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Cannot get the number of var using javascript

I have this certain problem where I cannot get the number value of 'currentStock' var data inside an HTML file using JavaScript. I have this on my HTML file in script tag:
By the way, due to the HTML being too large, and also it was not originally my script, but from a friend who was asking for some help on adding some features in it, I can't upload the whole script as it will be going to be too long. The whole HTML script has 14076 characters with 289 lines.
I have only studied java and not javascript with HTML, so I need help with this one.
<script>
window.onload = function() {
var goDown = document.getElementById('uniqueNav');
var goRight = document.querySelector('.clothesNav');
var goUp = document.querySelector('.shrink');
goDown.style.marginTop = "0px";
goRight.style.marginLeft = "5px";
goUp.style.height = "0px";
}
$('document').ready(function(){
var name = "Ombre Printed Shirt";
var price = "P499.00";
var initialStock = 0;
var currentStock = initialStock;
document.querySelector('#clothTitle').innerHTML = "" +name;
document.querySelector('#clothPrice').innerHTML = "Price: " +price;
document.querySelector('#PITitle').innerHTML = "" +name;
document.querySelector('#PIPrice').innerHTML = "Price: " +price;
document.querySelector('#currentStock').innerHTML = "CurrentStocks: " +currentStock;
}); //------------------------Change This Every Document ----------------------------//
</script>
then this in my JavaScript File:
var cStocks = document.getElementById('currentStock').data;
alert(typeof cStocks);
alert("Data in cStocks = " + cStocks);
if (!cStocks) {cStocks = 0; alert("cStocks, not a valid number");}
if ((cStocks <= 0) == true)
{
document.querySelector('.clothButton').style.display='none';
document.querySelector('.clothButtonDisabled').style.display='flex';
}
else
{
document.querySelector('.clothButton').style.display='flex';
document.querySelector('.clothButtonDisabled').style.display='none';
}
upon loading the page, the alert says thaat the data type is undefined. I don't know what's happening with my code. did I miss something?
By the way, I have JQuery on my HTML page. it says JQuery v3.3.1 as a version

It doesn't look to me like #currentStock will have a data attribute, or value attribute (which is for inputs), so of course the js returns undefined. Right now it looks like #currentStock is having the innerHTML set on the document.ready to Current Stocks: 0
You do have an accessible variable, currentStock, which is defined during document.ready. Why aren't you accessing it directly? It will have the numeric value in it already. All you can get from #currentStock is the html you generated on document.ready, and you'd have to parse the number out of it, when it's available in raw form in the js variable currentStock.

How to use explode function to delimit and display different values

I’m making a random sentence generator for my English class. I’m close but because of my limited php and javascript knowledge I need to ask for help. I’m not bad at reading the code, I just get stuck writing it.
I want to use explode to break up a string of comma seperated values. The string is a mix of English and Spanish, on the .txt file they would seperated like:
The book, El libro
The man, El hombre
The woman, La mujer
etc.
I would like to break these two values into an array and display them in separate places on my web page.
I`m going to use a random text generator script that I found, it’s working great with no problems. I just need to modify it using explode to read, separate the values into an array, and be able to display the separate values of the array.
<?php
/* File, where the random text/quotes are stored one per line */
$settings['text_from_file'] = 'quotes.txt';
/*
How to display the text?
0 = raw mode: print the text as it is, when using RanTex as an include
1 = Javascript mode: when using Javascript to display the quote
*/
$settings['display_type'] = 1;
/* Allow on-the-fly settings override? 0 = NO, 1 = YES */
$settings['allow_otf'] = 1;
// Override type?
if ($settings['allow_otf'] && isset($_GET['type']))
{
$type = intval($_GET['type']);
}
else
{
$type = $settings['display_type'];
}
// Get a list of all text options
if ($settings['text_from_file'])
{
$settings['quotes'] = file($settings['text_from_file']);
}
// If we have any text choose a random one, otherwise show 'No text to choose from'
if (count($settings['quotes']))
{
$txt = $settings['quotes'][array_rand($settings['quotes'])];
}
else
{
$txt = 'No text to choose from';
}
// Output the image according to the selected type
if ($type)
{
// New lines will break Javascript, remove any and replace them with <br />
$txt = nl2br(trim($txt));
$txt = str_replace(array("\n","\r"),'',$txt);
// Set the correct MIME type
header("Content-type: text/javascript");
// Print the Javascript code
echo 'document.write(\''.addslashes($txt).'\')';
}
else
{
echo $txt;
}
?>
The script that displays the result:
<script type="text/javascript" src="rantex.php?type=1"></script>
Can someone please help me modify the rantex.php file so that I can use explode to separate the different comma separated values, and use a different script to call them in different places on my web page?
Thank you, and please excuse my noobness.

