Develop Reference

How to get variable from one Ajax function to work in another Ajax function

I am attempting use a variable that I create through data being sent from php in one ajax function in a another ajax function. I'm not sure what I am doing wrong. I tried creating making this a global variable by doing var nameOutput and also tried var nameOutput = 0. You will see alert code in the second ajax function. This is outputting nothing. If I remove the .val(), I receive object Object.
The code in question is in the second Ajax function: data: {
'nameOutput': nameOutput.val()
}
Does anyone have any idea what I have to do?
var nameOutput;
$('#shuffle').on('click', function() {
$.ajax({
url: 'php/name-selection.php',
type: 'POST',
success: function(data) {
nameOutput = $('#name-output').html(data);
$(nameOutput).html();
},
complete:function(){
$('#send-info').slideDown(1500);
},
error: function(xhr, textStatus, errorThrown) {
alert(textStatus + '|' + errorThrown);
}
});
});
//var datastring1 = $('#name-output').serialize();
$('.check').click(function() {
alert(nameOutput.val());
$.ajax({
url: 'php/name-selection-send.php',
type: 'POST',
data: {
'nameOutput': nameOutput.val()
}
,
success: function(data) {
if (data == 'Error!') {
alert('Unable to submit inquiry!');
alert(data);
} else {
$('#success-sent').html(data);
}
},
complete:function(){
},
error: function(xhr, textStatus, errorThrown) {
alert(textStatus + '|' + errorThrown);
}
});

if you can set inner html of nameOutput using .html('blah') , so you can extract the html again using nameOutput.html() not nameOutput.val();
however I think you have to define the element like this to be a HTML element:
var nameOutput=$('<div></div>');
also in first ajax function,set the html using this:
nameOutput.html(data);
and if there is a real element with ID name-output , and you want the result to be visible, do both of these:
nameOutput.html(data);
$('#name-output').html(data);

jQuery AJAX function call

I have a problem with jQuery calling an AJAX function, basically everytime a user changes a select box, I want it to call the getSubCategories function, but for some reason, nothing is happening. Any ideas?
If I load the page and add console.log inside the getSubCategories function it logs it, should that even be happening?
function getSubCategories() {
var id = $("#category").prop('selectedIndex');
var selectedCategory = $("#category").val();
//should change this into a response from AJAX and grab the slug from there, this is fine for now.
var slugOfCategory = convertToSlug(selectedCategory);
id++;
console.log('here');
$.ajax({
method: 'GET', // Type of response and matches what we said in the route
url: '/product/get_subcategories', // This is the url we gave in the route
data: {
'id': id
}, // a JSON object to send back
success: function(response) { // What to do if we succeed
$("#sub_category option").remove(); //Remove all the subcategory options
$.each(response, function() {
$("#sub_category").append('<option value="' + this.body + '">' + this.body + '</option>'); //add the sub categories to the options
});
$("#category_slug").attr('value', slugOfCategory);
},
error: function(jqXHR, textStatus, errorThrown) { // What to do if we fail
console.log(JSON.stringify(jqXHR));
console.log("AJAX error: " + textStatus + ' : ' + errorThrown);
}
});
}
function getCategories() {
var id = $("#type").prop('selectedIndex');
var selectedType = $("#type").val();
//should change this into a response from AJAX and grab the slug from there, this is fine for now.
var slugOfType = convertToSlug(selectedType);
console.log(slugOfType);
//add one to the ID because indexes dont start at 0 as the id on the model
id++;
$.ajax({
method: 'GET', // Type of response and matches what we said in the route
url: '/product/get_categories', // This is the url we gave in the route
data: {
'id': id
}, // a JSON object to send back
success: function(response) { // What to do if we succeed
$("#category option").remove(); //Remove all the subcategory options
$.each(response, function() {
$("#category").append('<option value="' + this.name + '">' + this.name + '</option>'); //add the sub categories to the options
});
$("#type_slug").attr('value', slugOfType);
},
error: function(jqXHR, textStatus, errorThrown) { // What to do if we fail
console.log(JSON.stringify(jqXHR));
console.log("AJAX error: " + textStatus + ' : ' + errorThrown);
}
});
}
function convertToSlug(Text) {
return Text
.toLowerCase()
.replace(/ /g, '_')
.replace(/[^\w-]+/g, '');
}
$(document).ready(function() {
var firstCatgegory = $("#category").val();
var slugOfFirstCategory = convertToSlug(firstCatgegory);
$("#category_slug").attr('value', slugOfFirstCategory);
var firstType = $("#type").val();
var slugOfFirstType = convertToSlug(firstType);
$("#type_slug").attr('value', slugOfFirstType);
$("#type").change(getCategories());
$("#category").change(getSubCategories());
});
Thanks for any help. (Sorry the code is a little messy, i've just been trying to get it to work so far)

