Question

我做了一个货币转换器并且我将所有货币汇率放在.xlsx（excel文件）中，数据正在更新并自动保存，因此我无法将其保存为.csv并将数据解析到脚本中。我需要知道如何直接从excel获取数据到JavaScript（我只能在javascript中理解，所以如果你使用其他语言，我会很高兴，如果你发送完整的代码）。

这是网站本身：

header 
{
    position: fixed;
    width: 100%;
    top: 0;
    background-image: url(../images/banner-1103703_960_720.jpg);
    box-shadow: 0 0 4px grey;
}

body
{
margin: 0px;
background-color: #6eaac4;
}

#converter
{
padding-top: 230px;
text-align: center;

}
#logo
{
max-width: 340px;
}

#to
{
    font-size: 40px;
    color: firebrick;
    font-family:fantasy;
}

select
{
    width: 300px;
    height: 50px;
    line-height: 50px;
    border-radius: 15px;
    background-color:lightblue;
    font-size: 20px;
}

article
{
    background-color: chartreuse;
       border-radius: 50px;
    border-color: black;
    width: 340px;
    height: auto;
}

button
{
     /* Green */
     background-color:whitesmoke;
    background-repeat:no-repeat;
    border: 4px;
    cursor:pointer;
    overflow: hidden;
    border-radius: 30px;
    outline:none;
    color: firebrick;
    text-align: center;
    font-family: fantasy;
    letter-spacing: 5px;
    text-decoration: none;
    font-size: 50px;
}

input
{
    background-color: lightblue;
    border-radius: 15px;
    width: 200px;
    height: 50px;
    line-height: 50px;
    border-width: 1px;
    font-size: 20px;
    text-align: center;
    
