I have a simple php calculator which code is:
<html>
<head>
<title>PHP calculator</title>
</head>
<body bgcolor="orange">
<h1 align="center">This is PHP Calculator</h1>
<center>
<form method="post" action="phptest.php">
Type Value 1:<br><input type="text" name="value1"><br>
Type value 2:<br><input type="text" name="value2"><br>
Operator:<br><input type="text" name="sign"><br>
Result:<br><input type"text" name="result">
<div align="center">
<input type="submit" name="submit" value="Submit">
</div>
</form>
</center>
<?php
if(isset($_POST['submit'])){
$value1=$_POST['value1'];
$value2=$_POST['value2'];
$sign=$_POST['sign'];
if($value1=='') {
echo "<script>alert('Please Enter Value 1')</script>";
exit();
}
if($value2=='') {
echo "<script>alert('Please Enter Value 2')</script>";
exit();
}
if($sign=='+') {
echo "Your answer is: " , $value1+$value2;
exit();
}
if($sign=='-') {
echo "Your answer is: " , $value1-$value2;
exit();
}
if($sign=='*') {
echo "Your answer is: " , $value1*$value2;
exit();
}
if($sign=='/') {
echo "Your answer is: " , $value1/$value2;
exit();
}
}
?>
All I want to do is that answer should be displayed in the result input field instead of echoing them separately. Please help? I Know it's simple but I am new in PHP.
One way to do it will be to move all the php code above the HTML, copy the result to a variable and then add the result in the <input> tag.
Try this -
<?php
//Adding the php to the top.
if(isset($_POST['submit']))
{
$value1=$_POST['value1'];
$value2=$_POST['value2'];
$sign=$_POST['sign'];
...
//Adding to $result variable
if($sign=='-') {
$result = $value1-$value2;
}
//Rest of your code...
}
?>
<html>
<!--Rest of your tags...-->
Result:<br><input type"text" name="result" value = "<?php echo (isset($result))?$result:'';?>">
inside the Form, You can use this code. Replace your variable name (i use $variable)
<input type="text" value="<?php echo (isset($variable))?$variable:'';?>">
Try this
<input class="qtytext-box" type="number" value= <?php echo $colll2; ?> >
Related
I am trying to get the user input and verify if the answer is correct using an if and statement. How do I prompt the user for input within the same webpage? This is the code I have so far.
<?php
$answer = //user input
if ($answer = "4") {
echo " “Correct!!!! Congratulations!";
} else {
echo "Your answer was blank but the correct answer is 4.";
}
?>
This is the full form view to let you know how to perform the basic form submit and get values and displaying the result
<?php
if(isset($_POST['submit']))
{
$answer=$_POST['answer'];
if ($answer == "4") {
echo " “Correct!!!! Congratulations!";
} else {
echo "Your answer was blank or wrong input but the correct answer is 4.";
}
}
?>
<html>
<body>
<form method="post" action="index.php">
<input type="number" name="answer">
<input type="submit" name="submit" value="Submit">
</form>
How can I create a form that accept number only?
<!DOCTYPE html>
<html>
<body>
<form method="post" action="<?php echo $_SERVER["PHP_SELF"];?>">
<label>x:</label><br>
<input type="text" name="xx" ><br>
<input type="submit" value="Submit">
</form>
<?php
if (isset($_POST['xx']) || !empty($_POST['xx']) || is_numeric($_POST['xx'])){
$x = $_POST['xx'];
}else{
echo "vous devez taper des chiffres!";
}
echo $x . "<br />";
?>
</body>
</html>
I am new in PHP please an easy answer.
Thank you :-)
If you only want to accept a number, you can also do so using the html element <input>.
Like this:
<input type= "number" name= "xx">
As a precaution, check the server-side $ _POST["xx"] element. Whether the element contains the expected values.
Like this:
check whether the element has been filled in and does not contain only white characters.
And remove any white space before and after the number using trim()
$xx = trim($_POST["xx"]);
if(!empty($xx) && is_numeric($xx)) {
// if "if-condition" true
} else {
// if "if-condition" false
}
I have this message if it is empty
enter image description here
<!DOCTYPE html>
<html>
<body>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"], ENT_QUOTES, "utf-8"); ?>">
<label>x:</label><br>
<input type="number" name="xx" ><br>
<input type="submit" value="Submit">
</form>
<?php
$value = trim($_POST["xx"]);
if(!empty($value) && is_numeric($value)) {
$xxx = $_POST['xx'];
} else {
echo "vous devez taper des chiffres!";
}
echo $xxx . "<br />";
?>
</body>
</html>
It is not an answer this, I don't know how to add code in the comment.
I'm creating a function for PHP form validation. The idea is that if a user has not filled out a required field (for example, if a $_POST variable called "name" is empty), then the user will be warned.
