How to read content of text file as Javascript? - javascript

I want to write a function in javascript that reads text file and if it contains any javascript function in that text file then instead of reading it just as text, my function will read it as javascript.
Like:
const toBeRead = () => true; //This function is in text file
Above function is in text file and I want to read it as javascript. Currently I am reading this as a string but wanted to take output from it which is true.
Editing for better demonstration. Here is my function after using eval()
function readSingleFile(evt) {
var f = evt.target.files[0];
if (f) {
var r = new FileReader();
r.onload = function (e) {
var contents = e.target.result;
var ct = r.result;
var words = ct.split("\n");
let array = [];
words.map((word) => {
if (word.substring(0, 6) === "const ") {
if (word.includes("=>")) {
if (word.includes("=")) {
alert(word); //It shows const toBeRead=()=>true;
alert(eval(word)); // It shows undefined
array.push(word);
}
}
}
return array;
});
alert(array);
};
r.readAsText(f);
} else {
alert("Failed to load file");
}
}
Actually I am creating a rule for coding convention like if functions return boolean then it should start with "is/has". Like const isFuncTrue=()=>true; Don't have rule defined in Eslint!

Two methods
eval(jsstr) - not recommended
script:
Example in browser - will not run if no DOM
const str = `const toBeRead = () => true; //This function is in text file`
const scr = document.createElement("script")
scr.textContent = str;
document.body.appendChild(scr)
console.log(toBeRead())

Related

Split a Javascript string by comma, but ignore commas that would be inside a string [duplicate]