    
}

iframe
{
    display: none;
}

<!DOCTYPE html>
<html manifest="offline.manifest">
<head>
<meta name="viewport" content="width=device-width" />
<link rel="stylesheet" href="design/style.css">
<link rel="icon" href="images/icon.ico">
<title>Vertycon</title>
    <script src="jquery-3.1.0.min.js" ></script>
</head>
<body onload="">
<header> 
<center><a href="index.html">
<img id="logo" src="images/LOGO.png" height="170px" width="340px">
</a></center> </header>
    <div id="converter">
       <center> <article><br>
           <input type="number" name="amount" placeholder="Amount" id="amount"/>
           <br><br>
           <select id="From">
            <option value="Display">Convert From..</option>
            <option value="US Dollar">US Dollar</option>  
            <option value="ARS"> Argentine Peso</option>
            <option value="AUD">Australian Dollar</option>
            <option value="BHD">Bahraini Dinar</option>
            <option value="BWP">Botswana Pula</option>
            <option value="BRL">Brazilian Real</option>
            <option value="BND">Bruneian Dollar</option>
            <option value="BGN">Bulgarian Lev</option>
            <option value="CAD">Canadian Dollar</option>
            <option value="CLP">Chilean Peso</option>
            <option value="CNY">Chinese Yuan Renminbi</option>
            <option value="COP">Colombian Peso</option>
            <option value="HRK">Croatian Kuna</option>
            <option value="CZK">Czech Koruna</option>
            <option value="DKK">Danish Krone</option>
            <option value="EUR">Euro</option>
            <option value="HKD">Hong Kong Dollar</option>
            <option value="HUF">Hungarian Forint</option>
            <option value="ISK">Icelandic Krona</option>
            <option value="INR">Indian Rupee</option>
            <option value="IDR">Indonesian Rupiah</option>
            <option value="IRR">Iranian Rial</option>
            <option value="ILS">Israeli Shekel</option>
            <option value="JPY">Japanese Yen</option>
            <option value="KZT">Kazakhstani Tenge</option>
            <option value="KRW">South Korean Won</option>
            <option value="KWD">Kuwaiti Dinar</option>
            <option value="LYD">Libyan Dinar</option>
            <option value="MYR">Malaysian Ringgit</option>
            <option value="MUR">Mauritian Rupee</option>
            <option value="MXN">Mexican Peso</option>
            <option value="NPR">Nepalese Rupee</option>
            <option value="NZD">New Zealand Dollar</option>
            <option value="NOK">Norwegian Krone</option>
            <option value="OMR">Omani Rial</option>
            <option value="PKR">Pakistani Rupee</option>
            <option value="JPY">Philippine Peso</option>
            <option value="PLN">Polish Zloty</option>
            <option value="QAR">Qatari Riyal</option>
            <option value="RON">Romanian New Leu</option>
            <option value="RUB">Russian Ruble</option>
            <option value="SAR">Saudi Arabian Riyal</option>
            <option value="SGD">Singapore Dollar</option>
            <option value="ZAR">South African Rand</option>
            <option value="LKR">Sri Lankan Rupee</option>
            <option value="SEK">Swedish Krona</option>
            <option value="CHF">Swiss Franc</option>
            <option value="TWD">Taiwan New Dollar</option>
            <option value="THB">Thai Baht</option>
            <option value="TTD">Trinidadian Dollar</option>
            <option value="TRY">Turkish Lira</option>
            <option value="AED">Emirati Dirham</option>
            <option value="GBP">British Pound</option>
            <option value="VEF">Venezuelan Bolivar</option>
                   </select>
        <div id="to"> &nbsp;To&nbsp;</div> 
     <select id="To">
            <option value="Display">Convert To..</option>
            <option value="USD">US Dollar</option>  
            <option value="ARS"> Argentine Peso</option>
            <option value="AUD">Australian Dollar</option>
            <option value="BHD">Bahraini Dinar</option>
            <option value="BWP">Botswana Pula</option>
            <option value="BRL">Brazilian Real</option>
            <option value="BND">Bruneian Dollar</option>
            <option value="BGN">Bulgarian Lev</option>
            <option value="CAD">Canadian Dollar</option>
            <option value="CLP">Chilean Peso</option>
            <option value="CNY">Chinese Yuan Renminbi</option>
            <option value="COP">Colombian Peso</option>
            <option value="HRK">Croatian Kuna</option>
            <option value="CZK">Czech Koruna</option>
            <option value="DKK">Danish Krone</option>
            <option value="EUR">Euro</option>
            <option value="HKD">Hong Kong Dollar</option>
            <option value="HUF">Hungarian Forint</option>
            <option value="ISK">Icelandic Krona</option>
            <option value="INR">Indian Rupee</option>
            <option value="IDR">Indonesian Rupiah</option>
            <option value="IRR">Iranian Rial</option>
            <option value="ILS">Israeli Shekel</option>
            <option value="JPY">Japanese Yen</option>
            <option value="KZT">Kazakhstani Tenge</option>
            <option value="KRW">South Korean Won</option>
            <option value="KWD">Kuwaiti Dinar</option>
            <option value="LYD">Libyan Dinar</option>
            <option value="MYR">Malaysian Ringgit</option>
            <option value="MUR">Mauritian Rupee</option>
            <option value="MXN">Mexican Peso</option>
            <option value="NPR">Nepalese Rupee</option>
            <option value="NZD">New Zealand Dollar</option>
            <option value="NOK">Norwegian Krone</option>
            <option value="OMR">Omani Rial</option>
            <option value="PKR">Pakistani Rupee</option>
            <option value="JPY">Philippine Peso</option>
            <option value="PLN">Polish Zloty</option>
            <option value="QAR">Qatari Riyal</option>
            <option value="RON">Romanian New Leu</option>
            <option value="RUB">Russian Ruble</option>
            <option value="SAR">Saudi Arabian Riyal</option>
            <option value="SGD">Singapore Dollar</option>
            <option value="ZAR">South African Rand</option>
            <option value="LKR">Sri Lankan Rupee</option>
            <option value="SEK">Swedish Krona</option>
            <option value="CHF">Swiss Franc</option>
            <option value="TWD">Taiwan New Dollar</option>
            <option value="THB">Thai Baht</option>
            <option value="TTD">Trinidadian Dollar</option>
            <option value="TRY">Turkish Lira</option>
            <option value="AED">Emirati Dirham</option>
            <option value="GBP">British Pound</option>
            <option value="VEF">Venezuelan Bolivar</option>
        </select>
        <br>
        <br>
        <button type="submit" id="submit" onclick="Vars; Alert();">Convert!</button>
        <br>
        <br>
        <br>
        <br>
            </article></center>
    </div>
    <iframe src="https://onedrive.live.com/embed?cid=BE27105A8171337A&resid=BE27105A8171337A%211291&authkey=ALjfySLkSxTD7MU&em=2" width="402" height="346" frameborder="0" scrolling="no" id="ifrm"></iframe>
   
