Get submit button value from multiple buttons php

Question

I have a dynamic menu inside a form element code is here

<form method="GET" action="index.php">
<?php
display_menu(); // this function generates menu items
?>
</form>

after the menu is generated every menu item is a submit button of the above form I want to get input of a single element by name or id attribute of submit button, and load a post from database.

<form method="GET" action="index.php">
<input type="submit" name="page-1" id="page-1" value="page-1">
<input type="submit" name="page-2" id="page-2" value="page-2">
<input type="submit" name="page-3" id="page-3" value="page-3">
<input type="submit" name="page-4" id="page-4" value="page-4">
</form>

so when any input button is pressed the function display_post() is called. Code of the function is as follows:-

function display_post(){
$conn = mysqli_connect('localhost', 'root', '', 'posts') or die('cannot connect');
if($_SERVER['REQUEST_METHOD'] == 'GET' ){
$blog_post_id = $_GET["id"]; 
$sql = "SELECT * FROM blog_posts where id='blog_post_id' ";
$result = mysqli_query($conn, $sql) or die('cannot load');
while ($row = mysqli_fetch_assoc($result)){
if($row > 0){
echo '<div>'.$row['content'].'</div>';
}else echo 'no posts';
}
}
}

However, the display_post() method is called inside a content tag whereas the display_menu() is called inside another div. So the problem is I'm unable to get the id of the to submit button any help will be appreciated thanks in advance.

Using unsanitized GET parameter is not recommended and can lead to sqlinjections. You should make sure `$blog_post_id` is a numeric value first. — Dominic Wehrmann, Oct 05 '18 at 09:54
We can't get input fields by `id`, we get input fields by `name` as you trying to get `$_GET["id"];` — Gufran Hasan, Oct 05 '18 at 10:03
I have tried $_GET["name"]; too but the same notice undefined — Zubair, Oct 05 '18 at 10:21
Please get it by name like `page-1` or `page-2`, or `page-3` or `page-4` these are field name. the name is the field attribute. — Gufran Hasan, Oct 05 '18 at 10:25
I think you first read these articles https://www.tutorialrepublic.com/php-tutorial/php-form-handling.php and https://www.w3schools.com/php/php_forms.asp — Gufran Hasan, Oct 05 '18 at 10:26

Gufran Hasan · Answer 1 · 2018-10-05T10:13:42.660

0

When you click on the submit button you will get all inputs values of the form.

Do one thing put this statement print_r($_GET);exit; in display_post() as a first line and see what you get after clicking on submit button.

Note: 1. you want to get the value of clicked button then you should use javascript or jQuery and Ajax. 2. You can not get input fields value by fields ID. ex. if we have field <input type="submit" name="page-1" id="page-1" value="page-1"> then we can get its value as:

echo $_GET['page-1'];

page-1 is the input field name.

edited Oct 05 '18 at 10:13

answered Oct 05 '18 at 09:38

Gufran Hasan

8,910
7
38
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see these solutions https://stackoverflow.com/questions/1200266/submit-a-form-using-jquery and https://www.johnmorrisonline.com/jquery-tutorial-submit-a-form-and-post-data-using-jquery-and-ajax/ – Gufran Hasan Oct 05 '18 at 09:46
I put the variable print_r($_GET) after the line $blog_post_id = $_GET["id"]; and get output Array ( [9] => html ) – Zubair Oct 05 '18 at 09:52
put it as a first line in function `print_r($_GET) ;exit();` then see th result would be `array("page-1"=>page-1,"page-2"=>page-2,"page-3"=page-3, "page-4"=>page-4)`. – Gufran Hasan Oct 05 '18 at 09:57
same output and have value as Array ( [9] => html ) but I am unable to collect value in variable $blog_post_id = $_GET["id"] or even using array index $blog_post_id = $_GET["0"] – Zubair Oct 05 '18 at 10:03

Sudarshan Thatypally · Answer 2 · 2020-12-21T11:26:15.840

0

If I am guessing right what is your difficulty then

$blog_post_id = $_GET['id']; 
$sql = "SELECT * FROM blog_posts where id='".$blog_post_id."' ";//I modified this line
$result = mysqli_query($conn, $sql) or die('cannot load');

edited Dec 21 '20 at 11:26

answered Oct 05 '18 at 10:03

Sudarshan Thatypally

11
3

it says Notice: Undefined index: id on this line – Zubair Oct 05 '18 at 10:11
Yes right, please see your input fields name these are `page-1`, `page-2`, `page-3`, `page-4`. – Gufran Hasan Oct 05 '18 at 10:18
@sudarshan, we can not get fields value by attributes like `id` or `name` as you are trying `$_GET["id"]; `. this will not work. – Gufran Hasan Oct 05 '18 at 10:31

score 0 · Answer 3 · edited Oct 07 '18 at 17:48

0

You can make 5 different forms for each button and change the action to

action="index.php?id=1"

Then use $_GET['id']

Also change id='blog_post_id' " to id='$blog_post_id' "

edited Oct 07 '18 at 17:48

Michael Lihs

7,460
17
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answered Oct 05 '18 at 11:24

Zack Heisenberg

499
6
12

Get submit button value from multiple buttons php

3 Answers3