Trying to transfer mysql database data to javascript array

Question

I have tried few things bet they don't seem to work, my code works fine if I populate the array myself without database therefore the problem is with retrieving data from database.

var countries = <?php
require('connection.php');
$query = 'SELECT product_name FROM products';
$result = mysqli_query($conn, $query);
while($products = mysqli_fetch_array($result, MYSQLI_NUM)){
    echo json_encode($products);
//OR
//$products = mysqli_fetch_all($result, MYSQLI_NUM);
//echo json_encode($products);
}
 ?>;

This is the code I have tried but it is not working I am sending countries to a function

autocomplete(document.getElementById("myInput"), countries);

In this function I am parsing through the array in such a way

for (i = 0; i < arr.length; i++) {
    /*check if the item starts with the same letters as the text field value:*/
    /*here arr is the array 'countries' send to the function autocomplete*/
    if (arr[i].substr(0, val.length).toUpperCase() == val.toUpperCase()) {//code snippet
   }}

Syscall · Accepted Answer · 2018-04-07 09:11:51Z

1

You are echoing a JSON string at each iteration of the while() loop. So, it will writes a non-valid JSON string. You could create an array, populate it, and finally, write it as JSON:

<?php
require('connection.php');
$query = 'SELECT product_name FROM products';
$result = mysqli_query($conn, $query);
$products = []; // new array
while($product = mysqli_fetch_array($result, MYSQLI_NUM)) {
    $products[] = $product ; // push into array
}
// finally, write JSON:
?>
var countries = <?php echo json_encode($products) ?>;

edited Apr 7, 2018 at 9:11

answered Apr 6, 2018 at 22:00

Syscall

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7 Comments

Anonymous Over a year ago

I have already tried this too because this solution was given in the answer of an another question at stackoverflow. Is there any other way of doing this?

Syscall Over a year ago

@Anonymous Please, what's the problem you're facing with this? What is the given error? Could you please show the output? Thanks.

Anonymous Over a year ago

I am trying to send an array to a function which will parse through the array and apply autocomplete to the textfield. I have now realized that I have been parsing the array as an numeric array but maybe I am getting an associative array in "countries" I am updating the Question, maybe that will help in understanding what I am trying to achieve

Syscall Over a year ago

@Anonymous Ok, I see. Could you please add a little part of your array? Thank you.

Anonymous Over a year ago

var countries = ["Santana Gamma - Syrah","Santana Axel - Black","Canon EOS 5D Mark IV","Sony Alpha99 II","Nikon D3300","Pentax K-1","microSD Card","Canon EOS 77D"]; //this is the kind of array I am trying to get from the database and if I explicitly define it then the code is working fine

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