Javascript loading CSV file into an array

Question

I am developing a web page in Wordpress  The webpage needs to have a combobox with all counties  I have a dataset in csv format which has some 10k rows for all these counties  When the user selects a county in the dropdown  I want only the selected county data displayed in the web page  This is my requirement   In wordpress  my web page I am adding the js file using    lt script type  text javascript  src  http   xxx wp     content uploads 2014 05 countyList1 js  gt  lt  script gt    and the code for webpage dropdown is    lt select name  county  id  county  onload  setCounties     onchange  getSelectedCountyData     gt  lt  select gt    In countyList1 js file I have the setCounties   and getSelectedCountyData   functions   So far I can see the dropdown with counties list  I don t know how to read the CSV file and apply the selected county filter to this list   I tried the FileReader object and I can load the CSV contents on the web page but I don t want the user to select the CSV  I have the dataset already    I am trying to use this jquery csv-0 71 library from this SO post How to read data From   CSV file using javascript  but I need help   Here s the code which gets called when a county is selected  function getSelectedCountyData             cntrySel   document getElementById  county              selCty   countyList cntrySel value           handleFiles       function handleFiles            document  ready function                ajax               type   GET               url   D  Docs Desktop csvfile csv               dataType   csv               success  function  data    processData data                            function processData allText        var allTextLines   allText split   r n  n        var headers   allTextLines 0  split           var lines            for  var i   1  i  lt  allTextLines length  i              var data   allTextLines i  split               if  data length    headers length                 var tarr                   for  var j   0  j  lt  headers length  j                      tarr push headers j          data j                              lines push tarr                       console log lines       drawOutput lines      function drawOutput lines          Clear previous data     document getElementById  output   innerHTML           var table   document createElement  table        for  var i   0  i  lt  lines length  i              var row   table insertRow -1           for  var j   0  j  lt  lines i  length  j                  var firstNameCell   row insertCell -1               firstNameCell appendChild document createTextNode lines i  j                         document getElementById  output   appendChild table

User · Answer

The original code works fine for reading and separating the csv file data but you need to change the data type from csv to text

User · Answer

You can t use AJAX to fetch files from the user machine  This is absolutely the wrong way to go about it   Use the FileReader API    lt input type  file  id  file input  gt    js   console log document getElementById  file input   files      list of File objects  var file   document getElementById  file input   files 0   var reader   new FileReader    content   reader readAsText file   console log content     Then parse content as CSV  Keep in mind that your parser currently does not deal with escaped values in CSV like  value1 value2  value 3   value   4

User · Answer

This is what I used to use a csv file into an array   Couldn t get the above answers to work  but this worked for me     document  ready function         use strict         ajax           type   GET           url      files icd10List csv           dataType   text           success  function data   processData data                  function processData icd10Codes         use strict       var input     csv toArrays icd10Codes           test   append input       Used the jQuery-CSV Plug-in linked above

User · Answer

I highly recommend looking into this plugin   http   github com evanplaice jquery-csv    I used this for a project handling large CSV files and it handles parsing a CSV into an array quite well   You can use this to call a local file that you specify in your code  also  so you are not dependent on a file upload     Once you include the plugin above  you can essentially parse the CSV using the following      ajax       url   pathto filename csv       async  false      success  function  csvd            data     csv toArrays csvd              dataType   text       complete  function                 call a function on complete              Everything will then live in the array data for you to manipulate as you need   I can provide further examples for handling the array data if you need   There are a lot of great examples available on the plugin page to do a variety of things  too

User · Answer

If your not overly worried about the size of the file then it may be easier for you to store the data as a JS object in another file and import it in your   Either synchronously or asynchronously using the syntax  lt script src  countries js  async gt  lt  script gt   Saves on you needing to import the file and parse it    However  i can see why you wouldnt want to rewrite 10000 entries so here s a basic object orientated csv parser i wrote   function requestCSV f c  return new CSVAJAX f c     function CSVAJAX filepath callback        this request   new XMLHttpRequest        this request timeout   10000      this request open  GET   filepath  true       this request parent   this      this callback   callback      this request onload   function                  var d   this response split   n      1st separator           var i   d length          while i--                        if d i                          d i    d i  split         2nd separator               else                 d splice i 1                     this parent response   d          if typeof this parent callback      undefined               this parent callback d              this request send         Which can be used like this   var foo   requestCSV  csvfile csv  drawlines lines       The first parameter is the file  relative to the position of your html file in this case  The second parameter is an optional callback function the runs when the file has been completely loaded   If your file has non-separating commmas then it wont get on with this  as it just creates 2d arrays by chopping at returns and commas  You might want to look into regexp if you need that functionality     THIS works    1234   ABCD   n          n    Gives you         1234     ABCD                           This DOESN T    12 34   AB CD   n           n    Gives you           12      34        AB      CD                                If your not used to the OO methods  they create a new object  like a number  string  array  with their own local functions and variables via a  constructor  function  Very handy in certain situations  This function could be used to load 10 different files with different callbacks all at the same time depending on your level of csv love

[javascript] Javascript loading CSV file into an array

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