javascript – Filereader读取为readAsArrayBuffer时使用正确的编码读取文件

我正在阅读使用javaScript上传的.csv / xlsx文件,并将结果作为包含每行的数组.我能够使用FileReader和SheetJs读取文件并使用以下代码获取数据.

// code for the new excel reader
$scope.do_file =  function(files)
{
    $scope.fileContent  = [];
    var X = XLSX;
    var global_wb;
    var f = files[0];
    var reader = new FileReader();
    reader.onload = function(e)
    {
        var data = e.target.result;console.log(data);
        global_wb = X.read(data, {type: 'array'});
        var output = "";
        var result = {};
        global_wb.SheetNames.forEach(function(sheetName) {
            var roa = X.utils.sheet_to_json(global_wb.Sheets[sheetName], {header:1});
            if(roa.length) result[sheetName] = roa;
        });
        $scope.fileContent =  result["Sheet1"];
        if(!result["Sheet1"])
        {
            $scope.fileContent =  result["contacts"].filter(function(el) { return typeof el != "object" || Array.isArray(el) || Object.keys(el).length > 0; });
        }
    };
    reader.readAsArrayBuffer(f);
};

对于阅读代码工作的大多数文件,但是当包含带有Windows-1255编码的希伯来文本的文件时,我会得到乱码数据.

寻找更多选项我试图使用reader.readAsText将文件作为文本读取并根据需要更改编码,请检查以下代码：

function is_Hebrew(data)
{
    var position = data.search(/[\u0590-\u05FF]/);
    return position >= 0;
}

 $scope.do_file =  function(files)
 {
    var fullResult = [];
    var file =files[0];
      var reader = new FileReader();
        reader.onload = function(e){
            var data = e.target.result;
                if(!is_Hebrew(data.toString()))
                {
                  reader.readAsText(file,'ISO-8859-8');   
                }
            };
        reader.readAsText(file);
        reader.onloadend = function(){
            var lines = reader.result.split('\r\n');
            console.log(lines);
            lines.forEach(element => {
                var cell = element.split(',');
                fullResult.push(cell);
            });

             console.log(reader);
        };
    };

但是上面的代码不合适,因为它不会读取文件,因为每行标识每个单元格.如果任何一个单元格包含具有逗号分隔值的字符串(例如,如果单元格包含字符串值,例如“25,28,29”),则数组输出会将每个值视为每个单元格时提供错误的数据.

所以我决定坚持使用第一种方法,但我无法改变编码.是否有可能在第一个代码中更改编码,我使用readAsArrayBuffer来读取文件数据？

解决方法:

经过大量可能的解决方案后,我发现上述问题的答案是结合上述两种方法.第一种读取xlsx文件的方法和第二种读取csv文件的方法.此外,我在第二种方法中使用了另一个名为papaparse的javaScript库来解决每个单元格中读取数据的问题

$scope.is_Hebrew = function($data){
var position = $data.search(/[\u0590-\u05FF]/);
return position >= 0;
}

// code for the new excel reader
$scope.do_file =  function(files)
{
    var config = {
    delimiter: "",  // auto-detect
    newline: "",    // auto-detect
    quoteChar: '"',
    escapeChar: '"',
    header: false,
    trimHeader: false,
    dynamicTyping: false,
    preview: 0,
    encoding: "",
    worker: false,
    comments: false,
    step: undefined,
    complete: undefined,
    error: undefined,
    download: false,
    skipEmptyLines: false,
    chunk: undefined,
    fastMode: undefined,
    beforeFirstChunk: undefined,
    withCredentials: undefined
    };

    $scope.fileContent  = [];
    var f = files[0];
    var fileExtension = f.name.replace(/^.*\./, '');
    if(fileExtension == 'xlsx')
    {
        var X = XLSX;
        var global_wb;
        var reader = new FileReader();
        reader.onload = function(e)
        {
            var data = e.target.result;
            global_wb = X.read(data, {type: 'array'});
            var result = {};
            global_wb.SheetNames.forEach(function(sheetName) {
               var roa = X.utils.sheet_to_json(global_wb.Sheets[sheetName], {header:1});
               if(roa.length) result[sheetName] = roa;
            });
            $scope.fileContent =  result["Sheet1"];
            if(!result["Sheet1"])
            {
               $scope.fileContent =  result["contacts"].filter(function(el) { return typeof el != "object" || Array.isArray(el) || Object.keys(el).length > 0; });
            }

        };
        reader.readAsArrayBuffer(f);

    }
    else if(fileExtension == 'csv')
    {
    var reader = new FileReader();
    reader.onload = function(e)
    {
        var data = e.target.result;
        console.log(f);
        console.log($scope.is_Hebrew(data.toString()));
        if(!$scope.is_Hebrew(data.toString()))
        {
           reader.readAsText(f,'ISO-8859-8');   
        }
    };

    reader.readAsText(f);
    reader.onloadend = function(e){
        var c =  Papa.parse(reader.result,[ config])
        console.log(c);
        $scope.fileContent =  c["data"].filter(function(el) { return typeof el != "object" || Array.isArray(el) || Object.keys(el).length > 0; });

    };

    }
    else
    {
       alert("File Not supported!");
    }

$scope.fileContent.push([]);
};

标签：javascript,angularjs,encoding,csv,sheetjs
来源： https://codeday.me/bug/20190929/1830338.html