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.
Related
I'm working in an app and I was catching all the ajax request using:
$(document).ajaxComplete(function (xhr, status) {
//...
});
Now, I'm using MicrosoftMvcAjax and MicrosoftAjax and when a XHR request finished a message in the console says: XHR finished loading.
How I can catch when a xhr request finish or what is the equivalent for ajaxComplete in xhr?
Use a counters
var _complete = 0, _on = 0;
function incr(){ _on++; }
function comp(){ _complete++; if(_complete==_on) console.log("All the completed")}
// Now use these function wherever you want to make an AJAX Call like
incr();
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)
{
comp();
document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","ajax_info.txt",true);
xmlhttp.send();
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.
I currently have three stored JS variables (wordChoiceOne, wordChoiceTwo, wordChoiceThree). Now that I have these stored, I want to run a function called saveUsername(). This function should do the following:
Take the jQuery variables above and pass them into PHP and load the file register-form.php into the div register-login-form
So I currently have the following AJAX request, but this only handles the reloading of the form. I've never combined jQuery with PHP before so how can I add the part in this to pass the three variables?
function saveUsername(wordChoiceOne, wordChoiceTwo, wordChoiceThree){
{
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)
{
document.getElementById("login-register-form").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","register-form.php",true);
xmlhttp.send();
}
What do I add to this to pass the three variables and convert them to PHP vars like with a $ sign?
function saveUsername(wordChoiceOne, wordChoiceTwo, wordChoiceThree){
{
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)
{
document.getElementById("login-register-form").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","register-form.php?one="+wordChoiceOne+"&two="+wordChoiceTwo+"&three="+wordChoiceThree,true);
xmlhttp.send();
}
Then PHP side, use $_GET['one'], $_GET['two'] and $_GET['three']
So what i'm looking for is a way to trigger 2 function events onchange with my first option, i've looked up a few examples on other sites an neither of them works. But what i want is when this.value is selected, for the function to open 2 separate options via the selection.
So if category is Dogs it does showSub(Dogs) and showSize(Dogs) at the same time and sends to 2 different php page calls, IF thats possible.
//index.php
<select name="category" onChange="showSub(this.value);showSize(this.value)" style="width:200px;">
<option value="">Select Category</option>
Send to php to get actual options.
</select>
//foo.js
function showSub(str)
{
if (str=="") {
document.getElementById("txtSub").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) {
document.getElementById("txtSub").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","getSub.php?q="+str,true);
xmlhttp.send();
}
function showSize(str)
{
if (str=="") {
document.getElementById("txtSize").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) {
document.getElementById("txtSize").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","getSize.php?q="+str,true);
xmlhttp.send();
}
//rest of index.php
<div id="txtSub"></div>
<div id="txtSize"></div>
Use var to declare all variables. Your showSub() and showSize() functions both use a variable xmlhttp that is not declared with var, which makes it global - so when you call showSize() it overwrites the xmlhttp object from showSub() (which is why you get the effect mentioned in a comment where "with the current code, the showsize only shows").
So add this line to the start of each function:
var xmlhttp;
And better yet, move the if/else out into a separate function that returns an xmlhttp object rather than repeating that code in both functions:
function getXMLHttp() {
return window.XMLHttpRequest ? new XMLHttpRequest() // newer browsers
: new ActiveXObject("Microsoft.XMLHTTP"); // old IE
}
// and then within your other functions:
var xmlhttp = getXMLHttp();
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);