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PHP Four - Working with HTML Forms - PHP and HTML Checkboxes

Posted by 77469917-Dfreeman 
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77469917-Dfreeman
PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 13, 2012 11:09AM
Hi there again.

So when testing the checkboxes script. i see all the == are seperated by a space. which i've now changed. but when you choose books is it supposed to tell you which ones you picked ?
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Gaia77490614
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 15, 2012 04:03PM
I have completed this section.
Golly, I tried to answer your question but now sure what you mean.
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77471466_Alwyn
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 16, 2012 08:36AM
It's only suppose to keep the boxes you ticked, ticked when you press the submit button.
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avatar
77553055
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 16, 2012 10:38AM 
Language: PHP
<?php 
//when you load page, this set the default of the checkboxes i.e unchecked as stated below
$me = ';unchecked';;
$you = ';unchecked';;
$us = ';unchecked';;
 
//this code deals with the method of how the form is submitted.
if (isset($_POST[';submit1';]))
{
/* at this point, the code states that if by POST $me is the same
value as tea; the checked box of me will return true */
	if(isset($_POST[';me';]))
		{
        	$me = $_POST[';me';];
		if($me == ';tea';)
		{
		$me = ';checked';;
		}
		}
/* similarly, the code states that if by POST $you is the same
value as coke; the checked box of you will return true */
	if(isset($_POST[';you';]))
		{
        $you = $_POST[';you';];
	if($you == ';coke';)
		{
		$you = ';checked';;
		}
		}
/* also, the code states that if by POST $us is the same
value as cake; the checked box of us will return true */
	if(isset($_POST[';us';]))
		{
        	$us = $_POST[';us';];
	if($us == ';cake';)
		{
		$us = ';checked';;
		}
		}
}
?>

Language: HTML
/*<?php print $me or $you or $us; ?> in the body content retains the the actual action performed!
If true (the boxes remain checked) else remain unchecked.*/
<body>
<form name="form1" method="POST" action= "t.php">
 
<input type=';checkbox'; name=';me'; value=';tea'; <?php print $me; ?>> tea<br>
<input type=';checkbox'; name=';you'; value=';coke'; <?php print $you; ?>> coke<br>
<input type=';checkbox'; name=';us'; value=';cake'; <?php print $us; ?>> cake<br>
<br>
<input type=';submit'; value=';Choose varieties to remember'; name=';submit1';></p>
</form>
 
</body>
try to review this short example and read the comments in the code. Am sure it will help in its own little way. Section completed. Cheers!
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77570952-Sian
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 19, 2012 12:06PM
I have completed this section, php4 - Working with HTML forms.

For the last exercise where it asks "Suppose your web site has only 5 users. Create a HTML form to check if a visitor is one of the 5 users. Display a suitable message" I tried out using both if / else and switch statements. They both work the same way, but what would be better to use for something like this in practice? To use if/else or switch? Because if they can both do the same thing is it just a matter of preference?


Here is my code

IF / ELSE 

Language: PHP
<?PHP
if (isset($_POST[';Submit1';])) {
 
$user1 = "user1";
$user2 = "user2";
$user3 = "user3";
$user4 = "user4";
$user5 = "user5";
 
$username = $_POST[';username';];
 
 
if ($username == $user1){
	print(';Welcome user1';);
}
else if($username == $user2){
	print(';Welcome user2';);
}
else if($username == $user3){
	print(';Welcome user3';);
}
else if($username == $user4){
	print(';Welcome user4';);
}
else if($username == $user5){
	print(';Welcome user5';);
}
 
else {
	print(';You are not a valid user';);
}
 
}
else {
$username ="";
}
 
?>


and SWITCH 

Language: PHP
<?PHP
if (isset($_POST[';Submit1';])) {
 
$username = $_POST[';username';];
 
 
switch ($username) {
 
	case "user1":
	print("Welcome user1");
	break;
 
	case "user2":
	print("Welcome user2");
	break;
 
	case "user3":
	print("Welcome user3");
	break;
 
	case "user4":
	print("Welcome user1");
	break;
 
	case "user5":
	print("Welcome user1");
	break;
 
	default:
	print("You are not a valid user");
 
