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How to bring a json result into PHP

I have some results from a fetch.php using json and I successfully brought all results to my bootstrap modal HTML screen.
When the Modal is being shown, I would like to run a MYSQL query using a value coming from the same json I used for the modal, however I can't put this value into a PHP variable to run the SQL query.
How can I get this?
I am trying to bring the same value I input into the HTML textbox (modal), but it is not working. I also tried to use the value from json '$('#PCR').val(data.PCRNo);)', but nothing happen.
This is the script to collect information from database using fetch.php file:
<script>
$(document).ready(function(){
$('#table').on('click', '.fetch_data', function(){
var pcr_number = $(this).attr('id');
$.ajax({
url:'fetch.php',
method:'post',
data:{pcr_number:pcr_number},
dataType:"json",
success:function(data){
$('#PCR').val(data.PCRNo);
$('#PCC').val(data.PCC);
$('#PCR_Creation').val(data.Creation_Date);
$('#PCR_Status').val(data.Stage);
$('#Required_Completion').val(data.Required_Completion);
}
});
});
});
</script>
This is the PHP code
<?php
//trying to get the value I have included on #PCR (textbox) which has ID='PCR' and name ='PCR' **
$PCR= $_POST['PCR'];
//running now the code to check if the database has the value and return the desired response to be shown **
$sql1 = mysqli_query($dbConnected,"SELECT * FROM change_management.tPCN");
while ($row1 = mysqli_fetch_array($sql1)) {
if ($row1['PCRNo']==$PCR){
echo $row1['PCNNo'];
echo "<br/>";
}else{
}
}
?>
I would like include value from this val(data.PCRNo) json return into the $PCR variable, so the MYSQL query is going to work

There are a number of quite basic logical issues with your code which are preventing it from working.
1) data: { pcr_number: pcr_number}- the name pcr_number doesn't match the value PCR which the server is searching for using $_POST['PCR'];. The names must match up. When making an AJAX request, the name you gave to the form field in the HTML does not matter (unless you use .serialize()) because you are specifying new names in the data parameter.
2) Your SQL query doesn't make sense. You seem to be wanting to read a single row relating to a PCR number, yet your query makes no usage of the input PCR value to try and restrict the results to that row. You need to use a SQL WHERE clause to get it to select only the row with that ID, otherwise you'll fetch all the rows and won't know which one is correct. (Fetching them all and then using an if in a PHP loop to check the correct one is very inefficient.) I wrote you a version which uses the WHERE clause properly, and passes the PCR value to the query securely using prepared statements and parameters (to project against SQL injection attacks).
3) Your output from the PHP also makes no sense. You've told jQuery (via dataType: "json" to expect a JSON response, and then your code inside the "success" function is based on the assumption you'll receive a single object containing all the fields from the table. But echo $row1['PCNNo']; echo "<br/>"; only outputs one field, and it outputs it with HTML next to it. This is not JSON, it's not even close to being JSON. You need to output the whole row, and then use json_encode() function to turn the object into a JSON string which jQuery can parse when it receives it.
Here's a version of the code containing all the above changes:
JavaScript:
$(document).ready(function(){
$('#table').on('click', '.fetch_data', function(){
$.ajax({
url: 'fetch.php',
method: 'post',
data: { pcr: $(this).attr('id'); },
dataType: "json",
success: function(data){
$('#PCR').val(data.PCRNo);
$('#PCC').val(data.PCC);
$('#PCR_Creation').val(data.Creation_Date);
$('#PCR_Status').val(data.Stage);
$('#Required_Completion').val(data.Required_Completion);
}
});
});
});
PHP:
<?php
$PCR = $_POST['pcr'];
$stmt = $dbConnected->prepare("SELECT * FROM change_management.tPCN WHERE PCRNo = ?");
$stmt->bind_param('s', $PCR);
$stmt->execute();
$result = $stmt->get_result();
//an "if" here will cause a single row to be read
if ($row = $result->fetch_assoc()) {
$output = $row;
}
else
{
$output = new StdClass();
}
$stmt->free_result();
$stmt->close();
//output the result
echo json_encode($output);
?>
N.B. I would potentially suggest studying some tutorials on this kind of subject, since this is a fairly standard use case for AJAX/JSON, and you should be able to find samples which would improve your understanding of all the different parts.
P.S. Currently the PHP code above will return an empty object if there is no matching row in the database. However, this is probably an error condition (and will cause your JavaScript code to crash due to trying to read nonexistent properties), so you should consider how you want to handle such an error and what response to return (e.g. 400, or 404, and a suitable message).

