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POHow to display AJAX results in a HTML drop down menu
 

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  1. POHow to display AJAX results in a HTML drop down menu
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    <p>I am creating a few drop down menus that populate depending on the previous drop down value selected.</p> <p>So far I am able to successfully use ajax to grab data from the php script, however, I am not sure how to append that data to the second drop down called AREAS.</p> <pre><code>HTML / Javascript / AJAX &lt;html&gt; &lt;head&gt; &lt;title&gt;IPSLA Report&lt;/title&gt; &lt;script type="text/javascript"&gt; function changeSelections() { var departments = document.selections.department; var areas = document.selections.areas; var months = document.selections.months; var years = document.selections.years; var s = document.getElementById("department"); switch(departments.selectedIndex) { case 0: areas.options.length = 0; months.options.length = 0; years.options.length = 0; areas.options[0] = new Option("Select an Area"); months.options[0] = new Option("Select a Month"); years.options[0] = new Option("Select a Year"); departments.options[0].selected = true; break; default: months.options.length = 0; years.options.length = 0; months.options[0] = new Option("Select a Month"); years.options[0] = new Option("Select a Year"); var pass = s.options[s.selectedIndex].text; ajaxFunction(pass); } } function ajaxFunction(pass) { var ajaxRequest; try { ajaxRequest = new XMLHttpRequest(); } catch(e) { try { ajaxRequest = new ActiveXObjext("Msxml2.XMLHTTP"); } catch(e) { try { ajaxRequest = new ActiveXObjext("Microsoft.XMLHTTP"); } catch(e) { alert("Please use another browser"); return false; } } } ajaxRequest.onreadystatechange = function() { if (ajaxRequest.readyState == 4) { var ajaxDisplay = document.getElementById("areas"); if (ajaxDisplay != null) { ajaxDisplay.options.selectedIndex.text = ajaxRequest.responseText; } else { document.write("NULL!!!"); } } } if (pass == "CRAN") { var active_id = '0'; } var queryString = "?active_id=" + active_id; ajaxRequest.open("GET","db_connect.php" + queryString, true); ajaxRequest.send(null); } &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;div id="wrapper"&gt; &lt;div id="select"&gt; &lt;form name="selections" id="selections" action=""&gt; &lt;select name="department" id="department" onChange="changeSelections()"&gt; &lt;option value="none"&gt;Select Department&lt;/option&gt; &lt;option value="none"&gt;CRAN&lt;/option&gt; &lt;option value="none"&gt;BackBone&lt;/option&gt; &lt;option value="none"&gt;Datacenter&lt;/option&gt; &lt;option value="none"&gt;Enterprise&lt;/option&gt; &lt;/select&gt; &lt;select name="areas" id="areas" onChange="changeMonth()"&gt; &lt;option value="none"&gt;Select an Area&lt;/option&gt; &lt;/select&gt; &lt;select name="months" id="months" onChange="changeYear()"&gt; &lt;option value="none"&gt;Select a Month&lt;/option&gt; &lt;/select&gt; &lt;select name="years" id="years" onChange="go(this)"&gt; &lt;option value="none"&gt;Select a Year&lt;/option&gt; &lt;/select&gt; &lt;/form&gt; &lt;/div&gt; &lt;div id="image"&gt; &lt;/div&gt; &lt;div id="incidents"&gt; &lt;/div&gt; &lt;/div&gt; &lt;/body&gt; &lt;/html&gt; PHP Script &lt;?php $host = ""; $dbName = ""; $username = ""; $password = ""; $conn = mysql_connect($host,$username,$password); $db = mysql_select_db($dbName,$conn); $dept_id = $_GET['id']; $area_query = "SELECT area_name FROM incident_area WHERE FK_dept= '$dept_id'"; $area_result = mysql_query($area_query); $options = ""; while ($area_row = mysql_fetch_assoc($area_result)) { #$options .= '&lt;option value="'.$area_row['area_name'].'"&gt;'.$area_row['area_name'].'&lt;/option&gt;'; $options .= $area_row['area_name']; } echo $options; ?&gt; ~ </code></pre> <p>So, basically I just need to know how to append the values gathered by AJAX to the drop down menu "areas".</p>
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    1. COno raw `XMLHttpRequest`, strongly recommended jQuery.
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    2. CO@SiweiShen - What is the equivalent in jQuery? Resource that you could point me to?
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    3. COgoogle its official website, there are lots of documents. see : http://api.jquery.com/jQuery.ajax/ . first of all, check out how its 'selector' works, then ,checkout its 'ajax' methods. very simple.
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