My CSV data looks like this:
heading1,heading2,heading3,heading4,heading5
value1_1,value2_1,value3_1,value4_1,value5_1
value1_2,value2_2,value3_2,value4_2,value5_2
...
How do you read this data and convert to an array like this using JavaScript?:
[
heading1: value1_1,
heading2: value2_1,
heading3: value3_1,
heading4: value4_1
heading5: value5_1
],[
heading1: value1_2,
heading2: value2_2,
heading3: value3_2,
heading4: value4_2,
heading5: value5_2
]
....
I've tried this code but no luck!:
<script type="text/javascript">
var allText =[];
var allTextLines = [];
var Lines = [];
var txtFile = new XMLHttpRequest();
txtFile.open("GET", "file://d:/data.txt", true);
txtFile.onreadystatechange = function()
{
allText = txtFile.responseText;
allTextLines = allText.split(/\r\n|\n/);
};
document.write(allTextLines);
document.write(allText);
document.write(txtFile);
</script>
No need to write your own...
The jQuery-CSV library has a function called $.csv.toObjects(csv) that does the mapping automatically.
Note: The library is designed to handle any CSV data that is RFC 4180 compliant, including all of the nasty edge cases that most 'simple' solutions overlook.
Like #Blazemonger already stated, first you need to add line breaks to make the data valid CSV.
Using the following dataset:
heading1,heading2,heading3,heading4,heading5
value1_1,value2_1,value3_1,value4_1,value5_1
value1_2,value2_2,value3_2,value4_2,value5_2
Use the code:
var data = $.csv.toObjects(csv):
The output saved in 'data' will be:
[
{ heading1:"value1_1",heading2:"value2_1",heading3:"value3_1",heading4:"value4_1",heading5:"value5_1" }
{ heading1:"value1_2",heading2:"value2_2",heading3:"value3_2",heading4:"value4_2",heading5:"value5_2" }
]
Note: Technically, the way you wrote the key-value mapping is invalid JavaScript. The objects containing the key-value pairs should be wrapped in brackets.
If you want to try it out for yourself, I suggest you take a look at the Basic Usage Demonstration under the 'toObjects()' tab.
Disclaimer: I'm the original author of jQuery-CSV.
Update:
Edited to use the dataset that the op provided and included a link to the demo where the data can be tested for validity.
Update2:
Due to the shuttering of Google Code. jquery-csv has moved to GitHub
NOTE: I concocted this solution before I was reminded about all the "special cases" that can occur in a valid CSV file, like escaped quotes. I'm leaving my answer for those who want something quick and dirty, but I recommend Evan's answer for accuracy.
This code will work when your data.txt file is one long string of comma-separated entries, with no newlines:
data.txt:
heading1,heading2,heading3,heading4,heading5,value1_1,...,value5_2
javascript:
$(document).ready(function() {
$.ajax({
type: "GET",
url: "data.txt",
dataType: "text",
success: function(data) {processData(data);}
});
});
function processData(allText) {
var record_num = 5; // or however many elements there are in each row
var allTextLines = allText.split(/\r\n|\n/);
var entries = allTextLines[0].split(',');
var lines = [];
var headings = entries.splice(0,record_num);
while (entries.length>0) {
var tarr = [];
for (var j=0; j<record_num; j++) {
tarr.push(headings[j]+":"+entries.shift());
}
lines.push(tarr);
}
// alert(lines);
}
The following code will work on a "true" CSV file with linebreaks between each set of records:
data.txt:
heading1,heading2,heading3,heading4,heading5
value1_1,value2_1,value3_1,value4_1,value5_1
value1_2,value2_2,value3_2,value4_2,value5_2
javascript:
$(document).ready(function() {
$.ajax({
type: "GET",
url: "data.txt",
dataType: "text",
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<allTextLines.length; i++) {
var data = allTextLines[i].split(',');
if (data.length == headers.length) {
var tarr = [];
for (var j=0; j<headers.length; j++) {
tarr.push(headers[j]+":"+data[j]);
}
lines.push(tarr);
}
}
// alert(lines);
}
http://jsfiddle.net/mblase75/dcqxr/
Don't split on commas -- it won't work for most CSV files, and this question has wayyyy too many views for the asker's kind of input data to apply to everyone. Parsing CSV is kind of scary since there's no truly official standard, and lots of delimited text writers don't consider edge cases.
This question is old, but I believe there's a better solution now that Papa Parse is available. It's a library I wrote, with help from contributors, that parses CSV text or files. It's the only JS library I know of that supports files gigabytes in size. It also handles malformed input gracefully.
1 GB file parsed in 1 minute:
(Update: With Papa Parse 4, the same file took only about 30 seconds in Firefox. Papa Parse 4 is now the fastest known CSV parser for the browser.)
Parsing text is very easy:
var data = Papa.parse(csvString);
Parsing files is also easy:
Papa.parse(file, {
complete: function(results) {
console.log(results);
}
});
Streaming files is similar (here's an example that streams a remote file):
Papa.parse("http://example.com/bigfoo.csv", {
download: true,
step: function(row) {
console.log("Row:", row.data);
},
