How do I write php code to check if checkbox is checked or not (1 Viewer)

yara · May 30, 2008

hi

How do I write php code to check if checkbox is checked or not ?

correct my red line please

<html>

<head>

</head>

<body>

<script language="JavaScript" type="text/javascript">

function add()
{

<?php

extract($_POST);

if(category[0].checked)

$query = "INSERT INTO mytable (cat) VALUES ('1')

if(category[1].checked)

$query = "INSERT INTO mytable (cat) VALUES ('2')

if(category[2].checked)

$query = "INSERT INTO mytable (cat) VALUES ('3')

if(category[3].checked)

$query = "INSERT INTO mytable (cat) VALUES ('4')

if(category[4].checked)

$query = "INSERT INTO mytable (cat) VALUES ('5')

if(category[5].checked)

$query = "INSERT INTO mytable (cat) VALUES ('6')

// connect to DB
mysql_connect ('localhost', 'root');

// select the DB
mysql_select_db('mydatabase');

// execute the query
mysql_query($query);

?>
return true;

}

</script>

<form name="myform" method ='post' onsubmit="add();">

<input name="category" type="checkbox" value="flowers"/>

<input name="category" type="checkbox" value="animals"/>

<input name="category" type="checkbox" value="children"/>

<input name="category" type="checkbox" value="nature"/>

<input name="category" type="checkbox" value="nature"/>

<input name="category" type="checkbox" value="other"/>

</form>

</body>

</html>

i hope i get help

AngelaP · May 26, 2009

Why don't you use Javascript instead?

poster_boy · Jun 15, 2009

As AngelaP said using of Javascript is the best method.

eddie21leeds · Aug 31, 2009

hi! i beleive this may be of interest to you... give me a shout if you need a hand editing ithttp://www.dynamicdrive.com/dynamicindex16/formdependency.htm
hope this helps!

ajetrumpet · Aug 31, 2009

yara,

if other posts haven't helped you already, we need to know the context of how your PHP is being used in the first place. is the checkbox on a FORM? is it just part of the document in an arbitrary manner? in general, javascript code to check this is as follows:

PHP:

if (document.getElementById("CheckBoxID").checked = true) {
   alert("THE BOX IS CHECKED!"); }
else { alert("THE BOX IS NOT CHECKED...OOPS!"); }

using javascript in PHP is much easier, as it has been said already, than doing this sort of stuff it was geared for than to have to try and "translate" the same code into PHP language.

moreover, i usually javascript integrated with PHP by using single quotes. for this situation, i would try something like this in PHP to get what you want to get done...

PHP:

'<script language="javascript">if (document.getElementById("CheckBoxID").checked = true) {
   alert("THE BOX IS CHECKED!"); }
else { alert("THE BOX IS NOT CHECKED...OOPS!"); }</script>';

smithdavid · Jun 26, 2013

You can use fallowing javascript code

if (document.getElementById("CheckBoxID").checked = true) {
alert("THE BOX IS CHECKED!"); }
else { alert("THE BOX IS NOT CHECKED...OOPS!"); }

Or
Take the value of check box in a variable
$chk=$_POST['category'];

jj91171 · Jul 30, 2013

How do I write php code to check if checkbox is checked or not
there is the code
<?PHP
if(isset($_POST['submit']))
{
if($_POST['checkbox'] !=' ')
{
put your work which you want to do
}
else
{
echo ' Please check the checkbox';
}
?>

lightray · May 27, 2014

Hi, this post has been of some help to me. My challenge is to set a variable after an on click event [country flags] I will later interrogate this to display appropriate pricing on another page, with if statement. I have good HTML skills and still coming up to speed with PHP and javascript. I am developing this for a Wordpress site.

Would javascript also be the best to code this in?

Elsnertechnologies · Jan 21, 2022

Use the isset() Function on $_POST Array to Read if Checkbox Is Checked
Use the in_array() Function to Read if the Checkbox Is Checked for Checkboxes as an Array
Use the isset() Function With Ternary Function to Read if the Checkbox Is Checked

theDBguy · Jan 21, 2022

Elsnertechnologies said:
Use the isset() Function on $_POST Array to Read if Checkbox Is Checked
Use the in_array() Function to Read if the Checkbox Is Checked for Checkboxes as an Array
Use the isset() Function With Ternary Function to Read if the Checkbox Is Checked

Hi @Elsnertechnologies. Welcome to AWF!

Just FYI, you are replying to an almost 10-year old thread.

How do I write php code to check if checkbox is checked or not (1 Viewer)

yara

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AngelaP

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