}
 
}
else {
$username ="";
}
 
?>
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avatar
Mac
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 20, 2012 07:27AM
77570952-Sian Wrote:
-------------------------------------------------------
> I have completed this section, php4 - Working with
> HTML forms.
>
> For the last exercise where it asks "Suppose your
> web site has only 5 users. Create a HTML form to
> check if a visitor is one of the 5 users. Display
> a suitable message" I tried out using both if /
> else and switch statements. They both work the
> same way, but what would be better to use for
> something like this in practice? To use if/else or
> switch? Because if they can both do the same thing
> is it just a matter of preference?
>

http://www.ashishpaliwal.com/blog/2009/08/if-else-vs-switch-%E2%80%93-which-is-better/
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Gaia77490614
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 20, 2012 02:23PM
hm.... I'd say switch looks nice and neat when you have many "IF's" to do.


The Switch is also very nice to read - specifically to check between the 5 users. An If Else would look messy.

So mainly you use IF (maybe for 1 to 3 or 4 checks) , but when it is a longer list of things to check (like the 5 users) a Switch is more readable and also easier for you to find errors later on when looking at your code.


My view..
smiling smiley
But I know that over time it will become clear
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77592972_innocent
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 20, 2012 02:36PM
I have read this code thoroughly.
But what if i leave two spaces before typing username, would your code work.
Trim function is very important.
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77586182
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 20, 2012 07:30PM
I have completed this section.

Good point - 77592972 Innocent. Validation is very important when testing values from the user. I like the isset() function from php. Other languages use (variable == null) to check if variables have been set. Unfortunately space counts as a value and will validate true by the isset() function.
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77570952-Sian
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 20, 2012 08:37PM
thank you for link Mac.
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avatar
mm77509382
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 21, 2012 02:25PM
Regarding "How to validate checkboxes using javascript" (Tapan's script linked to in php4p11.html). 

Language: HTML
<input type=';checkbox'; name=';chkboxes'; value=';1';> 1<br>
<input type=';checkbox'; name=';chkboxes'; value=';2';> 2<br>
<input type=';checkbox'; name=';chkboxes'; value=';3';> 3<br>

The form on the sample uses the same 'name' attribute on each checkbox input. Does this not cause problems when reading $_POST?

I tested it out and it looks like only the value of the last checkbox of those that share a name is posted to php. So if you were to check, for example, both 2 and 3, only '3' would in fact end up in $_POST['chkboxes'].

Am I missing something or is the form setup in the example not ideal?
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avatar
Mac
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 21, 2012 03:03PM
Add two brackets after chkboxes to feed it into an array 

Language: PHP
<input type=';checkbox'; name=';chkboxes[]'; value=';1';> 1<br>
<input type=';checkbox'; name=';chkboxes[]'; value=';2';> 2<br>
<input type=';checkbox'; name=';chkboxes[]'; value=';3';> 3<br>
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avatar
mm77509382
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 22, 2012 10:33AM
mac Wrote:
-------------------------------------------------------
> Add two brackets after chkboxes to feed it into an
> array
>
> 
Language: PHP
> <input type=';checkbox'; name=';chkboxes[]';
> value=';1';> 1<br>
> <input type=';checkbox'; name=';chkboxes[]';
> value=';2';> 2<br>
> <input type=';checkbox'; name=';chkboxes[]';
> value=';3';> 3<br>
>

Cool. Good to know. Thanks smiling smiley
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77471466_Alwyn
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 22, 2012 01:37PM
mac Wrote:
-------------------------------------------------------
> Add two brackets after chkboxes to feed it into an
> array
>
> 
Language: PHP
> <input type=';checkbox'; name=';chkboxes[]';
> value=';1';> 1<br>
> <input type=';checkbox'; name=';chkboxes[]';
> value=';2';> 2<br>
> <input type=';checkbox'; name=';chkboxes[]';
> value=';3';> 3<br>
>

Was just thinking the same thing grinning smiley
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avatar
mm77509382
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 25, 2012 04:48PM
I've completed this section.
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franky71713913
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 25, 2012 07:53PM
Referring to this link: www.ashishpaliwal.com. I'm trying to figure out the code language,

System.out.println;

I've seen this exact coding in javascript, what is the difference with "javascript" and "php"?
I'm busy with the first exercise, and i'm battling a bit to understand the coding required to construct to display both first name and surname, and to allow it to function correctly?