complete: function() {
console.log("All done!");
}
});
If your web page locks up during parsing, Papa can use web workers to keep your web site reactive.
Papa can auto-detect delimiters and match values up with header columns, if a header row is present. It can also turn numeric values into actual number types. It appropriately parses line breaks and quotes and other weird situations, and even handles malformed input as robustly as possible. I've drawn on inspiration from existing libraries to make Papa, so props to other JS implementations.
I am using d3.js for parsing csv file. Very easy to use.
Here is the docs.
Steps:
npm install d3-request
Using Es6;
import { csv } from 'd3-request';
import url from 'path/to/data.csv';
csv(url, function(err, data) {
console.log(data);
})
Please see docs for more.
Update -
d3-request is deprecated. you can use d3-fetch
Here's a JavaScript function that parses CSV data, accounting for commas found inside quotes.
// Parse a CSV row, accounting for commas inside quotes
function parse(row){
var insideQuote = false,
entries = [],
entry = [];
row.split('').forEach(function (character) {
if(character === '"') {
insideQuote = !insideQuote;
} else {
if(character == "," && !insideQuote) {
entries.push(entry.join(''));
entry = [];
} else {
entry.push(character);
}
}
});
entries.push(entry.join(''));
return entries;
}
Example use of the function to parse a CSV file that looks like this:
"foo, the column",bar
2,3
"4, the value",5
into arrays:
// csv could contain the content read from a csv file
var csv = '"foo, the column",bar\n2,3\n"4, the value",5',
// Split the input into lines
lines = csv.split('\n'),
// Extract column names from the first line
columnNamesLine = lines[0],
columnNames = parse(columnNamesLine),
// Extract data from subsequent lines
dataLines = lines.slice(1),
data = dataLines.map(parse);
// Prints ["foo, the column","bar"]
console.log(JSON.stringify(columnNames));
// Prints [["2","3"],["4, the value","5"]]
console.log(JSON.stringify(data));
Here's how you can transform the data into objects, like D3's csv parser (which is a solid third party solution):
var dataObjects = data.map(function (arr) {
var dataObject = {};
columnNames.forEach(function(columnName, i){
dataObject[columnName] = arr[i];
});
return dataObject;
});
// Prints [{"foo":"2","bar":"3"},{"foo":"4","bar":"5"}]
console.log(JSON.stringify(dataObjects));
Here's a working fiddle of this code.
Enjoy! --Curran
You can use PapaParse to help.
https://www.papaparse.com/
Here is a CodePen.
https://codepen.io/sandro-wiggers/pen/VxrxNJ
Papa.parse(e, {
header:true,
before: function(file, inputElem){ console.log('Attempting to Parse...')},
error: function(err, file, inputElem, reason){ console.log(err); },
complete: function(results, file){ $.PAYLOAD = results; }
});
If you want to solve this without using Ajax, use the FileReader() Web API.
Example implementation:
Select .csv file
See output
function readSingleFile(e) {
var file = e.target.files[0];
if (!file) {
return;
}
var reader = new FileReader();
reader.onload = function(e) {
var contents = e.target.result;
displayContents(contents);
displayParsed(contents);
};
reader.readAsText(file);
}
function displayContents(contents) {
var element = document.getElementById('file-content');
element.textContent = contents;
}
function displayParsed(contents) {
const element = document.getElementById('file-parsed');
const json = contents.split(',');
element.textContent = JSON.stringify(json);
}
document.getElementById('file-input').addEventListener('change', readSingleFile, false);
<input type="file" id="file-input" />
<h3>Raw contents of the file:</h3>
<pre id="file-content">No data yet.</pre>
<h3>Parsed file contents:</h3>
<pre id="file-parsed">No data yet.</pre>
function CSVParse(csvFile)
{
this.rows = [];
var fieldRegEx = new RegExp('(?:\s*"((?:""|[^"])*)"\s*|\s*((?:""|[^",\r\n])*(?:""|[^"\s,\r\n]))?\s*)(,|[\r\n]+|$)', "g");
var row = [];
var currMatch = null;
while (currMatch = fieldRegEx.exec(this.csvFile))
{
row.push([currMatch[1], currMatch[2]].join('')); // concatenate with potential nulls
if (currMatch[3] != ',')
{
this.rows.push(row);
row = [];
}
if (currMatch[3].length == 0)
break;
}
}
I like to have the regex do as much as possible. This regex treats all items as either quoted or unquoted, followed by either a column delimiter, or a row delimiter. Or the end of text.
Which is why that last condition -- without it it would be an infinite loop since the pattern can match a zero length field (totally valid in csv). But since $ is a zero length assertion, it won't progress to a non match and end the loop.
And FYI, I had to make the second alternative exclude quotes surrounding the value; seems like it was executing before the first alternative on my javascript engine and considering the quotes as part of the unquoted value. I won't ask -- just got it to work.
Per the accepted answer,
I got this to work by changing the 1 to a 0 here:
for (var i=1; i<allTextLines.length; i++) {
changed to
for (var i=0; i<allTextLines.length; i++) {
