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Thread: Validate dynamically populated select menu

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  1. #1
    Join Date
    Feb 2013

    Validate dynamically populated select menu

    After the user selects a country, it populates and displays a select menu with the states from the populate.php page. After the new populated select menu is displayed i want to check to make sure the user has made a selection before submitting the form. Currently i am only changing the background colour but i cant get the message to display, nor can i stop it from submitting before the information is correct. Any help would b appreciated. Thank you.

    Here is my code:
    Validate.php page

    <!doctype html>
    <html lang="en">
    <meta charset="utf-8">
    <script type="text/javascript">
    //function to populate menu
    // when any option from country list is selected

    // get the selected option value of country
    var optionValue = jQuery("select[name='country']").val();
    .load('populate.php', {country: optionValue, status: 1}, function(response){
    if(response) {
    jQuery("#cityAjax").css('display', '');
    } else {
    jQuery("#cityAjax").css('display', 'none');

    // Validate Select boxes
    function validateSelect(x){
    if(document.getElementById(x).selectedIndex !== 0){
    document.getElementById(x).style.background ='#ccffcc';
    document.getElementById(x + 'Error').style.display = "none";
    return true;
    document.getElementById(x).style.background ='#e35152';
    document.getElementById(x + 'Error').style.display = "block";
    return false;

    function validateForm(){
    // Set error catcher
    var error = 0;
    // Validate city dropdown box
    document.getElementById('cityError').style.display = "block";
    // Don't submit form if there are errors
    if(error > 0){
    return false;

    <div id="cityAjax" style="display:none">
    <div class="slAdd1a">Parish:</div>
    <div class="slAdd1b">
    <label for="city"></label>
    <select name="city" id="city" onblur="validateSelect(name)">
    <option value="">--Select a State--</option>
    <span class="validateError" id="animalError" style="display: none;">You must select a state</span>
    <div class="slAdd1">
    <div class="slAdd1a">Country:</div>
    <div class="slAdd1b"><span id="sprycountry">
    <label for="country"></label>
    <select name="country" id="country">
    <option value="" selected="selected">Please Select</option>
    <option value="Russia">Russia</option>
    <option value="England">England</option>
    <span class="selectInvalidMsg">Please select a valid item.</span><span class="selectRequiredMsg">Please select an item.</span></span></div>

    And the second page
    populate.php page

    $country = $_POST['country'];

    if(!$country) {
    return false;

    $cities = array(
    "Russia" => array('Russian State'),
    "England" => array('English State'),
    $currentCities = $cities[$country];

    <div id="cityAjax">
    <div class="slAdd1a">Parish:</div>
    <div class="slAdd1b">
    <label for="city"></label>
    <select name="city" id="city" onblur="validateSelect(name)">
    <option value="">--Select a State--</option>
    foreach($currentCities as $city) {
    <option value="<?php echo $city; ?>"><?php echo $city; ?></option>
    <span class="validateError" id="cityError" style="display: none;">You must select State</span></div></div>

  2. #2
    Join Date
    Mar 2009
    Wherever i lay my hat
    What form? I don't see any <form> tag. If there was one, you could add an event listener, such as

    $( "form" ).submit( function() {
    var result = true;
    //do your validation here and if it doesn't pass, assign result = false
    //returning false prevents the form from submitting
    return result;
    } );
    also, you have no title tag in head and next time, wrap your code between [ code] [ /code] tags to increase readability

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