Regards
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avatar
77553055
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 25, 2012 08:58PM
franky71713913 Wrote:
-------------------------------------------------------
> Referring to this link: www.ashishpaliwal.com. I'm
> trying to figure out the code language,
>
> System.out.println;
>
> I've seen this exact coding in javascript, what is
> the difference with "javascript" and "php"?
> I'm busy with the first exercise, and i'm battling
> a bit to understand the coding required to
> construct to display both first name and surname,
> and to allow it to function correctly?
>
> Regards


http://www.webmasterforums.com/php-development/15767-what-difference-between-php-javascript.html click on this link and read the post to know the difference between the two languages.
Read through this code in respect of your second question. 
Language: PHP
<?php
$First_Name = ';firstname';;
$Surname = ';surname';;
$Full_Name = $First_Name.'; ';. $Surname;
 
print (';My full name is';.'; ';.$Full_Name);
 
?>
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franky71713913
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 25, 2012 09:04PM
Thank you, 77553055 this is definitely helping me understand.smile
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77553055
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 25, 2012 09:06PM
you welcome Franky. Cheers!smileys with beer
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franky71713913
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 25, 2012 10:38PM
Cheers!! smileys with beer

I have found another web site that appears to have quite a lot on php: http://www.tizag.com/
It shows pages of the if/else statement, if statement, etc... with a bit of detail.

Regards
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77592972_innocent
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 27, 2012 11:35AM
Hi all

There is another way other than switch and if else statement 

Language: PHP
<?php
$name = "innocent";
echo $name == "innocent" ? "I love php" : "Couldn\';t be better";
?>

or 

Language: PHP
<?PHP
if (isset($_POST[';Submit1';])) {
 
$username = $_POST[';username';];
 
print ($username == "user1") ? "Welcome user1" : "";
print ($username == "user2") ? "Welcome user2" : ""; 
print ($username == "user3") ? "Welcome user3" : ""; 
print ($username == "user4") ? "Welcome user4" : ""; 
print ($username == "user5") ? "Welcome user5" : ""; 
}
?>

I stand to be correctly, just to illustrate the point.
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avatar
Mac
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 27, 2012 12:15PM
Yes. There are many shortcuts in PHP that you willl discover as you go along.
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L Dhladhla
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 27, 2012 09:25PM
Completed this section
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chaoscolony
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 28, 2012 08:53AM
this is so silly but i really have very limited time to explore php like most, just have time to work through course material, and make sure i understand it.
but i am finally at the end of PHP 4, and i played around with the code of a few examples.
and one was fun for i get to combine previous work a bit with new work 

Language: PHP
<html>
<head>
<title>A BASIC FORM IN HTML</title>
<?PHP
 
	$username=$_POST[';username';];
 
	if($username=="letmein"){
		print("welcome back, friend!");
	}
	else if($username==25){
		print("bonus code");
	}
	else{
		print("You';re not a member of this site");
	}
?>
 
</head>
<body>
 
	<FORM NAME="form1"METHOD="post"ACTION="basicForm.php">
 
		<INPUT TYPE="TEXT" VALUE="username"NAME="username">
		<INPUT TYPE="submit" Name="submit1" VALUE="Login">
`	
 
</body>
</html>

i just added an else if line of code into the example to play around with options
now i also get a response if enter a bonus code
drinking smiley sorry for adding such silly stuff, i really am just trying to contribute

maybe someone can give me a few extra interesting code to stuff in there to play around with different results
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franky71713913
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
February 29, 2012 10:48PM
i've tried it like this:
What am I doing wrong? I've tried and tried it, but I am lost on what I am missing 

Language: PHP
<html>
<head>
<title>Basic Form Exercise 1</title>
 
<?php
 
if(isset($_POST[';Submit2';])) {
 
$user = $_POST["username"];
 
$pass = $_POST["password"];
 