    <script>
function Vars(){
 var select1 = document.getElementById('From');
  var From = (select1.options[select.selectedIndex]);
  var select2 = document.getElementById('To');
  var To = (select2.options[select.selectedIndex]);
}
        function Alert(){
            alert(From.value+To.value)
            alert(document.getElementById('amount').value)
        }
    </script>
   
    

</body>
</html>

这是excel文件：

the excel file

先谢谢了，爱你们的人

Answer 1

有许多库可以实现这一目标。我用过公司的那个是SheetJS。

编辑：添加一个例子。这是实用程序函数的精简版本，它接受一个文件和一组属性，以将excel表中的数据解析为更可用的形式。

var REGEX = { 'regexExcel': /^.+\.(xlsx?)$/i, 'regexExcelWithOds: /^.+\.((?:xlsx?)|(?:ods))$/i };

/**
 * Converts an excel column letter (e.g. R, AZ) to an associated integer
 * value so that it can be used as an iterator
 **/
function excelColumnToInt (index)
{
  var multiplier = 1, value = 0;

  for (var iterator = (index.length - 1); iterator >= 0; iterator--)
  {
    if (multiplier === 1)
    {
      //'A' is 65 in ASCII. It equates to 0 for our purposes.
      value += (index.charCodeAt (iterator) - 65);
    }
    else
    {
      value += (index.charCodeAt (iterator) - 64) * multiplier;
    }

    multiplier *= 26;
  }

  return value;
}

/**
 * Retrieves the letter of the column associated with the given field name
 **/
function excelGetColumnForProperty (worksheet, fieldName, bounds)
{
  var column;

  for (var count = bounds[0].c; count <= bounds[1].c; count++)
  {
    column = excelIntToColumn(count);

    try
    {
      if (worksheet[column + bounds[0].r].v.trim ().toLowerCase () === fieldName.toLowerCase ())
      {
        return column;
      }
    }
    catch (exception)
    {
      continue;
    }
  }

  return null;
}

/**
 * Validates a given excel document against its given fields, then feeds the
 * result to the given callback function
 **/
function importFromExcel (filepicker, properties, callback)
{
  var processing = true;

  var files = $(filepicker)[0].files;

  if (!files.length)
  {
    //Raise error notification here

    processing = false;

    return;
  }

  if (!properties || !properties.length)
  {
    processing = false;

    return;
  }

  var errorMessage;
  var errorList = [], itemSet = [];
  var workbook, extensionCheck;
  var reader = new FileReader ();

  //Handler is created before iterating through the files
  reader.onload = function (event)
  {
    try
    {
      switch (extensionCheck[1])
      {
        case 'xls':
          workbook = XLS.read (event.target.result, {type: 'binary'});

          break;
        case 'ods':
          //NOTE: Has some issues with parsing sparse sheets
          workbook = XLSX.read (event.target.result, {type: 'binary'});

          break;
        default:
          workbook = XLSX.read (event.target.result, {type: 'binary'});
      }
    }
    catch (exception)
    {
      //Raise error notification here

      processing = false;

      return;
    }

    var sheet, ref, bounds, tmp, count, match;

    workbook.SheetNames.forEach (function (sheetname, sheetIndex)
    {
      sheet = workbook.Sheets[sheetname];

      //Skip empty worksheets
      if (!sheet['!ref']) { return; }

      //Format: A1:ZZ99
      ref = sheet['!ref'].split (':');
      bounds = [];

