for several days now I'm learning html, CSS and now javascript. What I need is a way to get the informations of an pdf document into my html webpage.
I tried several things now and couldnt find the correct answer or informations I need. So here come an use case:
get an .pdf document into a folder
get the information of all .pdf documents of the target folder (with the exact same formatting)
convert those information into html context
get this html context to show on the webpage (images and text)
1 is trivial, I can just drag and drop my documents
2 I'm thinking about something like an array, which then calls the folder to get data into it.
For this I found:
'use strict';
function getFiles(dir) {
fileList = [];
var files = fs.readdirSync(dir);
for (var i in files) {
if (!files.hasOwnProperty(i)) continue;
var name = dir + '/' + files[i];
if (!fs.statSync(name).isDirectory()) {
fileList.push(name);
}
}
return fileList;
}
console.log(getFiles('pathtodirectory'));
Here I'm always getting a reference error, no matter what the path, well I can use only a local path on my pc for now. I'm not 100% sure what everything does, but I think I got it good so far. This function just gets me a list of the documents to work with.
3 That's even more tricky for me now, but I think if I get the data to work with, I may be able to work something out.
4 I think I can do it with a little research
I am happy for any tips or solutions, as I said I'm quite new to all of this :)
regards,
Pascal
'use strict';
function getFiles(dir) {
fileList = []; // <- This becomes a global variable
Should be:
'use strict';
function getFiles(dir) {
var fileList = []; // <- Now it's local to this scope
Because creating implicit global variables are not allowed in strict mode.
Also the getDirSync return an array, so you should treat it as such:
function getFiles(dir) {
fileList = [];
var files = fs.readdirSync(dir);
for (var i = 0; i < files.length; i++) {
var name = dir + '/' + files[i];
if (!fs.statSync(name).isDirectory()) {
fileList.push(name);
}
}
return fileList;
}
Or with .reduce:
function getFiles(dir) {
return fs.readdirSync(dir).reduce(function(arr, file) {
var name = dir + '/' + file;
if (!fs.statSync(name).isDirectory()) {
arr.push(name);
}
return arr;
}, []);
}
Related
I am attempting to do a file search based off array of file names and root directory. I found some file search snips online that seem to work when I am finding just 1 single file, but it will not work when there is more than 1 file specified. Below is the snippet:
const fs = require('fs');
const path = require('path');
var dir = '<SOME ROOT DIRECTORY>';
var file = 'Hello_World.txt'
var fileArr = ['Hello_World.txt', 'Hello_World2.txt', 'Hello_World3.txt'];
const findFile = function (dir, pattern) {
var results = [];
fs.readdirSync(dir).forEach(function (dirInner) {
dirInner = path.resolve(dir, dirInner);
var stat = fs.statSync(dirInner);
if (stat.isDirectory()) {
results = results.concat(findFile(dirInner, pattern));
}
if (stat.isFile() && dirInner.endsWith(pattern)) {
results.push(dirInner);
}
});
return results;
};
console.log(findFile(dir, file));
Any thoughts on how I can get this working with an array rather than just a single file string?
Doing the following seems to be working, but didn't know if there were other ways to do this which may be simpler:
newFileArr = [];
fileArr.forEach((file => {
//findFile(dir, file).toString();
console.log(findFile(dir, file).toString());
}));
The only thing that needs to change is the condition to determine if an individual filepath meets the search criteria. In the code you've posted, it looks like dirInner.endsWith(pattern), which says "does the filepath end with the given pattern?"
We want to change that to say "does the filepath end with any of the given patterns?" And closer to how the code will look, we can rephrase that as "Can we find a given pattern such that the filepath ends with that pattern?"
Let's rename pattern to patterns. Then we can simple replace dirInner.endsWith(patterns) with patterns.some(pattern => dirInner.endsWith(pattern))
I have a function that has one required parameter and a variable number of parameters. I'm passing an array of blobs to the functions. A simplified version of the function looks like this:
function test(directory, blob0, blob1) {
for (var argumentIndex = 1; argumentIndex < arguments.length; argumentIndex++) {
var bytes = arguments[argumentIndex].getBytes();
//do some things
}
}
I'm using the rhino runtime so I can't use the spread operator. The closest I've come to making it work is by using the apply function, but I'm not sure how to also pass the required parameter (directory) in the test function above.
var blobs = [];
blobs[0] = getBlob();
blobs[1] = getBlob();
blobs[2] = getBlob();
test.apply(null,blobs) //doesn't set required parameter (directory)
You want to use an array of blobs as the expanded values of blob0, blob1, blob2 at test(directory, blob0, blob1, blob2).
You want to use directory at test(directory, blob0, blob1, blob2) by adding directory.
If my understanding is correct, how about this answer? Please think of this as just one of several possible answers.
In this answer, bind is used.
Modified script:
// sample getBlob(). This returns a blob.
function getBlob() {return Utilities.newBlob("sample", MimeType.PLAIN_TEXT)}
function test(directory, blob0, blob1, blob2) {
Logger.log("%s, %s, %s, %s", directory, blob0, blob1, blob2) // <--- directory, Blob, Blob, Blob
for (var argumentIndex = 1; argumentIndex < arguments.length; argumentIndex++) {
var bytes = arguments[argumentIndex].getBytes();
//do some things
}
}
// Please run this function.
function myFunction() {
var directory = "directory";
var blobs = [];
blobs[0] = getBlob();
blobs[1] = getBlob();
blobs[2] = getBlob();
test.bind(this, directory).apply(null, blobs);
}
In this modified script, directory is added using bind.
When myFunction() is run, you can see directory, Blob, Blob, Blob at Logger.log("%s, %s, %s, %s", directory, blob0, blob1, blob2) in the function test(directory, blob0, blob1, blob2).
