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AJAX - PHP to Javascript Multi Array and Split

New to JSON/AJAX here but trying...
PHP page appears to be returning [{"id":"1"},{"id":2}] to my javascript.
How would I convert it to something useful like a dropdown in html?
Code:
<script>
function show(str) {
if (str=="") {
var ajaxDisplay=xmlhttp.responseText;
var res=ajaxDisplay.split("#");
document.getElementById("ajax1").innerHTML=res[1];
return;
}
if (window.XMLHttpRequest) {
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
} else { // code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4 && xmlhttp.status==200) {
var ajaxDisplay=xmlhttp.responseText;
var res=ajaxDisplay.split("#");
document.getElementById("ajax1").innerHTML=res[0];
}
}
xmlhttp.open("GET","get.php?q="+str,true);
xmlhttp.send();
}
</script>
<div id='ajax1'><b>ID dropdown will be listed here.</b></div>

I am not sure why you declared the variables twice, but I think this may help If you are asking what I think.
function showUser(fo,to)
{
if (fo=="")
{
document.getElementById("show").innerHTML="";
return;
}
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
var arr=xmlhttp.responseText.split(":||:");//I used this as the delimiter
document.getElementById('show').innerHTML=arr[0];
document.getElementById('show1').innerHTML=arr[1];
}
}
xmlhttp.open("GET","some.php?q="+ fo + "&w=" + to,true);
xmlhttp.send();
}
And the php side is different than normal, you;ll need something like this.
if (!$result=mysqli_query($con,$sql))
{
die('Could not get data: ' . mysqli_error($sql));
}
$test=mysqli_fetch_all($result,MYSQLI_ASSOC);//this was key to fetching the array properly for display
$length=count($test);
$half_length=$length/2;
//echo $half_length."<br />";/used for testing
$test12=array_chunk( $test,$half_length+.5,false);//here use true to preserve keys, worked both ways for me
$test5=$test12[0];
$test6=$test12[1];
while(list($key,$val)=each($test5))
{
echo "<p>".$val[$colunm_name]."<p/><br />";//Here you can put in the tags you want and will list your array in the format you want
}
echo ":||:";//Make sure the delimiter is out of the loop
while(list($key2,$val2)=each($test6) )
{
echo "<p>".$val[$colunm_name]."<p/><br />";//Here you can put in the tags you want
//echo "result_count_".count($test)."_-st<br/>";//used for testing
Took me a while to get this, I hope it helps.

Javascript "getElementsByClassName" not working

I have a website with a picture of a tree, I have then used Ajax to remove that tree and insert a number using javascript. What I used for that was;
document.getElementById("cut_oak_tree");
I have now added another tree on the page, which should have the exact same function as the first tree, except that only the tree that you clicked on, shall be removed. To avoid duplicating code, I have tried adding following:
document.getElementsByClassName("cut_oak_tree");
and then changed my div from using id to class. However, nothing happens when I click any of the trees now. My current ajax code right now, looks like this:
function loadXMLDoc()
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
var getClass = document.getElementsByClassName("cut_oak_tree").innerHTML=xmlhttp.responseText;//ask for this.
for(i=0;i<getClass.length;i++)
{
getClass[i].innerHTML = "";
}
}
}
xmlhttp.open("POST","xxx",true);
xmlhttp.send();
}
I have been searching a lot and found that I might need to use a for loop together with the document.getElementsByClassName("cut_oak_tree");
but I can't really get that to work. If I have figured my problem correctly, everything should be good if I could just determine which of the tree images in the div should be removed when it's pressed. Thanks in advance.
EDIT:
Html sample:
<div id "thanks">
<img class="cut_oak_tree" src="http://www.pbpixels.com/x/images/oak.png" onclick="loadXMLDoc(), myFunction()">
<img class="cut_oak_tree" src="http://www.pbpixels.com/x/images/oak.png" onclick="loadXMLDoc(), myFunction()">
</div>

Try the following:
document.getElementsByClassName("cut_oak_tree")[0];
If you want to apply changes to more than one elements with classname cut_oak_tree then you will have to use for loop
var getClass = document.getElementsByClassName("cut_oak_tree");
for(i=0;i<getClass.length;i++)
{
getClass[i].innerHTML = "";
}
Using your earlier HTML with slight modifications you can do the following:
HTML
<div class="cut_oak_tree">
<img src="http://www.pbpixels.com/x/images/oak.png" onclick="loadXMLDoc(this.outerHTML), myFunction()" />
<img src="http://www.pbpixels.com/x/images/oak.png" onclick="loadXMLDoc(this.outerHTML), myFunction()" />
</div>
Hence change your JS function to :
function loadXMLDoc(h)
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
var getEle = document.getElementsByClassName('cut_oak_tree')[0];
getEle.innerHTML = getEle.innerHTML.replace(h,xmlhttp.responseText);
}
}
xmlhttp.open("POST","http://www.pbpixels.com/x/post.php",true);
xmlhttp.send();
}
Demo Fiddle
Response to comment:
Inorder to uniquely identify clicked <img>s with same images just make minor change to the one of the img srcs from the two.Example give space within src src="http://www.pbpixels.com/x/images/oak.png ".Note the space after .png which will make the difference between the two