//* the list of users
 
$User1_name = ';seether';;
$User1_passw = ';jones';;
$user1 = $User1_name.'; ';. $User1_passw;
 
$User2_name = ';metallica';;
$User2_passw = ';baker';;
$user2 = $User2_name.'; ';. $User2_passw;
 
$User3_name = ';coldplay';;
$User3_passw = ';adam';;
$user3 = $User3_name.'; ';. $User3_passw;
 
$User4_name = ';rowland';;
$User4_passw = ';blue';;
$user4 = $User4_name.'; ';. $User4_passw;
 
$User5_name = ';moby';;
$User5_passw = ';october';;
$user5 = $User5_name.'; ';. $User5_passw;
 
// end of list
//Begin validation code 
 
if($username == "$user1"){
$validated = true;
}
 
else if($username == "$user2"){ 
$validated = true;
}
 
else if($username == "$user3"){ 
$validated = true;
}
 
else if($username=="$user4"){ 
$validated = true;
}
 
else if($username=="$user5"){ 
$validated = true;
}
 
//end validation code
 
if($validated){
print("welcome, $user.;
 
else{
 
print("invalid username/password combination, please try again.");
}
 
?>
 
 
</head>
<body>
 
<FORM name="form1" method="post" action="basicFormex1.php">
<input type="text" name="username" value="<?php print $username;?>">
<input type="password" name="password" value="<?php print $password;?>">
<input type="submit" name="Submit2" value="Display">
</FORM>
</body>
</html>
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avatar
Mac
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
March 01, 2012 06:46AM
elseif and not else if.
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77585607
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
March 01, 2012 06:00PM
I have completed this section. I found an interesting tutorial on the difference between the isset function and the empty function. Check it out at php-isset-vs-empty
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77592972_innocent
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
March 02, 2012 01:41PM
Hi

I see an example from franky71713913 but what if someone using his own form to post data.
How would you make sure that someone doesn't his form to post data?

Thanks
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franky71713913
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
March 02, 2012 09:18PM
I still seem to be receiving an error with the coding,
even after i have changed the else if to elseif, I have tried using other examples,

I am not sure what part of the form you are referring to 77592972_innocent,
but if you are talking about security of the form,
i think this site could have the answer you are referring to:


http://www.php.net/manual/en/security.variables.php

or:

http://www.php.net/manual/en/security.php

(if you want to see the list of security things)

I do hope that you find the answer to what your question is.
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franky71713913
Re: PHP Four - Working with HTML Forms - PHP and HTML Checkboxes
March 02, 2012 10:34PM
I have finally understood what i was doing wrong, i have put the brackets in the wrong place, and I have successfully got it to work. Here is a working simple validation of username & password:

<html>
<head>
<title>A BASIC HTML FORM with username & password validation</title> 
Language: PHP
<?PHP
 
if (isset($_POST[';Submit1';])) {
$username = $_POST[';username';];
 
$password = $_POST[';password';];
 
if ($username =="Letmein" && $password =="aeRials") {
print ("Welcome back, letmein!");
}
 
else if 
	($username =="gEorgia" && $password =="vIx") {
print ("Welcome back, gEorgia!");
	}
 
else if 
	($username =="Pieter" && $password =="piErs") {
print ("welcome back, pieter!");
	}
 
else if 
	($username =="Paul" && $password =="plIers") {
print ("welcome back, paul!");
	}
 
else if 
	($username =="Greg" && $password =="spanNer") {
print ("Welcome back, greg!");
	}
 
else if 
	($username =="Gary" && $password =="lOcknut") {
print ("Welcome back, gary!");
	}
 
else {
print ("You';re not a member of this site, please create a new profile!");
}
}
 
?>
</head>
<body>

<Form name ="form1" Method ="POST" Action ="basicFormex3.php">

<INPUT TYPE = "text" NAME ="username" VALUE ="<?php print $username ; ?>">
<INPUT TYPE = "password" NAME = "password" VALUE = "<?php print $password ; ?>">
<INPUT TYPE = "submit" NAME = "Submit1" VALUE = "Login">

</FORM>

</body>
</html>

And therefore, I have completed this section!
thumbs upsmile
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