It will compute the a file with one continuous line as having an allTextLines.length of 1. So if the loop starts at 1 and runs as long as it's less than 1, it never runs. Hence the blank alert box.
$(function() {
$("#upload").bind("click", function() {
var regex = /^([a-zA-Z0-9\s_\\.\-:])+(.csv|.xlsx)$/;
if (regex.test($("#fileUpload").val().toLowerCase())) {
if (typeof(FileReader) != "undefined") {
var reader = new FileReader();
reader.onload = function(e) {
var customers = new Array();
var rows = e.target.result.split("\r\n");
for (var i = 0; i < rows.length - 1; i++) {
var cells = rows[i].split(",");
if (cells[0] == "" || cells[0] == undefined) {
var s = customers[customers.length - 1];
s.Ord.push(cells[2]);
} else {
var dt = customers.find(x => x.Number === cells[0]);
if (dt == undefined) {
if (cells.length > 1) {
var customer = {};
customer.Number = cells[0];
customer.Name = cells[1];
customer.Ord = new Array();
customer.Ord.push(cells[2]);
customer.Point_ID = cells[3];
customer.Point_Name = cells[4];
customer.Point_Type = cells[5];
customer.Set_ORD = cells[6];
customers.push(customer);
}
} else {
var dtt = dt;
dtt.Ord.push(cells[2]);
}
}
}
Actually you can use a light-weight library called any-text.
install dependencies
npm i -D any-text
use custom command to read files
var reader = require('any-text');
reader.getText(`path-to-file`).then(function (data) {
console.log(data);
});
or use async-await :
var reader = require('any-text');
const chai = require('chai');
const expect = chai.expect;
describe('file reader checks', () => {
it('check csv file content', async () => {
expect(
await reader.getText(`${process.cwd()}/test/files/dummy.csv`)
).to.contains('Lorem ipsum');
});
});
This is an old question and in 2022 there are many ways to achieve this. First, I think D3 is one of the best alternatives for data manipulation. It's open sourced and free to use, but also it's modular so we can import just the fetch module.
Here is a basic example. We will use the legacy mode so I will import the entire D3 library. Now, let's call d3.csv function and it's done. This function internally calls the fetch method therefore, it can open dataURL, url, files, blob, and so on.
const fileInput = document.getElementById('csv')
const outElement = document.getElementById('out')
const previewCSVData = async dataurl => {
const d = await d3.csv(dataurl)
console.log({
d
})
outElement.textContent = d.columns
}
const readFile = e => {
const file = fileInput.files[0]
const reader = new FileReader()
reader.onload = () => {
const dataUrl = reader.result;
previewCSVData(dataUrl)
}
reader.readAsDataURL(file)
}
fileInput.onchange = readFile
<script type="text/javascript" src="https://unpkg.com/d3#7.6.1/dist/d3.min.js"></script>
<div>
<p>Select local CSV File:</p>
<input id="csv" type="file" accept=".csv">
</div>
<pre id="out"><p>File headers will appear here</p></pre>
If we don't want to use any library and we just want to use pain JavaScrip (Vanilla JS) and we managed to get the text content of a file as data and we don't want to use d3 we can implement a simple function that will split the data into a text array then we will extract the first line and split into a headers array and the rest of the text will be the lines we will process. After, we map each line and extract its values and create a row object from an array created from mapping each header to its correspondent value from values[index].
NOTE:
We also we going to use a little trick array objects in JavaScript can also have attributes. Yes so we will define an attribute rows.headers and assign the headers to it.
const data = `heading_1,heading_2,heading_3,heading_4,heading_5
value_1_1,value_2_1,value_3_1,value_4_1,value_5_1
value_1_2,value_2_2,value_3_2,value_4_2,value_5_2
value_1_3,value_2_3,value_3_3,value_4_3,value_5_3`
const csvParser = data => {
const text = data.split(/\r\n|\n/)
const [first, ...lines] = text
const headers = first.split(',')
const rows = []
rows.headers = headers
lines.map(line => {
const values = line.split(',')
const row = Object.fromEntries(headers.map((header, i) => [header, values[i]]))
rows.push(row)
})
return rows
}
const d = csvParser(data)
// Accessing to the theaders attribute
const headers = d.headers
console.log({headers})
console.log({d})
Finally, let's implement a vanilla JS file loader using fetch and parsing the csv file.
const fetchFile = async dataURL => {
return await fetch(dataURL).then(response => response.text())
}
const csvParser = data => {
const text = data.split(/\r\n|\n/)
const [first, ...lines] = text
const headers = first.split(',')
const rows = []
rows.headers = headers
lines.map(line => {
const values = line.split(',')
const row = Object.fromEntries(headers.map((header, i) => [header, values[i]]))
rows.push(row)
})
return rows
}
const fileInput = document.getElementById('csv')
const outElement = document.getElementById('out')
const previewCSVData = async dataURL => {
const data = await fetchFile(dataURL)
const d = csvParser(data)
console.log({ d })
outElement.textContent = d.headers
}