You need to first return json from php by using json_encode.
Inside this loop
while ($row1 = mysqli_fetch_array($sql1)) {
$data = array('PCRNo' => 'itsvalue', 'PCC' => 'itsvalue', 'Creation_Date' => 'itsvalue')
}
print json_encode($data)
store all the data in an associative array and then convert it into json using json_encode and return the json.
Use json data in you ajax file
$.ajax({
url:'fetch.php',
method:'post',
data:{pcr_number:pcr_number},
dataType:"json",
success:function(data){
var data = JSON.parse(data);
$('#PCR').val(data.PCRNo);
$('#PCC').val(data.PCC);
$('#PCR_Creation').val(data.Creation_Date);
$('#PCR_Status').val(data.Stage);
$('#Required_Completion').val(data.Required_Completion);
}
});

Below is the changed script to store different values in $PCR variable
<script>
$(document).ready(function(){
var i = 1;
$('#table').on('click', '.fetch_data', function(){
if(i == 1) {
var pcr_number = $(this).attr('id');
} else {
var pcr_number = $('#PCR').val();
}
$.ajax({
url:'fetch.php',
method:'post',
data:{pcr_number:pcr_number},
dataType:"json",
success:function(data){
$('#PCR').val(data.PCRNo);
$('#PCC').val(data.PCC);
$('#PCR_Creation').val(data.Creation_Date);
$('#PCR_Status').val(data.Stage);
$('#Required_Completion').val(data.Required_Completion);
i++;
}
});
});
});
</script>

Saving a search result in Mysql with jQuery/Javascript

I'm trying to save google's API search results in a Mysql database in localhost.
My problem
I'm using a for loop to show every possible result from book research, such as "Harry Potter".
I do this with AJAX and then I cycle the results.
The main problem is that if I want to save one of the results, what is saved is just the last one because every variable is overwritten during every cycle.
Here is the code, saveBook.php is just a .php file where I do an insert into query.
$.ajax({
url:"https://www.googleapis.com/books/v1/volumes?q=" + search,
dataType: "json",
type: 'GET',
success: function(data){
for(i=0; i < data.items.length; i++)
{
title = $( '<p> ' + data.items[i].volumeInfo.title + '</p>');
author = $('<p> ' + data.items[i].volumeInfo.authors + '</p>');
img = $('<img><a href=' + data.items[i].volumeInfo.infoLink +
'><br></br><button>Read More</button></a>' );
url= data.items[i].volumeInfo.imageLinks.thumbnail;
save = $('<br><button onclick="save()">Save</button></br>
</br>');
img.attr('src',url);
title.appendTo("#result");
author.appendTo("#result");
img.appendTo("#result");
save.appendTo("#result");
}
},
});
}
}
function save(){
$.ajax({
type:'POST',
data: {
url: url,
title: title,
author: author,
},
url: "saveBook.php",
success: function(data){
alert("Success!");
location.replace("home.php");
}
})}
Another problem is:
how should I use this JSON
data: {
url: url,
title: title,
author: author,
},
to actually return a string with title and author, because url is correctly saved.

I've had some time to think over your project. While I'm not sure of all of your project requirements, a fundamental pursuit should be to minimize the calls to the api. For this reason, let your users search via a standard (non-ajax) search input/form and load the api results into the html with php, then use your ajax call to allow multiple save calls from a single load of search results (if that makes sense for your project). Basically, I suppose I am discouraging the auto-reload after saving a single item; otherwise you can avoid ajax again.
Also, as far as I know authors is an array, so you'll need to join/implode the values into a single string.
foreach (json_decode($apijson, true) as $item) {
echo '<div class="book">';
// your other elements in the row
echo "<button onclick=\"save('" ,
htmlspecialchars($item['id'], ENT_QUOTES, 'UTF-8') , "','" ,
htmlspecialchars($item['volumeInfo']['title'], ENT_QUOTES, 'UTF-8') , "','" ,
htmlspecialchars(implode(', ', $item['volumeInfo']['authors']), ENT_QUOTES, 'UTF-8') , "','" ,
htmlspecialchars($item['volumeInfo']['imageLinks']['thumbnail'], ENT_QUOTES, 'UTF-8') , "');\">Save</button>";
echo '</div>';
}
Then these parameters can be directly fed to your ajax function.
Be sure to validate and use sensible data sanitizing techniques and use a prepared statement when you INSERT.
You can return a success message from your ajax, and then hide() the saved row/book.
You can return a vague (not exact) error message if the insert did not make an "affected row".