I would think that the most straightforward way to do it would be to pass the clicked element into the loadXMLDoc() as a parameter, and then get the parent of that element. Something like this:
HTML
<div id="cut_oak_tree">
<img src="http://www.pbpixels.com/x/images/oak.png" onclick="loadXMLDoc(this), myFunction()">
<img src="http://www.pbpixels.com/x/images/oak.png" onclick="loadXMLDoc(this), myFunction()">
</div>
JS
function loadXMLDoc(clickedElement) {
var xmlhttp;
if (window.XMLHttpRequest) { // code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else { // code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState==4 && xmlhttp.status==200) {
clickedElement.parentNode.innerHTML = xmlhttpinnerHTML = xmlhttp.responseText; //ask for this.
}
}
xmlhttp.open("POST","xxx",true); //the xxx's represent my website
xmlhttp.send();
}
NOTE: I'm not 100% sure that I have the logic right, since you changed your original post, while I was typing up my answer. :)
UPDATE #2: I found the original code in the edit history . . . my code should be correct now.

multiple ajax calls using only javascript

isn't it possible to execute multiple ajax calls using javascript only and without using Jquery. I tried the below javascript code with two ajax calls but the code is not working when I place the second ajax call
<script type="text/javascript">
var class1;
var class2;
var sec1;
var sec2;
function func()
{
class1 = document.getElementById('selcla');
class2 = class1.options[class1.selectedIndex].value;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("secdiv").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","getsec.php?q="+class2,true);
xmlhttp.send();
}
function funcsec()
{
sec1 = document.getElementById('selsec');
sec2 = sec1.options[sec1.selectedIndex].value;
alert("selecting class and section details " + class2 + " " + sec2 );
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
alert("successfully received " );
document.getElementById("studiv").innerHTML=xmlhttp.responseText;
}
else
alert("unsuccessful ajax second call ");
}
xmlhttp.open("GET","getstu.php?x="+class2"&y="+sec2,true);
xmlhttp.send();
}

It is, but you need a different "xmlhttp" handler for each request you make.
Setup a new xmlhttp object and make a second request with the new object.
My suggestion is to break out the part with you initializing the xmlhttp object, into a standalone function, and use it to create a few instances of those objects.
However I must advise against such an approach. It is better to use a library for ajax requests.

Automatically pass the retrieved value from a javascript function to another javascript function?

I have two inline java script functions, one intended to get a token value using xhr and second one will use that value to get the full response from server. But when i uploaded the same on server nothing happened.
Here goes the sample code:
function getUser(user)
{
var xmlhttp;
var result,x,i;
var uservalue=user;
var url="http://abc.xyz.com:8090/uauth/" +uservalue;
///here starts the getToken method..
var tokensave=function getToken(uservalue)
{
var xmlhttp;
var token,a,b;
var url="http://abc.xyz.com:8090/uauth/" +uservalue;
var data="op=login&pass=" +uservalue;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
if (xmlhttp==null)
{
alert ("Browser does not support HTTP Request");
return;
}
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.open("POST",url, true);
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
xmlDoc=xmlhttp.responseXML;
token="";
a=xmlDoc.getElementsByTagName("token");
token=token + a.childNodes.nodeValue;
document.getElementById("myDiv").innerHTML=token;
}
};
xmlhttp.setRequestHeader("Content-Type", "text/xml");
xmlhttp.send(data);
return token;
}
var header="Xyz-Authorization: "+tokensave;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
if (xmlhttp==null)
{
alert ("Browser does not support HTTP Request");
return;
}
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.open("GET",url, true);
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
xmlDoc=xmlhttp.responseXML;
result="";
x=xmlDoc.getElementsByTagName("response");
for (i=0;i<x.length;i++)
{
result=result + x[i].childNodes[0].nodeValue + "<br />";
}
document.getElementById("myNewDiv").innerHTML=result;
}
};
xmlhttp.setRequestHeader("Xyz-Authorization: ", +tokensave);
xmlhttp.send();
}
HTML CODE:
<div id="myDiv"></div>
<br />
<br />
<div id="myNewDiv"></div >
<br />
<form>
<input name="textbox" id="textbox" type="text" />
<input name="buttonExecute" onclick="getUser(document.getElementById('textbox').value)" type="button" value="Get User" />
</form>
What's wrong with this apparoach?
Thanks in advance for your valuable help...
mrana

You need to use a return token in the first function and use it like this getUser(getToken(user))

Just create a global variable, and you set change the value inside de function but it's still accesible from a global scope for all the functions you want.
var data = false;
function getData() {
// some ajax...
data = {cool:true};
}
function foo () {
if(data.cool) {
alert (data.cool)
}
}

Dynamically populate dynamically created select list

I'm having a bit of difficulty here; I am using js to dynamically create select boxes, but I need Ajax to fill them with options. So far, my code is returning undefined, and I frankly don't know what to do here. My php returns the info fine, but the js isn't parsing it. Another set of eyes, or another brain full of knowledge would be appreciated here;
function getSkilllist(group) {
if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else {// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4 && xmlhttp.status==200) {
return xmlhttp.responseText;
}
}
xmlhttp.open("GET","skl_lst_gen2.php?group=" + group + "&t=" + Math.random(),true);
xmlhttp.send();
}
function addInput(divName,group) {
var skillst = getSkilllist(group);
var newdiv = document.createElement('div');
newdiv.innerHTML = '<select name="ski[]">' + skillst + '</select> .....
The rest of the function is fine, but the var skillst is returning undefined as stated, and I can't figure out why. I assume it has something to do with strings, but I can't figure out what needs to be done.

Your function does not return anything, which is why it isn't working. Try this:
function getSkilllist(group) {
if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else {// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function() {
if (xmlhttp.readyState==4 && xmlhttp.status==200) {
var newdiv = document.createElement('div');
newdiv.innerHTML = '<select name="ski[]">' + xmlhttp.responseText + '</select> .....
//place in DOM here
}
}
xmlhttp.open("GET","skl_lst_gen2.php?group=" + group + "&t=" + Math.random(),true);
xmlhttp.send();
}
function addInput(divName,group) {
getSkilllist(group);