const readFile = e => {
const file = fileInput.files[0]
const reader = new FileReader()
reader.onload = () => {
const dataURL = reader.result;
previewCSVData(dataURL)
}
reader.readAsDataURL(file)
}
fileInput.onchange = readFile
<script type="text/javascript" src="https://unpkg.com/d3#7.6.1/dist/d3.min.js"></script>
<div>
<p>Select local CSV File:</p>
<input id="csv" type="file" accept=".csv">
</div>
<pre id="out"><p>File contents will appear here</p></pre>
I used this file to test it
Here is another way to read an external CSV into Javascript (using jQuery).
It's a little bit more long winded, but I feel by reading the data into arrays you can exactly follow the process and makes for easy troubleshooting.
Might help someone else.
The data file example:
Time,data1,data2,data2
08/11/2015 07:30:16,602,0.009,321
And here is the code:
$(document).ready(function() {
// AJAX in the data file
$.ajax({
type: "GET",
url: "data.csv",
dataType: "text",
success: function(data) {processData(data);}
});
// Let's process the data from the data file
function processData(data) {
var lines = data.split(/\r\n|\n/);
//Set up the data arrays
var time = [];
var data1 = [];
var data2 = [];
var data3 = [];
var headings = lines[0].split(','); // Splice up the first row to get the headings
for (var j=1; j<lines.length; j++) {
var values = lines[j].split(','); // Split up the comma seperated values
// We read the key,1st, 2nd and 3rd rows
time.push(values[0]); // Read in as string
// Recommended to read in as float, since we'll be doing some operations on this later.
data1.push(parseFloat(values[1]));
data2.push(parseFloat(values[2]));
data3.push(parseFloat(values[3]));
}
// For display
var x= 0;
console.log(headings[0]+" : "+time[x]+headings[1]+" : "+data1[x]+headings[2]+" : "+data2[x]+headings[4]+" : "+data2[x]);
}
})
Hope this helps someone in the future!
A bit late but I hope it helps someone.
Some time ago even I faced a problem where the string data contained \n in between and while reading the file it used to read as different lines.
Eg.
"Harry\nPotter","21","Gryffindor"
While-Reading:
Harry
Potter,21,Gryffindor
I had used a library csvtojson in my angular project to solve this problem.
You can read the CSV file as a string using the following code and then pass that string to the csvtojson library and it will give you a list of JSON.
Sample Code:
const csv = require('csvtojson');
if (files && files.length > 0) {
const file: File = files.item(0);
const reader: FileReader = new FileReader();
reader.readAsText(file);
reader.onload = (e) => {
const csvs: string = reader.result as string;
csv({
output: "json",
noheader: false
}).fromString(csvs)
.preFileLine((fileLine, idx) => {
//Convert csv header row to lowercase before parse csv file to json
if (idx === 0) { return fileLine.toLowerCase() }
return fileLine;
})
.then((result) => {
// list of json in result
});
}
}
I use the jquery-csv to do this.
and I provide two examples as below
async function ReadFile(file) {
return await file.text()
}
function removeExtraSpace(stringData) {
stringData = stringData.replace(/,( *)/gm, ",") // remove extra space
stringData = stringData.replace(/^ *| *$/gm, "") // remove space on the beginning and end.
return stringData
}
function simpleTest() {
let data = `Name, Age, msg
foo, 25, hello world
bar, 18, "!! 🐬 !!"
`
data = removeExtraSpace(data)
console.log(data)
const options = {
separator: ",", // default "," . (You may want to Tab "\t" or somethings.
delimiter: '"', // default "
headers: true // default true
}
// const myObj = $.csv.toObjects(data, options)
const myObj = $.csv.toObjects(data) // If you want to use default options, then you can omit them.
console.log(myObj)
}
window.onload = () => {
const inputFile = document.getElementById("uploadFile")
inputFile.onchange = () => {
const inputValue = inputFile.value
if (inputValue === "") {
return
}
const selectedFile = document.getElementById('uploadFile').files[0]
const promise = new Promise(resolve => {
const fileContent = ReadFile(selectedFile)
resolve(fileContent)
})
promise.then(fileContent => {
// Use promise to wait for the file reading to finish.
console.log(fileContent)
fileContent = removeExtraSpace(fileContent)
const myObj = $.csv.toObjects(fileContent)
console.log(myObj)
})
}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-csv/1.0.11/jquery.csv.min.js"></script>
<label for="uploadFile">Demo 1</label>
<input type="file" id="uploadFile" accept=".csv"/>
<button onclick="simpleTest()">Demo 2</button>
With this function csvToObjs you can transform data-entries from format CSV to an array of objects.
function csvToObjs(string) {
const lines = data.split(/\r\n|\n/);
let [headings, ...entries] = lines;
headings = headings.split(',');
const objs = [];
entries.map(entry=>{
obj = entry.split(',');
objs.push(Object.fromEntries(headings.map((head, i)=>[head, obj[i]])));
})
return objs;
}
data = `heading1,heading2,heading3,heading4,heading5
value1_1,value2_1,value3_1,value4_1,value5_1
value1_2,value2_2,value3_2,value4_2,value5_2`
console.log(csvToObjs(data));