Problem solved thanks to #mickmackusa. I have declared the variable "save" as a global array and, then, I have passed every string with a proper escape. Now it's working fine! Thank you very much.
save[i] = $('<button onclick="save((\'' + data.items[i].volumeInfo.authors + '\'),(\'' + data.items[i].volumeInfo.title + '\'),(\'' + data.items[i].volumeInfo.infoLink + '\'))">Save</button><br><br>')

jQuery / ajax data container + organization

My dad and I are working on a project where we'd like to create a script that calls in data when a number is submitted into a form. For example, when you type in your ID number then press ENTER or SUBMIT, the form will print/display information. This is a project for school, so when a student submits their ID number it will read their first period class, for example.
I have the following script code to set up the form:
<form id="firstPeriod" action="firstPeriod.html">
<p>Find your first period.</p>
<p><label>Student no.: <input type="text" name="studentNo"></label></p>
<p><input type="submit" value="Find it"></p>
<p id="result"></p>
</form>
<script type="text/javascript">
$(function() {
$('#firstPeriod').submit(function() {
$.ajax({ // Send the request behind the scenes
url: $(this).attr('action'), // Send it here
data: $(this).serialize(), // With this student no.
success: function(data) {
$('#result').html(data); // Display the resulting HTML
},
error: function(jqxhr, status, error) {
console.log(error);
$('#result').html('No results found. Please check your number and reenter'); // Notify an error
}
});
return false; // Prevent the normal form submission
});
});
My question is, what would be the best way to organize the data? An array, HTML, etc.? There are quite a lot of ID numbers and are currently set up in an HTML table, but that doesn't seem to work in calling the information. And I'd like for the data to be specific. So when a specific ID number is typed in, it reads a specific answer. Right now my problem is when I type in a number it reads several classes.
If there are any suggestions/advice/other posts that could help me, I'd be grateful. I have solid HTML, CSS experience but I'm still learning JS and jQuery so this is a little new for me. Thanks!

Edit, Updated
Note, added value attribute to input type="text" element
<input type="text" name="studentNo" value="" />
substituted .submit() for .on("click") at input type="submit" element
Two possible approaches could be 1) using HTML to store data, .load() to retrieve fragment identifier within html file; or 2) storing data using JSON, retrieving file using php
html at firstPeriod.html
<div id="0">data 0</div><div id="1">data 1</div>
javascript
$(function() {
var form = $("#firstPeriod");
$("input[type=submit]").on("click", function(event) {
event.preventDefault();
event.stopPropagation();
var data = form.serializeArray();
// where `data[0].value` is `id`; e.g.; `0`
var id = data[0].value;
$("#result").load(form.attr("action") +" #"+ id)
})
})
plnkr http://plnkr.co/edit/4onHf9jlJTyDei1zo9IC?p=preview
JSON
0.json
{
"0":"<div id='0'>data 0</div>"
}
1.json
{
"1":"<div id='1'>data 1</div>"
}
javascript
$(function() {
var form = $("#firstPeriod");
$("input[type=submit]").on("click", function(event) {
event.preventDefault();
event.stopPropagation();
var data = form.serializeArray();
// where `data[0].value` is `id`; e.g.; `0`
var id = data[0].value;
$.post("data.php", {id:id}, function(result) {
$("#result").html(result[id])
}, "json")
})
})
php
<?php
if (isset($_POST["id"])) {
$id = $_POST["id"];
$file = $id . ".json";
if (file_exists($file)) {
$jsondata = file_get_contents($file);
$id_data = json_decode($jsondata, true);
echo json_encode($id_data);
};
}