The following seems unnecessary, since file() will have already removed new line characters:
// New lines will break Javascript, remove any and replace them with <br />
$txt = nl2br(trim($txt));
$txt = str_replace(array("\n","\r"),'',$txt);
To break your line, you may instead use:
list($english, $spanish) = explode(', ', trim($txt));

It seems you are trying to use PHP to serve a static page with some random sentences, right? So why not use PHP to serve valid JSON, and handle to display logic on the client?
Heres a quick implementation.
// Get the data from the text file
$source = file_get_contents('./quotes.txt', true);
// Build an array (break on every line break)
$sentences = explode("\n", $source);
// Filter out empty values (if there is any)
$filtered = array_filter($sentences, function($item) {
return $item !== "";
});
// Build a hashmap of the array
$pairs = array_map(function($item) {
return ['sentence' => $item];
}, $filtered);
// Encode the hashmap to JSON, and return this to the client.
$json = json_encode($pairs);
Now you can let the client handle the rest, with some basic JavaScript.
// Return a random sentence from your list.
var random = sentences[Math.floor(Math.random() * sentences.length)];
// Finally display it
random.sentence
[edit]
You can get the JSON data to client in many ways, but if you don't want to use something like Ajax, you could simply just dump the contents on your webpage, then use JavaScript to update the random sentence, from the global window object.
// Inside your php page
<p>English: <span id="english"></span></p>
<p>Spanish: <span id="spanish"></span></p>
<script>
var sentences = <?= json_encode($pairs); ?>;
var random = sentences[Math.floor(Math.random() * sentences.length)];
var elspa = document.getElementById('spanish');
var eleng = document.getElementById('english');
elspa.innerText = random.sentence.split(',')[1];
eleng.innerText = random.sentence.split(',')[0];
</script>

Ok, so I have this figured out, I take 0 credit because I paid someone to do it. Special thanks to #stormpat for sending me in the right direction, if not for him I wouldn't have looked at this from a JSON point of view.
The .PHP file is like so:
<?php
$f_contents = file('quotes.txt');
$line = trim($f_contents[rand(0, count($f_contents) - 1)]);
$data = explode(',', $line);
$data['eng'] = $data[0];
$data['esp'] = $data[1];
echo json_encode($data);
?>
On the .HTML page in the header:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script>
(function ($) {
$(function()
{
function load_random_data() {
$.get('random_line.php', function(data) {
var data = $.parseJSON(data);
$('#random_english').text(data.eng);
$('#random_spanish').text(data.esp);
});
}
load_random_data();
$('#get_random').click(function(e){
e.preventDefault();
load_random_data();
});
});
})(jQuery);
</script>
This splits the different variables into classes, so to call them into my html page I call them by their class, for instance I wanted to drop the variable into a table cell so I gave the individual td cell a class:
<td id="random_spanish"></td>
<td id="random_english"></td>
Plus as a bonus the coder threw in a nifty button to refresh the json classes:
<input type="button" value="Get random" id="get_random" />
So now I don`t have to have my students refresh the whole web page, they can just hit the button and refresh the random variables.
Thanks again everyone!

Convert PHP objects array to javascript array

I retrieve image paths with the function get_all();. This get_all function retrieves images as an object. This object has the attributes name, source_path and date. I want my javascript to add images to a div. I have the following:
The instantiate.php includes files like Jquery and another JS file.
<?php
require_once("../../include/instantiate.php");
$photos = Photos::get_all();
$JSPhotos;
foreach($photos as $photo) { $JSPhotos + $photo->source_path; }
?>
<script type="text/javascript">
$(document).ready(function() {
var photos = <?php echo json_encode($JSPhotos); ?>;
for(var i = 0; i <= 10; i++)
{
create_image("../"+photos[i]);
}
});
This does not work. Anyone got a solution?
Solution in Jeroen's Post!
New Problem;
In the create_image function I set the class and src of the image element. When you click such an image I want an alert box to show up. I have checked if the class is set correctly, and I concluded that all images did have the classname "imgid". So, any idea why this dont work?
Script in the javascript part:
$(".imgid").click(function() {
alert("hey");
});

You are not assigning anything to your variable.
You probably want:
$JSPhotos = array();
foreach($photos as $photo) {
$JSPhotos[] = $photo->source_path;
}
Or something similar.

jQuery $.post() using output data as selector

I am trying to build a quiz environment. The user selects an answer and then clicks submit. Upon submit, the following jquery is called:
$(document).ready(function() {
$('.btn-large').click(function() {
$.post("correct_quiz.php",
{
choices : $('input[name=choice][type=radio]:checked').serialize()
},
function(data) {
var temp = '#correct' + data;
var temp2 = '#correct3';
$(temp).show(); // Make the wrong/right icons visible
});
});
});
This jquery makes a green or red icon appear, based on whether the answer was correct or not. The correct_quiz.php script contains:
<?php
$root = "/users/stadius/maapc/public_html/";
include($root . "connect_to_database.php");
$choices = $_POST['choices']; // This will for example output "choice=3"
echo substr($choices,7,7); // This will then output "3"
?>
I ran into a problem, when I try the above jquery code with variable temp2 the script works like I want. But when I try it with variable temp it doesn't. When I debug, I see that they contain exactly the same string though: both are '#correct3' (when I choose the 3rd answer).
So why is this not working when I use variable temp, and is working when using temp2?