Call variable value in another .js file

I have 2 soy.js and lib-dialogs.js files.
I need to make lib-dialogs pass the value of the lineCount variable to soy.js.
I was able to do this with localStorage but because it saves in a cookie it does not update the values correctly.
In lib-dialogs there is a function called BlocklyDialogs.congratulations that calls the necessary data.
FIle:lib-dialogs.js
BlocklyDialogs.congratulations = function() {
// Add the user's code.
if (BlocklyGames.workspace) {
var linesText = document.getElementById('dialogLinesText');
linesText.textContent = '';
// Line produces warning when compiling Puzzle since there is no JavaScript
// generator. But this function is never called in Puzzle, so no matter.
var code = Blockly.JavaScript.workspaceToCode(BlocklyGames.workspace);
code = BlocklyInterface.stripCode(code);
var noComments = code.replace(/\/\/[^\n]*/g, ''); // Inline comments.
noComments = noComments.replace(/\/\*.*\*\//g, ''); /* Block comments. */
noComments = noComments.replace(/[ \t]+\n/g, '\n'); // Trailing spaces.
noComments = noComments.replace(/\n+/g, '\n'); // Blank lines.
noComments = noComments.trim();
var lineCount = noComments.split('\n').length;
var pre = document.getElementById('containerCode');
pre.textContent = code;
if (typeof prettyPrintOne == 'function') {
code = pre.innerHTML;
code = prettyPrintOne(code, 'js');
pre.innerHTML = code;
}
if (lineCount == 1) {
var text = BlocklyGames.getMsg('Games_linesOfCode1');
} else {
var text = BlocklyGames.getMsg('Games_linesOfCode2')
.replace('%1', String(lineCount));
}
linesText.appendChild(document.createTextNode(text));
}
FIle:soy.js
example "var count = BlocklyDialogs.congratulations(lineCount);"
In soy.js I need to receive the values of lineCount. I've already managed to do this using localStorage but I needed to do something more direct.
In testing I verified that the problem is in the lineCount variable because it is not passing a value to any variable even within the file itself.
I created a variable outside the blocklyDialogs.congratulations function and entered a value of 5.
I called the variable in the soy.js file and got it normally.
I need to make the lineCount pass its value.
You can use event driven programming, pub-sub model.
class EventManager {
constructor(...listeners) {
this.listeners = listeners;
}
register(fn) {
const id = this.listeners.push(fn);
return () => {
this.listeners.splice(id - 1, 1);
};
}
emit(data) {
this.listeners.forEach(fn => fn(data));
}
}
const pushEvents = new EventManager();
// JS 1
const unsubscribe1 = pushEvents.register(x => {
console.log("event:", x);
});
pushEvents.register(x => {
console.log("event:", x);
});
// JS 2
pushEvents.emit("Tets data");
//Output
// event: Tets data
// event: Tets data
unsubscribe1();
pushEvents.emit("Tets data2");
//Output
// event: Tets data2
.as-console-row {color: red!important}

How to build Typescript code in JS using a function?

Trying to build typescript code in JS so i can display on UI for user to play with the code , is there a way to create this code as a typescript instead of text so it compile as well ? Any help here will be highly appreciated couldn't find any source related to this issue.
data contains interfaces
main.js
function buildTypescript(data) {
var _ref = window.activeOperation;
var modelData = getModelData(data);
var text = '';
text += "import {Api as IngenSDK} from '#SSDK'" + ';\n\n';
text += modelData;
text += 'app.Api.setConfig({\n "env": "SIT3"\n});\n\n';
text += _ref + '(' + JSON.stringify(SDKresult[_ref].request, null, 4) + ', function(result) {\n //Your code goes here \n debugger; \n console.log(result); \n});';
$('#request_method_TS').text(text);
}
function getModelData(data){
var activePath = window.activePath.toLowerCase();
var _interface;
$.each(data.children, function(id, item){
// item.name would be string like "#SDK/core/interface/member/Details";
var path = item.name.replace(/\"/g, "");
if (path.toLowerCase().includes(activePath)) {
console.log('OBJ', item);
_interface = createInterfaces(path,item.children);
}
});
return _interface;
}
function createInterfaces(path, data) {
const imports = data.map(d => d.name).join(', ');
return `import { ${imports} } from '${path}';\n\n`;
}
html
<pre id="request_method_TS" style="margin: 5px;"></pre>
You can create the Typescript as executable by doing something like -
const executableTypescript = new Function(typescriptDataAsText);
The typescript code in the string will already be compiled at this point.
To execute it, you just call the newly created function like -
executableTypescript();
Check by running the below snippet that the Typescript code of logging the message in the variable is executed.
Note: For your case, if the modelData and more such Typescript data is included, it should be a part of a new module since it has import statements and they are required to be on top of a module.
var path = "/filepath"
var data = [
{
name: "IParam"
},
{
name: "IError"
}
]
function createInterfaces(path, data){
const imports = data.map(d => d.name).join(', ');
return `import { ${imports} } from '${path}';\n\n`;
}
function buildTypescript(data) {
// To include this data as part of your text, make sure that it's a part of a new module
const modelData = createInterfaces(path,data);
const text = `
let message = "Typecript executed";\n\n
console.log(message)`;
return text;
}
const typescriptDataAsText = buildTypescript(data);
const executableTypescript = new Function(typescriptDataAsText);
executableTypescript()

