[RESOLVED] If Isset else issue

[dmacman1962]

Hi all,

I am having an issue with my loop. I am getting an invalid argument if the user does not select a checkbox, and I don't understand why. Here is my code.

foreach ($_POST['GradeLevel'] as $grade) {
   if (isset($grade)) {
      $grade; // now this will contain the value from the input
                    // if you echo ($grade); then it will display a list of the selected grades
					echo "<br<br>".$grade."<br><br>"."_____";
   	} else {
   echo "You did not select a Grade Level Taught. Please hit the back button and choose a Grade Taught.";  

	}
}

Thanks,

Don

[harmor]

I'm not sure what all is happening but try replacing
if (isset($grade)) {

With
if ($grade) {

[thorpe]

no need to check each array element, they simply wont be created if they dont exist. you want to check the array exists though...

if (isset($_POST['GradeLevel'])) {
    foreach ($_POST['GradeLevel'] as $grade) {
        echo "<br<br>".$grade."<br><br>"."_____";
    }
} else {
    echo "You did not select a Grade Level Taught. Please hit the back button and choose a Grade Taught.";
}

[dmacman1962]

Hi harmor,

I did what you suggested and I still get an error if no checkboxes are selected:

Warning: Invalid argument supplied for foreach() in /home/inthecla/public_html/tests/testpost2.php on line 10

Here is the form code:

<form action="testpost2.php" method="POST" target="_self" onSubmit="">
  <label>Grades Taught
  <br />
  7th Grade
  <input type="checkbox" name="GradeLevel[]" value="1">
  <br />
  8th Grade
  <input type="checkbox" name="GradeLevel[]" value="2">
  <br />
  9th Grade
  <input type="checkbox" name="GradeLevel[]" value="3">
  </label>
  <p>
    <label>Submit
    <input type="submit" name="Submit" value="Submit" />
    </label>
  </p>
</form>

And here is the php code to process it.

foreach ($_POST['GradeLevel'] as $grade) {
   if ($grade) {
      $grade; // now this will contain the value from the input
                    // if you echo ($grade); then it will display a list of the selected grades
		echo "<br<br>".$grade."<br><br>"."_____";
   } 
}

Thanks ina advance,
Don

[Weedpacket]

If no checkboxes are selected then there is no $_POST['GradeLevel'] element - and it certainly isn't an array. You need to check this before trying to use it.

Somewhere appropriate (before the loop) you could write

if(!isset($_POST['GradeLevel'])) $_POST['GradeLevel'] = array()

so that the element is an (empty) array.

[dmacman1962]

Tank you master, I am but student!!

I got it now weedpacket.

Here is what I got to work with your suggestion:

 if(!isset($_POST['GradeLevel'])) { // You did not select any boxes
 	$_POST['GradeLevel'] = array();// Make it an array
     echo "You did not select a Grade Level Taught. Please hit the back button and choose a Grade Taught.";  // Go back
} else {
foreach ($_POST['GradeLevel'] as $grade) { //Set the elements in the array
        echo "<br<br>".$grade."<br><br>"."_____"; // display them one at a time
   	 }
}

Now I will work on taking each element in the array (which I am still learning how to use, but not to your level apparently) and send them to the databas one at a time.

(Any suggestions here 🙂 )

My variables are named

$GradeLevel8

$GradeLevel9

etc.

I put this after the foreach and it only gives me the 1st checkbox value and they need to be able to select multiple checkboxes. So I need to get all the values at once..

//test array code
	   if ($grade = "Grade 7") {
	   $GradeLevel7 = $grade;
	   } elseif ($grade = "Grade 8") {
	   $GradeLevel8 = $grade;
	   } elseif ($grade = "Grade 9") {
	   $GradeLevel9 = $grade;
	   } elseif ($grade = "Grade 10") {
	   $GradeLevel10 = $grade;
	    } elseif ($grade = "Grade 11") {
	   $GradeLevel11 = $grade;
	    } elseif ( $grade = "Grade 12") {
	   $GradeLevel12 = $grade;
	   }
//end test array code

Thanks,

Don

[dmacman1962]

I resolved this, with weedpackets guidance.

New code:

if(!isset($_POST['GradeLevel'])) { // You did not select any boxes
 	$_POST['GradeLevel'] = array();// Make it an array
    die("<p align='center'><font face='Arial' size='3' color='#FF0000'>You did not select a Grade Level Taught. <br>Please hit the back button and choose a Grade Taught.</font></p>");  // Go back
} else {
foreach ($_POST['GradeLevel'] as $grade) { //Set the elements in the array
	$GradeLevel7 = $grade[0];
	$GradeLevel8 = $grade[1];
	$GradeLevel9 = $grade[2];
	$GradeLevel10 = $grade[3];
	$GradeLevel11 = $grade[4];
	$GrageLevel12 = $grade[5];
   	 }
} 

Then I insert those values:

$sql .="values('$GradeLevel[0]', '$GradeLevel[1]', '$GradeLevel[2]', '$GradeLevel[3]', '$GradeLevel[4]', '$GradeLevel[5]') 

into my db.

Thanks a bunch!

Don

[Weedpacket]

Glad to see you've got it going. One thing I'll point out is that I assumed that you still wanted to proceed even if no checkboxes were selected, so I put the $_GET['GradeLevel']=array() assignment in to prevent its absence causing problems further down.

Since in fact you're stopping if there weren't any checkboxes, the assignment is no longer necessary.