过滤表多列

Question

我在我的页面上使用了w3School代码并且它工作正常,但它只过滤了一列,不知道如何创建循环但跳跃有更容易的解决方案.

    td = tr[i].getElementsByTagName("td")[0];     

改变这里0到1改变列,可以找到任何东西,所以尝试了许多不同的东西但不是程序员不知道是否有任何其他属性允许多列,花了这么多搜索,请帮助

function myFunction() {
  var input, filter, table, tr, td, i;
  input = document.getElementById("myInput");
  filter = input.value.toUpperCase();
  table = document.getElementById("myTable");
  tr = table.getElementsByTagName("tr");
  for (i = 0; i < tr.length; i++) {
    td = tr[i].getElementsByTagName("td")[0];
    if (td) {
      if (td.innerHTML.toUpperCase().indexOf(filter) > -1) {
        tr[i].style.display = "";
      } else {
        tr[i].style.display = "none";
      }
    }
  }
}

* {
  box-sizing: border-box;
}

#myInput {
  background-image: url('/css/searchicon.png');
  background-position: 10px 10px;
  background-repeat: no-repeat;
  width: 100%;
  font-size: 16px;
  padding: 12px 20px 12px 40px;
  border: 1px solid #ddd;
  margin-bottom: 12px;
}

#myTable {
  border-collapse: collapse;
  width: 100%;
  border: 1px solid #ddd;
  font-size: 18px;
}

#myTable th,
#myTable td {
  text-align: left;
  padding: 12px;
}

#myTable tr {
  border-bottom: 1px solid #ddd;
}

#myTable tr.header,
#myTable tr:hover {
  background-color: #f1f1f1;
}

<h2>My Customers</h2>

<input type="text" id="myInput" onkeyup="myFunction()" placeholder="Search             for names.." title="Type in a name">

<table id="myTable">
  <tr class="header">
    <th style="width:60%;">Name</th>
    <th style="width:40%;">Country</th>
  </tr>
  <tr>
    <td>Alfreds Futterkiste</td>
    <td>Germany</td>
  </tr>
  <tr>
    <td>Berglunds snabbkop</td>
    <td>Sweden</td>
  </tr>
  <tr>
    <td>Island Trading</td>
    <td>UK</td>
  </tr>
  <tr>
    <td>Koniglich Essen</td>
    <td>Germany</td>
  </tr>
  <tr>
    <td>Laughing Bacchus Winecellars</td>
    <td>Canada</td>
  </tr>
  <tr>
    <td>Magazzini Alimentari Riuniti</td>
    <td>Italy</td>
  </tr>
  <tr>
    <td>North/South</td>
    <td>UK</td>
  </tr>
  <tr>
    <td>Paris specialites</td>
    <td>France</td>
  </tr>
</table>

Answer 1

有显著更好的网络比W3学校的资源,你真的应该避免网站海事组织.话虽这么说,如果你想匹配整行,你只需要看一下tr而不是其中一个td:

function myFunction() {
    var input = document.getElementById("myInput");
    var filter = input.value.toUpperCase();
    var table = document.getElementById("myTable");
    var tr = table.getElementsByTagName("tr");
    for (var i = 0; i < tr.length; i++) {
        if (tr.textContent.toUpperCase().indexOf(filter) > -1) {
            tr[i].style.display = "";
        } else {
            tr[i].style.display = "none";
        }      
    }
}

如果要过滤多个列而不是整行,只需||在条件中使用OR():

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";
        }      
    }
}

本教程不太好的一些原因:你应该避免使用,innerHTML而应该使用,textContent因为你的单元格可能有HTML,用户可以在尝试搜索可见文本时键入标记名称,并对匹配的内容感到困惑.您应该为您的函数命名,以指明它们的作用(例如,filterTable而不是myFunction).此外,还有更简单的方法来访问表数据(例如tr.cells).如果添加keyup事件侦听器,#myInput则每次调用该函数时都不需要查找该DOM节点.这是一个例子:

function filterTable(event) {
    var filter = event.target.value.toUpperCase();
    var rows = document.querySelector("#myTable tbody").rows;
    
    for (var i = 0; i < rows.length; i++) {
        var firstCol = rows[i].cells[0].textContent.toUpperCase();
        var secondCol = rows[i].cells[1].textContent.toUpperCase();
        if (firstCol.indexOf(filter) > -1 || secondCol.indexOf(filter) > -1) {
            rows[i].style.display = "";
        } else {
            rows[i].style.display = "none";
        }      
    }
}

document.querySelector('#myInput').addEventListener('keyup', filterTable, false);

<input id="myInput" type="text" />
<table id="myTable">
 <thead>
  <tr class="header">
    <th style="width:60%;">Name</th>
    <th style="width:40%;">Country</th>
  </tr>
 </thead>
 <tbody>
  <tr>
    <td>Alfreds Futterkiste</td>
    <td>Germany</td>
  </tr>
  <tr>
    <td>Berglunds snabbkop</td>
    <td>Sweden</td>
  </tr>
  <tr>
    <td>Island Trading</td>
    <td>UK</td>
  </tr>
  <tr>
    <td>Koniglich Essen</td>
    <td>Germany</td>
  </tr>
  <tr>
    <td>Laughing Bacchus Winecellars</td>
    <td>Canada</td>
  </tr>
  <tr>
    <td>Magazzini Alimentari Riuniti</td>
    <td>Italy</td>
  </tr>
  <tr>
    <td>North/South</td>
    <td>UK</td>
  </tr>
  <tr>
    <td>Paris specialites</td>
    <td>France</td>
  </tr>
 </tbody>
</table>