Read user input txt file with a class in javascript

I have a data file that I need to extract data from. It has to be submitted via html input. I want to make a DataReader class to do so. The class needs to be constructed with the file and extract its attributes from the file, so
class DataReader() {
constructor(file) {
this.file = file;
}
extractData(){...}
}
var data = new DataReader(file);
console.log(data.attr0, data.attr1, data.attr3, ...);
I keep getting scope issues and I don't know how to make the class take a file when instantiated so it separates it's attributes.
This is what I have
class DataReader {
setFile(file) {
this.file = file;
}
getFile() {
return this.file;
}
extractData() {
var self = this; // this == DataReader
var objXMLhttp = new XMLHttpRequest();
objXMLhttp.open("GET","diabetes400.txt",true);
objXMLhttp.send();
objXMLhttp.onreadystatechange = function() {
if (objXMLhttp.readyState==4 && objXMLhttp.status==200) {
var arrContents = objXMLhttp.responseText.split("\n"); // gotcha!
self.setFile(arrContents);
console.log(arrContents);
}
}
}
}
var data = new DataReader();
data.extractData();
console.log(data.file);
If I log only data, i can see an object with file inside it, but file prints undefined
I think you need a FileReader.
Look at this project: http://bgrins.github.io/filereader.js/.
You can read a file an get the contents of it.
Look this example:
var inputUpload = document.getElementById('file-input');
FileReaderJS.setupInput(inputUpload , {
on: {
load: function(event, file){
var textBase64 = event.srcElement.result
var decodedText = atob(e.srcElement.result.split("base64,")[1]);
}
}
});

Parse multiple files with javascript: the same file in for-loop

I have such code:
function processFiles(e) {
var filesInput = $('#files').prop('files');
var i, f;
for (i = 0, f = filesInput[i]; i != filesInput.length; ++i) {
var name = f.name;
console.log(name); //why here is the same file, even if i select in file input 2 different?
var reader = new FileReader();
reader.onload = function(e) {
var myFile = e.target.result;
console.log(myFile); //why here is the same file, even if i select in file input 2 different?
};
reader.readAsBinaryString(f);
}
}
$('#sbmt').click(function(e) {
processFiles();
});
but when i try to parse multiple files, i got the same file in for loop & .onload callback
what i do wrong?
why here is the same file, even if i select in file input 2 different?
Because nothing updates f in the for loop. You've set f in the initialization expression, but you don't update it in the update expression.
If you want to use the for to control f, be sure you update f:
for (i = 0, f = filesInput[i]; i != filesInput.length; ++i, f = filesInput[i]) {
// -------------------------------------------------------^^^^^^^^^^^^^^^^^^^
...but at that point, you're duplicating code; instead, I'd just move the sssignment into the loop body:
for (i = 0; i != filesInput.length; ++i) {
f = filesInput[i]
...or more likely I'd probably use forEach:
function processFiles(e) {
Array.from($('#files').prop('files')).forEach(function(f) {
var name = f.name;
var reader = new FileReader();
reader.onload = function(e) {
var myFile = e.target.result;
console.log(myFile);
};
reader.readAsBinaryString(f);
});
}
(Note that that uses Array.from from ES2015; you'll need a polyfill to use that in the wild for now...)
My 2 cents:
Took a crack at using Response (part of the new fetch api) to get the buffer with help of es6 and Promises
function processFiles(e) {
let files = $('#files')[0].files
let buffers = [...files].map(file => new Response(file).arraybuffer())
Promise.all(buffers).then(buffers => {
// concatinate(buffers)
})
}

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