      //Low bound
      tmp = ref[0].match (/^([A-Z]+)([0-9]+)$/);
      bounds[0] = {c: excelColumnToInt (tmp[1]), r: parseInt(tmp[2])};

      //High bound
      tmp = ref[1].match (/^([A-Z]+)([0-9]+)$/);
      bounds[1] = {c: excelColumnToInt (tmp[1]), r: parseInt(tmp[2])};

      //Cycle through the last row. If content is not found, reduce the
      //bound and try the next row up
      var checkingBounds = true;

      while (checkingBounds)
      {
        for (count = 0; count < bounds[1].c; count++)
        {
          try
          {
            if (!!sheet[excelIntToColumn (count) + bounds[1].r].w)
            {
              checkingBounds = false;
              bounds[1].r++;
              break;
            }
          }
          catch (exception)
          {
            //Fail silently
          }
        }

        bounds[1].r--;
      }

      //Find the column associated with each property
      properties.forEach (function (property, propertyIndex)
      {
        property.column = excelGetColumnForProperty (sheet, property.name, bounds);

        //Column with the given name not found
        if (!property.column)
        {
          errorList.push ('Could not find a column corresponding to <strong>' + property.name + '</strong> on <strong>' + sheetname + '</strong>');
        }
      });

      if (!!errorList.length) { return; }

      //Retrieve product data
      var itemObj;
      var rowValid = true;

      for (count = (bounds[0].r + 1); count <= bounds[1].r; count++)
      {
        itemObj = {};
        rowValid = true;

        properties.forEach (function (property, propertyIndex)
        {
          try
          {
            if (property.required && sheet[property.column + count] === undefined)
            {
              throw 'Required property missing';
            }

            //Define custom handlers based on expected inputs
            switch (property.handler)
            {
              case 'myHandler':

                break;
              default:
                itemObj[property.field] = sheet[property.column + count].v;
            }
          }
          catch (exception)
          {
            //Guard in case the flattened sheet is missing an index associated with an optional value
            if (exception === 'Required property missing' && property.required)
            {
              errorList.push ('Could not find a value for <strong>' + property.name + '</strong> on <strong>' + sheetname + '</strong> at <strong>row ' + count + '</strong>. This is a required field.');
              rowValid = false;
            }
          }
        });

        if (rowValid)
        {
          itemSet.push (itemObj);
        }
      }
    });

    if (!!errorList.length)
    {
      errorMessage = '<p>The system encountered issues when trying to read your file. Please fix these problems before proceeding.</p><ul>';

      errorList.forEach (function (error, index)
      {
        errorMessage += '<li>' + error + '</li>';
      });

      errorMessage += '</ul>';

      //Notify user of the errors you encountered here

      processing = false;
    }
    else
    {
      callback (itemSet);
    }
  };

  var count, file;

  //Note: Only one file is supported at this time, but the structure
  //      for handling multiple files is the same. Support for multiple
  //      files results in a fairly complicated synchronization model.
  for (count = 0; count < files.length; count++)
  {
    file = files[count];

    extensionCheck = file.name.match (REGEX.regexExcel);

    if (!extensionCheck)
    {
      //ODS files don't seem to parse correctly
      errorList.push ('The file ' + file.name + ' is invalid. Please provide a .xls or a .xlsx file.');

      continue;
    }

    reader.readAsBinaryString (file);
  }

  if (!!errorList.length)
  {
    errorMessage = '<p>The system encountered issues when trying to read your file. Please fix these problems before proceeding.</p><ul>';

    errorList.forEach (function (error, index)
    {
      errorMessage += '<li>' + error + '</li>';
    });

    errorMessage += '</ul>';

    //Notify user of parsing errors here

    processing = false;
  }
}

使用示例：

importFromExcel ('#myFilePicker',
                 [
                   {field: 'name', name: 'Name', handler: 'assignment', required: true},
                   {field: 'is_taxed', name: 'Taxable (Y/N)', handler: 'boolean', required: false}
                 ],
                 function (results)
                 {
                   //Handle the response here
                 });

试图从excel获取信息到JS

1 个答案: