function form_validate_number

Form element validation handler for #type 'number'.

Note that #required is validated by _form_validate() already.

Related topics

Form generation
Functions to enable the processing and display of HTML forms.
2 string references to 'form_validate_number'
number_field_instance_settings_form in drupal/core/modules/field/modules/number/number.module
Implements hook_field_instance_settings_form().
system_element_info in drupal/core/modules/system/system.module
Implements hook_element_info().

File

drupal/core/includes/form.inc, line 4154
Functions for form and batch generation and processing.

Code

function form_validate_number(&$element, &$form_state) {
  $value = $element['#value'];
  if ($value === '') {
    return;
  }
  $name = empty($element['#title']) ? $element['#parents'][0] : $element['#title'];

  // Ensure the input is numeric.
  if (!is_numeric($value)) {
    form_error($element, t('%name must be a number.', array(
      '%name' => $name,
    )));
    return;
  }

  // Ensure that the input is greater than the #min property, if set.
  if (isset($element['#min']) && $value < $element['#min']) {
    form_error($element, t('%name must be higher or equal to %min.', array(
      '%name' => $name,
      '%min' => $element['#min'],
    )));
  }

  // Ensure that the input is less than the #max property, if set.
  if (isset($element['#max']) && $value > $element['#max']) {
    form_error($element, t('%name must be below or equal to %max.', array(
      '%name' => $name,
      '%max' => $element['#max'],
    )));
  }
  if (isset($element['#step']) && strtolower($element['#step']) != 'any') {

    // Check that the input is an allowed multiple of #step (offset by #min if
    // #min is set).
    $offset = isset($element['#min']) ? $element['#min'] : 0.0;
    if (!valid_number_step($value, $element['#step'], $offset)) {
      form_error($element, t('%name is not a valid number.', array(
        '%name' => $name,
      )));
    }
  }
}