Question

我有一张大表，其中包含行号和价格。我希望能够通过使用行号查找价格。

function buildtable(){

   var tableObj = document.getElementById( 'table' );

   var allTRs = tableObj.getElementsByTagName( 'tr' );
   for ( var trCounter = 0; trCounter < allTRs.length; trCounter++ )
   {
     var tmpArr = [];
     var allTDsInTR = allTRs[ trCounter ].getElementsByTagName( 'td' );
     for ( var tdCounter = 0; tdCounter < allTDsInTR.length - 1; tdCounter++ )
     {
       tmpArr.push( allTDsInTR[ tdCounter ].innerHTML );
     }
     arr.push( tmpArr );

  }

}

以下代码创建一个列表列表。

如何更改功能，以便其创建单个密钥对存储？

HTML FOR TABLE

foreach（$ res as $ row）{

  $seat = $row['RowNumber'];  
  $price = $row['Zone.PriceMultiplier * 15.00'];

   echo "<tr>";
   echo "<td>".$seat."</td>";
   echo "<td>".$price."</td>";
   echo "<td><input type='checkbox' name='check_list[]' value=\"$seat;\" onclick='javatest(this);' </td>";
   echo "</tr>";


}

Answer 1

您可以将一个对象用作键值映射（哈希表）。

function buildtable() {
    var tableObj = document.getElementById('table');
    var map = {};
    var allTRs = tableObj.getElementsByTagName('tr');
    for (var trCounter = 1; trCounter < allTRs.length; trCounter++) {
        var tmpArr = [];
        var allTDsInTR = allTRs[trCounter].getElementsByTagName('td');
    
        if (allTDsInTR.length) {
           map[allTDsInTR[0].innerHTML.trim()] = parseFloat(allTDsInTR[1].innerHTML.trim());
        }
    }
    
    console.log(map);

}

buildtable();

<table id='table'>
    <thead>
    <tr>
        <td>
            RowNumber
        </td>
        <td>
            Price
        </td>
    <tr>
    </thead>
    <tbody>
    <tr>
        <td>
            U01
        </td>
        <td>
            24.5
        </td>
    <tr>
    <tr>
        <td>
            U02
        </td>
        <td>
            22
        </td>
    <tr>
    </tbody>
</table>

结果将类似于：

{
  "U01": 24.5,
  "U02": 22
}

Answer 2

像这样吗？

var tableRows = Array.from(document.querySelectorAll('#myTable > tbody > tr'));
var result = {};
tableRows.forEach(row => {
  var cols = Array.from(row.getElementsByTagName('td'));
  var key = cols[0].innerHTML;
  var value = cols[1].innerHTML;
  if (!result[key]) {
    result[key] = [value];
  } else {
    result[key].push(value);
  }
});
console.log(result);

<table id="myTable">
  <thead>
    <tr>
      <th>RowNumber</th>
      <th>Price</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>U01</td>
      <td>26.999999284744263</td>
    </tr>
    <tr>
      <td>U02</td>
      <td>26.999999284744263</td>
    </tr>
    <tr>
      <td>U01</td>
      <td>26.999999284744263</td>
    </tr>
  </tbody>
</table>

使用普通的JS

2 个答案: