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Raymond Osier
Raymond Osier
16,581 Points

How to read and sort a text file with JavaScript

I am working on a project and I am a little stuck on the best way to solve this problem.

I need to build an application that will import into memory a text file with tabbed delimiters of collected data then I need to search threw the file for specific data once that data is found I need to place it into Either ( array, object, or database) a container that i can easily call for a calculation functions. than display the results to the screen and offer option to export to excel format. I originally planned to do this in c# witch is my first language but i am running into trouble sorting threw the data in c# as well , I want to see witch language will be better suited for this task.

1 Answer

From what you've wrote, it sounds like you need AJAX and JASON. Are you pulling data from another source?

Raymond Osier
Raymond Osier
16,581 Points

no i am only pulling data from a local text file ( note this app will be bundled for desktop delpoyment ) . I am currently using the File API here is the start of my code.

if (window.File && window.FileReader && window.FileList && window.Blob){
    console.log('API IS A Go !!');
} else { 
   alert('API Is a NO GO!!');
//standard way to select a file in JavaScript
var files = evt.target.files;
function OpenFile(evt){
     // file list object
    // files is a  Fileset of file objects. list some properties
    var output =[];
    for (var i =0, f; f= files[i]; i++){
        output.push('<li><strong>', escape(f.name),'</strong> (' f.type || 'n/a'.')-',f.size,'bytes, last modified: ', f.lastModifiedDate ?f.lastModifiedDate.toLocaleDateString() : 'n/a','</li>');
    document.getElementById('list').innerHTML = '<ul>' + output.join('') + '</ul>';
document.getElementById('files').addEventListener('change' , handleFileSelect,false);

function SortFile(){
        var reader = new FileReader();
        reader.onloadend = function(e){
            var txtArea = document.createElement('textarea');
            txtArea.value = this.result;
    }, errorHandler);

}, errorHandler);