References:
Function.prototype.bind()
Is JavaScript function.bind() supported in google sheets?
I thought that this thread might be useful.
If I misunderstood your question and this was not the direction you want, I apologize.
Use the unshift() function, it adds an element to the begining of an array
var blobs = [];
blobs[0] = getBlob();
blobs[1] = getBlob();
blobs[2] = getBlob();
blobs.unshift(directory)
test.apply(null,blobs)
What I have: 50 mp3 files in a folder.
What I want to do: Create an object for every file that includes name and src.
What I don't know how to do is select and get properties from all of the files. Is it even possible? I know that you can get info from a text file via JS.
It would maybe be something like:
for (var i = 0; i < musicFolder.length; i++) {
var object = new Object (
musicFolder[i].title,
musicFolder[i].path/src
);
objectArray.push(object);
}
I would perhaps need to select an entire folder, but I dont know how to do this is JS.
Assuming that you are running this in Node.js and you only need the name and the path of the file, you can do this:
var fs = require('fs');
path = 'your path here';
const res = [];
fs.readdir(path, (err, items) => {
for (var i=0; i<items.length; i++) {
res.push({
name: items[i],
src: `${path}/${items[i]}`
});
}
console.log(res)
});
This will iterate your folder and list all the files in it. Then it will save the name of the file and its path in a object and push it to an array.
I have several typescript files, some of them export a const named APIS.
I'm trying to access those exports (I want to concatenated all of them to a single file), but it doesn't seem to work. I'm obviously doing something wrong, but I'm not sure what.
For example, I have a folder named services, with 2 files: service1.ts, service2.ts.
service1.ts:
...
export const APIS = [ { "field1" : "blabla" } ];
service2.ts: does not contain the APIS var.
This is my gulpfile.js:
var gulp = require('gulp');
var concat = require('gulp-concat');
var map = require('gulp-map');
gulp.task('default', function() {
return gulp.src('.../services/*.ts')
.pipe(map(function(file) {
return file.APIS;
}))
.pipe(concat('all.js'))
.pipe(gulp.dest('./test/'));
});
When I run this task, I get nothing. When I added console.log(file.APIS); to the map function, I get undefined for all the values (although it is defined in service1.ts!).
This is following to: Extracting typescript exports to json file using gulp
EDIT: OK, so I tried saving the exports in a .js file instead of a .ts file, and now I can access those vars using require:
gulp.task('default', function() {
return gulp.src('./**/*.service.export.js')
.pipe(map(function(file) {
var fileObj = require(file.path);
...
}))
Now if I try console.log(fileObj.APIS); I get the correct values. What I'm still confused about is how I can pass these value on, and create a single file out of all these vars. Is it possible to push them into an array?
This will not work as you think it would work. Gulp itself knows nothing about typescript files, that file is a vinyl-file and has no knowledge about the typescript code within its content.
Edit
Based on your example, you can do something like this:
var gulp = require('gulp');
var concat = require('gulp-concat');
var map = require('gulp-map');
var fs = require('fs');
gulp.task('test', function ()
{
var allConstants = [];
var stream = gulp.src('./**/*.service.export.js')
.pipe(map(function(file)
{
var obj = require(file.path);
if (obj.APIS != null)
allConstants = allConstants.concat(obj.APIS);
return file;
}));
stream.on("end", function (cb)
{
// Do your own formatting here
var content = allConstants.map(function (constants)
{
return Object.keys(constants).reduce(function (aggregatedString, key)
{
return aggregatedString + key + " : " + constants[key];
}, "");
}).join(", ");
fs.writeFile('filename.txt', content, cb);
});
return stream;
});
Suggestion
If you want to collect multiple variables into a single file i.e. a common variables file I suggest gulp-replace.
Steps
Create a file, require it and use tags within that file to place your variables.
Advice
If you are already using services don't create an array. Instead create an object (JSON) where every property is a constant. i.e.
var constants = {
const_1: 0,
const_2: 1,
const_3: 2,
}
here is the code snippet of what I am working with right now...
/*
Module: inputReader.js, directoryScanner.js (included)
Description: Basic file reader returns string of contents of a file from a set file name
Needs to be done: Add key listener to allow for a dynamic file name
*/
// Declare node.js module dependencies from API
var fs = require('fs'),
wrench = require('wrench'),
util = require('util')
// Define module to be exported as a function(s)
module.exports = {
dirRead: function() {
var rootfolder = './node_modules';
var filteredfiles = [];
var files = [];
var fileextension = '.html';
files = wrench.readdirSyncRecursive(rootfolder)
for (var i = 0; i<files.length; i++) {
if (files[i].indexOf(fileextension) != -1) {
filteredfiles.push(files[i]);
}
}
return filteredfiles;
},
fileRead: function() {
// Call synchronous fileSystem function readFileSync on file name
for(i = 0; i<filteredfiles.length; i++) {
var temp = fs.readFileSync(filteredfiles[i].toString(), 'utf8')
return temp
}
}
};
I am exporting a module of 2 different functions; the first (readDir) that reads a directory and its' subdirectories for a list of files and the second (readFile) which relies on the first (reads the list of files from the first function and actually goes through each file).
The problem is when I try to call that look of filteredfiles in the 2nd function, readFile, I get an error saying filteredfiles is undefined.
I am not sure how to fix this, may someone help me please? (My guess is a scope problem)...
res.send(reader.dirRead()) and then, res.send(reader.fileRead(reader.dirRead()))
filteredfiles is declared locally in dirRead function (so it is not visible for fileRead function). You must declare it in some higher scope, or pass it as a fileRead parameter.