This function doesn't seem to work, however:
function addError($x) {
if (!$_POST["$x"]) {
$error.="Please enter your $x";
}
}
echo $error;
I've isolated the problem down to the passing of the argument $x into $_POST, i.e. this line:
if (!$_POST["$x"]) {
Specifically, $_POST["$x"]. Is this the right way/syntax to pass an argument?
Thank you!
Your code should be like -
$error = '';
function addError($x, $error) {
if (!$x) { // Check for the data
$error.="Please enter your $x"; // Concatenate the errors
}
return $error; // return the error
}
echo addError($_POST[$x], $error); // Pass the data to check & the error variable
Try this.....
<form method="post">
<input type="text" name="name" />
<input type="submit" value="submit" />
</form>
<?php
$x=$_POST["name"];
function addError($x)
{
if ($x==null)
{
$error="Please enter your name";
}
else
{
$error='';
}
return $error;
}
echo addError($x);
?>
Try this :-
$error = "";
function addError($x)
{
global $error;
if ("" == $_POST['"'.$x.'"'])
{
$error.="Please enter your".$x;
}
}
addError("name");
echo $error;
I referenced above two answers and write some code for this question. It works when I tested. You might get some idea for your coding.
Here is my tested code.
PHP section
<?php
function check_error($x){
$error = "";
if(isset($_POST[$x]) && $_POST[$x] == ""){
$error = "Please Enter Data";
}
return $error;
}
echo check_error('txt_name');
?>
HTML section
<!DOCTYPE html>
<html>
<head>
<title> Testing </title>
</head>
<body>
<h1> Testing </h1>
<hr/>
<form action="<?php echo $_SERVER['PHP_SELF'];?>" method="post">
<input type="text" name="txt_name" value="" placeholder="Your name" />
<input type="Submit" name="btn_submit" value="Submit" />
</form>
</body>
</html>
Make $error a global variable.
test.php
<?php
//CLICK SUBMIT BUTTON
if(isset($_POST['submit']))
{
$membername = $_POST['membername'];
$errors = '';
if(empty($membername))
{
$errors = "Please enter member name!<br />";
}
if($errors)
{
//MEMBER NAME TEXTFIELD EMPTY
//SHOW ERROR MESSAGE AND DISPLAY FORM AGAIN
echo '<span style="color:red;font-weight: bold;">'.$errors.'</span>';
displayForm();
}
else
{
//GO TO OUTPUT.PHP PAGE
header("Location:output.php");
exit();
}
}
else
{
displayForm();
}
?>
<?php
//DISPLAY FORM
function displayForm()
{
?>
<html>
<head></head>
<body>
<form action="test.php" method="post">
Member Name
<input type="text" name="membername" value="<?php if(isset($_POST['membername'])) echo $_POST['membername'];
else echo ''; ?>" /><br />
<input type="submit" name="submit" value="add" />
[HERE]
</form>
</body>
</html>
<?php
}
?>
In [HERE] section, I write the hidden input field:
<input type="hidden" name="mname" value="<?php echo $_POST['membername']; " />
After that, I go to output.php get the hidden field value:
<?php
echo $_POST['mname'];
?>
When I run the code, I get this error:
Undefined index: mname
What happened to my program?
header() function cannot applied to $_POST method?
Any solutions to solve it?
There Could be two solutions to get the value on redirected page :
1. By Session :
You can put the value in session and get on the redirected page.
$_SESSION['mname'] = $_POST['mname'];
2. Using GET :
You can send values in header.
header("Location:output.php?val=$_POST['mname']");
I have this piece of code and I want to show result in the third input box not in the input box and hole page and i want to know if i can a $_GET['$vairbles'] whiten functions
NOTE : I’m beginner in php programming
Here is my code :
<?php
$email = "mail#somedomain.com";
if (isset($_GET['txt1']) and isset($_GET['txt2'])) if (!empty($_GET['txt1']) and!empty($_GET['txt2'])) {
$tex1 = $_GET['txt1'];
$tex2 = $_GET['txt2'];
echo "They are all filled.<br>";
} else {
echo "Please fill in first and second Fields";
}
shwor();
Function shwor() {
global $email;
global $tex1;
global $tex2;
$len1 = strlen($tex1);
$len2 = strlen($tex2);
if ($len1 and $len2 > 0) if ($tex1 == $tex2) echo "matched ";
else echo "Does not match";
}
?>
<form action:"email.php" method="GET">
<input 1 type="text" name="txt1"><br><br>
<input 2 type="text" name="txt2"><br><br>
<input 3 type="text" name="Result" value = "<?php shwor();?>"><br><br>
<input type="submit" value="Check matches"><br>
</form>
everything works, just misspelled in this line:
<form action:"email.php" method="GET">
should be:
<form action="email.php" method="GET">
..and remember to name your file email.php that the data will be sent to the file itself ;-)