How to POST with AJAX using just an a tag

I have an a tag that is dynamically generated with database content, it includes a data-target that I capture in javascript when it is clicked on, this is an example of one of the generated buttons:
Edit
Simple, right?
Now, what I do in the JS when it is clicked, is as so:
var $this = $(this),
$target = $this.data("target"),
$endpointURL = "";
$endpointURL = $target.split("?id=")[0];
$id = $target.split("?id=")[1];
This allows me to set the endpoint I want, in out example above, it would be "edit" and also set the id which is just a number at this point.
Now, I have to POST this ID to the edit endpoint to return the right info, correct?
So, here is my AJAX for that:
$.ajax({
type: "POST",
data: '{"id": ' + $id + ' }',
url: "../assets/scripts/php/" + $endpointURL,
success: function (data) {
$("#content-lockup").html(data);
},
error: function (jqXHR, textStatus, errorThrown) {
console.log("error: " + textStatus + ", error thrown: " + errorThrown);
}
});
This does not throw an error and does indeed output a var dump of the $_POST array as I have set it to, however it doesnt contain my ID that I passed over, here is the code on the endpoint and a screenshot of the output:
<?php
var_dump($_POST);
?>
Why would the vardump on $_POST not contain the id that I passed over in the apparently successful AJAX request?
What I expect is that I can say on the endpoint, something like:
$id = $_POST['id'];
Maybe its something obvious that i'm doing wrong but yeah, any ideas?

it's because you are passing a string to data that isn't form encoded
Make it an object and jQuery will encode it for you
data: {"id": $id },
If it's a string it needs to be in format
data: 'id=' +id + '&someOtherParam=' + somevar

How to make dropdown based query mysql in javascript? [duplicate]

This question already has answers here:
Fetching data from MySQL database to HTML dropdown list
(4 answers)
Closed 7 years ago.
<script type="text/javascript">
var rowNum = 0;
function addRow(frm) {
rowNum ++;
var row = '<p id="rowNum'+rowNum+'"> Barang: ';
row += '<select name="???">';
row += '<option value="A1">A1</option>';
row += '<option value="A2">A2</option>';
row += '<option value="A3">A3</option>';
row += '<option value="A4">A4</option>';
row += '</select>';
row += ' Satuan: <input type="text" size="5" name="satuan[]" value="'+frm.add_satuan.value+'"> Quantity: <input type="text" name="qty[]" value="'+frm.add_qty.value+'"> <input type="button" value="Remove" onclick="removeRow('+rowNum+');"><hr color=red></p>';
$('#itemRows').append($(row));
frm.add_qty.value = '';
frm.add_nama.value = '';
frm.add_satuan.value = '';
};
</script>
How to make drop-down list but with query mysql to show A1, A2, dll.
When submit button for drop-down can't post data anything. Can I store data with this javascript. For text input success post data.

DO NOT DO WHAT YOU ARE TRYING TO DO. You should never, ever, ever write queries on the front-end. You should do your absolute best to hide every detail of the server/database from the user. It is a massive security risk. Please read about SQL injection attacks for starters.
How you should do this:
Store the values of the dropsdowns in JavaScript. Let's keep them in a single object to make life easy:
Your JS:
var options = {
A1: $("#rowNum select option[value='A1']").text(),
A2: $("#rowNum select option[value='A2']").text(),
A3: $("#rowNum select option[value='A3']").text(),
A4: $("#rowNum select option[value='A4']").text()
};
// Now, send this object to your PHP via an AJAX call. Let's assume for simplicity that you will do this using jQuery:
$.ajax({
url: 'my/php/script.php',
data: options,
success: function (data) { console.log('Yay, it worked!'); },
error: function (jqXHR, textStatus, error) { console.log('crap it didn't work', jqXHR, textStatus, error); }
});
Your PHP
<?php
$options = $_REQUEST['options']
// You need to verify the options are valid (and don't have bad values) but that's a different question
// Build your query here. Your PHP is run on the server only so no one else will see it or be able to change it.

You can try this code with some modification. Use jQuery's each to iterate over the array value.
$('#emptyDropdown').empty();
// Parse the returned json data
//var opts = $.parseJSON(data);//Remove comment if you are using JSON
// Use jQuery's each to iterate over the opts value
$.each(opts, function(i, d) {
// You will need to alter the below to get the right values from your data.
$('#emptyDropdown').append('<option value="' + d.yourID + '">' + d.yourValue + '</option>');
});