，条件和用户输入的值实时过滤表格，我在js中为零，我正在使用django和postgres。表保存在 postgres 中。

模板

<form action="" method="get" class="inline">

        <select name="column" class="form-control">
            <option value="" selected disabled>Choose field</option>
            <option value="title">Title</option>
            <option value="quantity">Quantity</option>
            <option value="distance">Distance</option>
        </select>

        <label for="table">Condition</label>

        <select name="condition" class="form-control">
            <option value="" selected disabled>Choose condition</option>
            <option value="greater">greater</option>
            <option value="contains">contains</option>
            <option value="lower">lower</option>
            <option value="equals">equals</option>
        </select>

        <input class="form-control" type="text" placeholder="search" id="search-text" onkeyup="tableSearch()">

        <button type="submit">Apply</button>
</form>

非常感谢您的帮助）

可以吗？

function myFunction() {
    var input = document.getElementById("myInput");
    var filter = input.value.toUpperCase();
    var table = document.getElementById("myTable");
    var tr = table.getElementsByTagName("tr");
    var tds = tr.getElementsByTagName('td');

    for (var i = 0; i < tr.length; i++) {
        var firstCol = tds[0].textContent.toUpperCase();
        var secondCol = tds[1].textContent.toUpperCase();
        if (firstCol.indexOf(filter) > -1 || secondCol.indexOf(filter) > -1) {
            tr[i].style.display = "";
        } else {
            tr[i].style.display = "none";
        }      
    }
}

Answer 1

你试过array.filter()方法吗？

const data = [
  { title: 'spray', quantity: 40, distance: 300 },
  { title: 'pray', quantity: 10, distance: 150 },
  { title: 'grey', quantity: 23, distance: 100 }
];
const result = data.filter(each => each[quantity] < 23 );
console.log(result);
// expected output: Array [{ title: 'pray', quantity: 10, distance: 150 }]

您也可以使用eval 并动态更改条件。

Answer 2

如果您使用的是 vue.js，请尝试以下 sn-p：

new Vue({
  el: '#demo',
  data() {
    return {
      products: [
        {title: 'pro 1', qty: 7, dist: 234},
        {title: 'apro 1', qty: 3, dist: 456},
        {title: 'cpro 1', qty: 2, dist: 231},
        {title: 'bpro 1', qty: 8, dist: 145},
        {title: 'upro 1', qty: 4, dist: 768},
      ],
      conditions: ['greater', 'contains', 'lower', 'equals'],
      selField: '',
      selCond: '',
      value: '',
      filteredProds: []
    }
  },
  computed: {
    formFields() {
      const fields = []
      for(const key in this.products[0]) {
        let temp = this.products[0][key]
        let type = typeof temp
        fields.push([key, type])
      }
      return fields
    },
  },
  methods: {
    filterProd() {
      if (this.selField !== '' && this.selCond !== '' && this.value !== '') {
        if (this.selField[1] === 'number') {
          this.filteredProds = this.products.filter(p => {
            if(this.selCond === 'equals') {
              return p[this.selField[0]] === Number(this.value)
            } else if(this.selCond === 'greater') {
              return p[this.selField[0]] > Number(this.value)
            } else if(this.selCond === 'lower') {
              return p[this.selField[0]] < Number(this.value)
            }
          })
        } else {
          this.filteredProds = this.products.filter(p => {
            if(this.selCond === 'contains') {
              return p[this.selField[0]].includes(this.value)
            }
          })
        }
      }
      this.selField = ''
      this.selCond = ''
      this.value = ''
    },
    clearFilters() {
      this.filteredProds = this.products
    }
  },
  mounted() {
    this.filteredProds = this.products
  }
})

ul {
  list-style: none;
  width: 300px;
}
li, .header {
  display: flex;
  justify-content: space-between;
}
.header {
  font-weight: 600;
  background: lightblue;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
<div id="demo">
  <form action="" method="get" class="inline">
    <select name="column" class="form-control" v-model="selField">
      <option value="" selected disabled>Choose field</option>
      <option v-for="(field, i) in formFields" :key="i" :value="field">{{ field[0] }}</option>
    </select>
    <label for="table">Condition</label>
    <select name="condition" class="form-control" v-model="selCond">
      <option value="" selected disabled>Choose condition</option>
      <option v-for="(cond, i) in conditions" :key="i">{{ cond }}</option>
    </select>
    <input class="form-control" type="text" placeholder="search" id="search-text" v-model="value">
    <button type="submit" @click.prevent="filterProd">Apply</button>
    <button type="submit" @click.prevent="clearFilters">All</button>
  </form>
  <ul class="header">
    <li v-for="(field, i) in formFields" :key="i">
      {{ field[0] }}
    </li>
  </ul>
  <ul>
    <li v-for="(prod, i) in filteredProds" :key="i">
      <p>{{ prod.title }}</p>
      <p>{{ prod.qty }}</p>
      <p>{{ prod.dist }}</p>
    </li>
  </ul>
</div>