Changing Select Element Content (two Combobox) : Option Select ComboBox « Form Control « JavaScript DHTML






  1. JavaScript DHTML
  2. Form Control
  3. Option Select ComboBox

Changing Select Element Content (two Combobox)

   
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
  "http://www.w3.org/tr/xhtml1/DTD/xhtml1-transitional.dtd">
<!-- 
     Example File From "JavaScript and DHTML Cookbook"
     Published by O'Reilly & Associates
     Copyright 2003 Danny Goodman
-->
<html>
<head>
<title>Recipe 8.13</title>
<style rel="stylesheet" id="mainStyle" type="text/css">
html {background-color:#cccccc}
body {background-color:#eeeeee; font-family:Tahoma,Arial,Helvetica,sans-serif; font-size:12px;
    margin-left:15%; margin-right:15%; border:3px groove darkred; padding:15px}
h1 {text-align:right; font-size:1.5em; font-weight:bold}
h2 {text-align:left; font-size:1.1em; font-weight:bold; text-decoration:underline}
.buttons {margin-top:10px}

</style>
<script type="text/javascript">

var regiondb = new Object()
regiondb["africa"] = [{value:"102", text:"Cairo"},
                      {value:"88", text:"Lagos"},
                      {value:"80", text:"Nairobi"},
                      {value:"55", text:"Pretoria"}];
regiondb["asia"] = [{value:"30", text:"Ankara"},
                    {value:"21", text:"Bangkok"},
                    {value:"49", text:"Beijing"},
                    {value:"76", text:"New Delhi"},
                    {value:"14", text:"Tokyo"}];
regiondb["australia"] = [{value:"64", text:"Suva"},
                          {value:"12", text:"Sydney"}];
regiondb["europe"] = [{value:"11", text:"Athens"},
                      {value:"35", text:"Frankfurt"},
                      {value:"3", text:"London"},
                      {value:"15", text:"Madrid"},
                      {value:"1", text:"Paris"},
                      {value:"10", text:"Rome"},
                      {value:"6", text:"Stockholm"},
                      {value:"97", text:"St. Petersburg"}];
regiondb["noamer"] = [{value:"73", text:"Dallas"},
                      {value:"71", text:"Los Angeles"},
                      {value:"5", text:"New York"},
                      {value:"37", text:"Toronto"}];
regiondb["soamer"] = [{value:"65", text:"Buenos Aires"},
                      {value:"31", text:"Caracas"},
                      {value:"66", text:"Rio di Janeiro"}];

function setCities(chooser) {
    var newElem;
    var where = (navigator.appName == "Microsoft Internet Explorer") ? -1 : null;
    var cityChooser = chooser.form.elements["city"];
    while (cityChooser.options.length) {
        cityChooser.remove(0);
    }
    var choice = chooser.options[chooser.selectedIndex].value;
    var db = regiondb[choice];
    newElem = document.createElement("option");
    newElem.text = "Choose a City:";
    newElem.value = "";
    cityChooser.add(newElem, where);
    if (choice != "") {
        for (var i = 0; i < db.length; i++) {
            newElem = document.createElement("option");
            newElem.text = db[i].text;
            newElem.value = db[i].value;
            cityChooser.add(newElem, where);
        }
    }
}

/**********
  DOM LEVEL 0 ALTERNATE
 **********
function setCities(chooser) {
    var cityChooser = chooser.form.elements["city"];
    // empty previous settings
    cityChooser.options.length = 0;
    // get chosen value to act as index to regiondb hash table
    var choice = chooser.options[chooser.selectedIndex].value;
    var db = regiondb[choice];
    // insert default first item
    cityChooser.options[0] = new Option("Choose a City:", "", true, false);
    if (choice != "") {
        // loop through array of the hash table entry, and populate options
        for (var i = 0; i < db.length; i++) {
            cityChooser.options[i + 1] = new Option(db[i].text, db[i].value);
        }
    }
}
**********/
</script>
</head>
<body>
<h1>Changing Select Element Content</h1>
<hr /> 
<form name="dealers" ...>
...
Submit Request to: <select name="continent" onchange="setCities(this)">
    <option value="" selected>Choose a Region:</option>
    <option value="africa">Africa</option>
    <option value="asia">Asia</option>
    <option value="australia">Australia/Pacific</option>
    <option value="europe">Europe</option>
    <option value="noamer">North America</option>
    <option value="soamer">South America</option>
</select>&nbsp;
<select name="city">
    <option value="" selected>Choose a City:</option>
</select>
...
</form>
</body>
</html>








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