I think your problem is in this line:
echo substr($choices,7,7);
Try to use:
$list = explode('=', $choices);
echo $list[1];
instead of substr

Insert javascript from an external script into javascript in the HTML

I have some JS from an external JS file that I want to insert inside of a JS function in the HTML file. I can not touch the JS script in the HTML file, so I am wondering if this method can be done.
Here is the JS I want to insert inside of the JS function in the HTML file.
// FIRST JS TO INSERT
if (OS == "mobile"){
killVideoPlayer();
}
// SECOND JS TO INSERT
if (OS == "mobile"){
loadHtmlFiveVideo();
if (!document.all){
flvPlayerLoaded = false;
}
}else {
loadVideoPlayer();
}
Then I want to insert it into here.
<script>
function mediaTypeCheck() {
if (bsiCompleteArray[arrayIndex].mediaType == "video") {
// INSERT FIRST JS HERE
document.getElementById("bsi-video-wrap").style.display = "block";
document.getElementById('pngBsi').style.display = "block";
document.getElementById("frame_photo").style.display = "none";
document.getElementById("relativeFrame").style.display = "block";
document.getElementById("buy-me-photo-button-bsi").style.display = "none";
// INSTER SECOND JS HERE
loadVideoPlayer();
}
if (bsiCompleteArray[arrayIndex].mediaType == "photo") {
killVideoPlayer();
document.getElementById("bsi-video-wrap").style.display = "none";
document.getElementById('pngBsi').style.display = "block";
document.getElementById("relativeFrame").style.display = "block";
document.getElementById("frame_photo").style.display = "block";
document.getElementById("buy-me-photo-button-bsi").style.display = "block";
if (!document.all){
flvPlayerLoaded = false;
}
}
}
</script>
Thank you!

In JavaScript, you can overwrite variables with new values at any time, including functions.
By the looks of it, you could replace the mediaTypeCheck function with one of your own that does what you need and then calls the original function.
E.g.
(function(){
// keep track of the original mediaTypeCheck
var old_function = mediaTypeCheck;
// overwrite mediaTypeCheck with your wrapper function
mediaTypeCheck = function() {
if ( conditions ) {
// do whatever you need to, then ...
}
return old_function();
};
})();
The above can be loaded from any script, so long as it happens after the mediaTypeCheck function is defined.

The easiest way for me in the past has been using server-side includes. Depending on your back end, you can set up a PHP or ASP page or whatever to respond with a mime type that mimics ".js".
I'm not a PHP guy, but you'd do something like this: (if my syntax is incorrect, please someone else fix it)
<?php
//adding this header will make your browser think that this is a real .js page
header( 'Content-Type: application/javascript' );
?>
//your normal javascript here
<script>
function mediaTypeCheck() {
if (bsiCompleteArray[arrayIndex].mediaType == "video") {
//here is where you would 'include' your first javascript page
<?php
require_once(dirname(__FILE__) . "/file.php");
?>
//now continue on with your normal javascript code
document.getElementById("bsi-video-wrap").style.display = "block";
document.getElementById('pngBsi').style.display = "block";
.......

You cannot insert JS inside JS. What you can do is insert another tag into the DOM and specify the SRC for the external JS file.

You can directly insert js file using $.getScript(url);
if you have script as text then you can create script tag.
var script = docuent.createElement('script');
script.innerText = text;
document.getElementsByTagName('head')[0].appendChild(script);

The issue in your case is that you cannot touch the script in the html, so I'll say that it cannot be done on the client side.
If you could at least touch the script tag (not the script itself), then you could add a custom type to manipulate it before it executes, for example:
<script type="WaitForInsert">

Your question looks some strange, but seems to be possible. Try my quick/dirty working code and implement your own situation:
$(document.body).ready(function loadBody(){
var testStr = test.toString();
var indexAcc = testStr.indexOf("{");
var part1 = testStr.substr(0, indexAcc + 1);
var part2 = testStr.substr(indexAcc + 1, testStr.length - indexAcc - 2);
var split = part2.split(";");
split.pop();
split.splice(0,0, "alert('a')");
split.splice(split.length -1, 0, "alert('d')");
var newStr = part1 + split.join(";") + ";" + "}";
$.globalEval(newStr);
test();
}
function test(){
alert('b');
alert('c');
alert('e');
}