This is due to the fact that the ajax call you are trying to make is asynchronous. When you call getSubCategories() it returns undefined which is why your code is not working.
To make this work you need to put your code within the success callback function instead.
<script>
function getSubCategories()
{
var id= $("#category").prop('selectedIndex');
$.ajax({
method: 'GET',
url: '/product/get_subcategories',
data: {'id' : id},
success: function(response){
// DO SOMETHING HERE
},
error: function(jqXHR, textStatus, errorThrown) { }
});
}
$( document ).ready(function() {
// This is also wrong. Currently you're passing
// whatever is returned from getSubCategories
// (which is undefined) as the callback function
// that the "change" event will call. This instead
// should be the reference to the function. Which
// in this case is getSubCategories
$("#category").change(getSubCategories);
});

Please put getCategories() and getSubCategories() Methods inside Change function like this.Sorry for not code formatting.
<script>
$(document).ready(function(){
$("#category").change(function(){
getSubCategories();
});
$("#type").change(function(){
getCategories();
});
});
</script>

Adding JSON object items to DIVs with same class

I've looked up a lot of examples and none really answered my question. I'm trying to iterate through a JSON file and add certain items to divs on my page.
Here's the code I've written so far. This code returns all the item values of all objects into the different divs instead of appending each item to its div. You can ignore the first for loop, it's just for adding id's to each div. I've also created an example fiddle.
$.ajax({
type: 'GET',
url: 'https://api.twitch.tv/kraken/streams',
dataType: 'json',
success: function(data) {
console.log(data);
var name = document.getElementsByClassName("player-name");
var gamename = document.getElementsByClassName("gamename");
var viewcount = document.getElementsByClassName("viewcount");
var date = document.getElementsByClassName("date");
var numItems = $('.stream').length;
var i = 1;
$('.stream').each(function(i) {
$(this).attr('id', (i + 1));
i++;
});
$('.stream').each(function(i, obj) {
$.each(data.streams,function(index,item) {
$(name).append(item.channel.name);
$(gamename).append(item.channel.game);
$(viewcount).append(item.viewers);
$(date).append(item.created_at);
});
});
},
error: function(XMLHttpRequest, textStatus, errorThrown) {
console.log("some error");
}
});

var name = $(".player-name"); // jQuery's $ cares about your fingers
var gamename = $(".gamename");
var viewcount = $(".viewcount");
var date = $(".date");
$.ajax({
type: 'GET',
url: 'https://api.twitch.tv/kraken/streams',
dataType: 'json',
success: function(data) {
console.log(data);
$.each(data.streams,function(index,item) {
// now use .eq(index) over your elements collections
name.eq(index).append(item.channel.name);
gamename.eq(index).append(item.channel.game);
viewcount.eq(index).append(item.viewers);
date.eq(index).append(item.created_at);
});
},
error: function(XMLHttpRequest, textStatus, errorThrown) {
console.log("some error");
}
});

