PHP – Multiselect require field if option is selected [closed]

by

You could use Javascript which allows the validation on the front end and doesn’t require a page load, something like the following should work for you:

<head>
<script type="text/javascript">
function SelectValidator() {
  // Get the select object
  var index = document.getElementById("geographic").selectedIndex;
  var select = document.getElementById("geographic").options;

  // Get our input elements
  var county = document.getElementById('county');
  var state = document.getElementById('state');
  var zipcode = document.getElementById('zipcode');

  if (select[index].value === "county") {
    if (county.value === null || county.value === "") {
      alert("Please complete the County field");
    } else {
      alert("You could simply put a return statement here.");
    }
  } else if (select[index].value === "state") {
    if (state.value === null || state.value === "") {
      alert("Please complete the state field");
    } else {
      alert("You could simply put a return statement here.");
    }
  } else if (select[index].value === "zip") {
    if (zipcode.value === null || zipcode.value === "") {
      alert("Please complete the Zip Code field");
    } else {
      alert("You could simply put a return statement here.");
    }
  }
}
</script>
</head>

And your form:

<form>
<select multiple="multiple" name="geographic" id="geographic">
    <option value="state">State</option>
    <option value="county">County</option>
    <option value="zip">Zip Code</option>
</select>

<label for="state">What state?</label>
<input id="state" name="state" type="text">

<label for="county">What County?</label>
<input id="county" name="county" type="text">

<label for="zipcode">What is the Zip Code? *</label>
<input id="zipcode" name="zipcode" type="text">


<button type="button" onclick="SelectValidator()">Display index</button>
</form>

More Related Contents:

  1. Can’t return a result set in the given context
  2. PHP mail() issue
  3. Store ajax data to php
  4. in_array() and multidimensional array
  5. sudo in php exec()
  6. How do I convert an object to an array?
  7. Getter and Setter? [closed]
  8. Tracking the script execution time in PHP
  9. Unable to find the wrapper “https” – did you forget to enable it when you configured PHP?
  10. Adding one day to a date
  11. How do I give PHP write access to a directory?
  12. Posting raw image data as multipart/form-data in curl
  13. curl_exec() always returns false
  14. Checking if all the array items are empty PHP
  15. How to override trait function and call it from the overridden function?
  16. Expected response code 220 but got code “”, with message “” in Laravel
  17. Passing PHP variable into JavaScript [duplicate]
  18. What is PHP session_start()
  19. How to change PHP’s eregi to preg_match [duplicate]
  20. Storing database connection in a session variable [duplicate]
  21. Getting all dates for Mondays and Tuesdays for the next year
  22. Increase days to php current Date()
  23. php call class function by string name
  24. Extract floating point numbers from a delimited string in PHP
  25. PHP PDO how to run a multiple query request?
  26. How can i send an Email using PHP at windows Azure?
  27. PDO bindParam into one statement?
  28. How to make mysqli connect function?
  29. In PHP, is there an easy way to get the first and last date of a month?
  30. preg_match() vs strpos() for match finding?

Leave a Comment