CODEWITHSUNDEEP
javascriptphpjqueryhtmlvalidation
Aniket Singh
Aniket Singh

Reputation: 877

How to check for duplicate value in Select options

I have 6 Select input fields and all the 6 input fields have same options value, but i want that each of select input value should be unique for e.g

Input 5 and Input 6 are optional input field but if they are filled then they should be validated for unique value

Input1   Input2   Input3  Input4   Input5  Input6   

value1   value1   value1  value1   value1  value1
value2   value2   value2  value2   value2  value2
value3   value3   value3  value3   value3  value3

Now if user selected value1 in Input1 then he can't choose value1 in other select fields

I know i can do it using if elseif else but it will not be that professional, is there a better way of validating it.

Upvotes: 0

Views: 79

Answers (2)

Casper S
Casper S

Reputation: 954

This is something I came up with, but it is not the best way of doing this.

<?php
if ($_POST) {
    $data = [];
    $data[] = $_POST['Input1'];
    $data[] = $_POST['Input2'];
    $data[] = $_POST['Input3'];
    $data[] = $_POST['Input4'];

    //optional values
    if ("" == trim($_POST['Input5'])) {
        $data[] = $_POST['Input5'];
    }
    if ("" == trim($_POST['Input6'])) {
        $data[] = $_POST['Input6'];
    }

    //count post elements
    $count = count($data);

    // get unique elements from array
    $result = array_unique($data);

    if (count($result) !== $count) {
        echo 'Duplicated data';
    } else {
        echo 'All are unique';
    }
}

I think a better solution would be to look into some Javascript Validators

Don't Reinvent The Wheel, Unless You Plan on Learning More About Wheels

Upvotes: 1

Naincy
Naincy

Reputation: 2943

Take all input of fields in one variable, and then get only unique values.

Please see below. This will help.

if ($_POST) {
  $validate_data = [];
  $is_valid = FALSE; 
  $validate_data[] = $_POST['Input1'];
  $validate_data[] = $_POST['Input2'];
  $validate_data[] = $_POST['Input3'];
  $validate_data[] = $_POST['Input4'];

  // get unique elements from array
  $result = array_unique($validate_data);
  // if array size is equal to no of input fields then means all are unique
  // else it has duplicate values
  if (count($result) != 4 ) {
     $is_valid = FALSE;
  } else {
     // Validate optional fields
     if (isset($_POST['Input5']) && in_array($_POST['Input5'], $result)) {
         $is_valid = FALSE;
      } else if (isset($_POST['Input6']) && in_array($_POST['Input6'], $result)) {
         $is_valid = FALSE;
      } else {
         $is_valid = TRUE;
      }
  }

  echo ($is_valid) ? 'All are unique.' : 'Invalid Data';
}

Upvotes: 1

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