Trying to populate Select with JSON data using JQUERY

It looks like everything has gone fine retrieving the data from the ajax call, but I having trouble to fill the select with the JSON content, it keeps firing this error in the console:
Uncaught TypeError: Cannot use 'in' operator to search for 'length' in [{"0":"1","s_id":"1","1":"RTG","s_name":"RTG"},{"0":"2","s_id":"2","1":"IR","s_name":"IR"},{"0":"3","s_id":"3","1":"NCR","s_name":"NCR"},{"0":"4","s_id":"4","1":"RIG","s_name":"RIG"},{"0":"5","s_id":"5","1":"VND","s_name":"VND"}]
The JS is this
function populateSelect(et_id){
$.ajax({
url: "http://localhost/new_dec/modules/Utils/searchAvailableStatus.php",
type: "get", //send it through get method
data:{et_id:et_id},
success: function(response) {
var $select = $('#newStatus');
$.each(response,function(key, value)
{
$select.append('<option value=' + key + '>' + value + '</option>');
});
},
error: function(xhr) {
//Do Something to handle error
}
});
}
The JSON looks like this:
[{"0":"1","s_id":"1","1":"RTG","s_name":"RTG"},{"0":"2","s_id":"2","1":"IR","s_name":"IR"},{"0":"3","s_id":"3","1":"NCR","s_name":"NCR"},{"0":"4","s_id":"4","1":"RIG","s_name":"RIG"},{"0":"5","s_id":"5","1":"VND","s_name":"VND"}]

I think you need something like this.
function populateSelect(et_id){
$.ajax({
url: "http://localhost/new_dec/modules/Utils/searchAvailableStatus.php",
type: "get", //send it through get method
data:{et_id:et_id},
success: function(response) {
var json = $.parseJSON(response);
var $select = $('#newStatus');
$.each(json ,function(index, object)
{
$select.append('<option value=' + object.s_id+ '>' + object.s_name+ '</option>');
});
},
error: function(xhr) {
//Do Something to handle error
}
});
}

Assuming your server side script doesn't set the proper Content-Type: application/json response header you will need to parse the response to Json.
Then you could use the $.each() function to loop through the data:
var json = $.parseJSON(response);

I don't understand AJAX callbacks

I have a javascript function which executes on the change of a dropdown:
<script type="text/javascript">
$(function()
{
// Executes when the status dropdown changes value
$('select[name="status_dropdown"]').change(function(event)
{
var $this = $(event.target);
var orderId = $this.closest('tr').children('td:eq(0)').text(); // index 0 refers to the "order_id column" in the table
var result = null;
var scriptUrl = "ajax_php/update_status.php?order_id=" + orderId + "&status_id=" + this.value;
$.ajax(
{
url: scriptUrl,
type: 'get',
dataType: 'html',
async: false,
success: function(data)
{
result = data;
alert(result);
}
});
});
})
</script>
I am trying to get the alert call to show the return value of the following php code (which is true):
<?php
.
.
.
return true;
?>
The alert doesn't pop up. Anyone know why ???

I tried your code with another URL and it's working well.
There are three cases:
scriptUrl is not calculated properly and doesn't point to your PHP script
your server is down
you are accessing an URL not served under the same domain as the one of your script (same-origin policy)
You can see detail of your error if you add an error handler to ajax parameters :
error : function(jqXHR, textStatus, errorThrown) {
alert(errorThrown);
}

Return only returns a value within the php script - to output it to ajax you need to actually output the result to the page, in this case something like echo "true"; or print("true");

Try this
$(document).ready(function(){
$('select[name="status_dropdown"]').change(function(event)
{
var $this = $(event.target);
var orderId = $this.closest('tr').children('td:eq(0)').text(); // index 0 refers to the "order_id column" in the table
var result = null;
var scriptUrl = "ajax_php/update_status.php?order_id=" + orderId + "&status_id=" + this.value;
$.ajax(
{
url: scriptUrl,
type: 'get',
dataType: 'html',
async: false,
success: function(data)
{
result = data;
alert(result);
}
});
});
});