CODEWITHSUNDEEP
php
newbie
newbie

Reputation: 14950

how can i input a validation PHP

Good day!

How can I produce an error if i input a letter instead of number because characters can still be encoded.... My code is as follows:

<HTML>
<BODY>

Please enter your grade (0-100 only):
<FORM ACTION="grade.php" METHOD="POST">
<table border = "1">
    <tr>
        <td>Grade</td>
        <td><input type="text" name="grade" /></td>
    </tr>
</table>
<INPUT type="submit" name="submit" value="grade status">
</FORM>
<?php

$grade = $_POST['grade'];
IF ($grade>=0 && $grade<=50){
    print "You failed";
} ELSE IF ($grade<=60){
    print "You Passed! But Study Harder!";
} ELSE IF ($grade<=70){
    print "Nice";
} ELSE IF ($grade<=80) {
    print "Great Job";
} ELSE IF ($grade<=90){
    print "Excellent";
} ELSE IF ($grade<=100){
    print "God Like!";
} ELSE {
    print "Invalid Grade!";
}   
?>

</BODY>
</HTML>

Upvotes: 0

Views: 284

Answers (4)

Sourav
Sourav

Reputation: 17520

Check the input text's ascii to see if it is number or not!

or use is_numeric($var);

Upvotes: 3

Vishal
Vishal

Reputation: 742

You can use regular expression

if (preg_match('/^[0-9]+$/', $str)) {

} else {

}

Upvotes: 0

bhavesh N
bhavesh N

Reputation: 787

Use javascript:

<script language="javascript">
function isInteger(s)
{   var i=document.s.grad.value;
    for (i = 0; i < s.length; i++)
    {
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) 
            {
alert("Must Enter Number");
            return false;
            }
    }
    // All characters are numbers.
    return true;
}

</script>

and call this function in form tab

<FORM ACTION="grade.php" METHOD="POST" onSubmint="isInteger(this)">

Upvotes: 1

Pascal MARTIN
Pascal MARTIN

Reputation: 401032

To check if something only contains digits, see the ctype_digit() function.

Upvotes: 1

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