Develop Reference

How to set the data in AJAX success function?

I have an ajax call that is returning me the data to be populated in a drop down list. Now, I need to be able to select a value which is returned and set the value of the drop down in the same function if possible. But by using $("#idOfDropDown").val(data), it is not getting set i.e While I am submitting the data, in the database all the options that were returned and populated are getting submitted and not the selected option. So, How do I set the selected value only?
Here's my AJAX function:
$.ajax({
type: "POST",
dataType: 'json',
url: "/Controller/Action",
data: {
param: param,
},
success: function(data) {
if (data.Response == "Unsuccessful") {
console.log("Unsuccessful");
} else if (data.Response == "Successful" || data.Response == "ConditionallySuccessful") {
for (var i = 0; i < data.ExteriorColor.Data.length; i++) {
$("#Exterior_Color").append($("<option></option>").val(data.ExteriorColor.Data[i]).html(data.ExteriorColor.Data[i]));
console.log(data.ExteriorColor.Data[i]);
}
var html = '<ul>'
for (var i = 0; i < data.Options.length; i++) {
html += '<li>' + data.Options[i] + '</li>';
}
html += '</ul>'
$("#twoColumnOptions").append(html);
$("#twoColumnOptions").data(html);
$("#Options").val(data.Options);
$("#Exterior_Color").val(data.ExteriorColor.Data).change(); //Value to be changed
if (data.ExteriorColor.isInstalled == true)
$("#Exterior_Color").attr("disabled", true);
}
},
error: function(result) {
console.log("Error while fetching data");
}
});

Try to trigger the change you made using .trigger('change') like:
$("#Options").val(data.Options).trigger('change');
//Or
$("#Options").val(data.Options).change();

I implemented something similar in my solution and my code is like this, you need to set the value like this:
success: function (response) {
var array = response;
if (array != '') {
for (i in array) {
$("#district").append("<option value='"+
array[i].Id + "'>" + array[i].DistrictName + "</option>");
}
}
},

Communication beetween Javascript and PHP scripts in web app

THE CONTEXT
I'm developing a web app that loads contents dynamycally, retrieving data from a
catalogue of items stored as a MongoDB database in which records of the items and their authors are in two distinct collections of the same database.
Authors ID are stored in the item field creator and refer to the author field #id. Each item can have none,one or many authors.
Item sample
{
"_id" : ObjectId("59f5de430fa594333bb338a6"),
"#id" : "http://minerva.atcult.it/rdf/000000016009",
"creator" : "http://minerva.atcult.it/rdf/47734211-2637-3895-a690-4f33412931ec",
"identifier" : "000000016009",
"issued" : "fine sec. XIV - inizi sec. XV",
"title" : "Quadrans vetus",
"label" : "Quadrans vetus"
}
Author sample
{
"_id" : ObjectId("59f5d8e80fa594333bb1d72c"),
"#id" : "http://minerva.atcult.it/rdf/0007e43e-107f-3d18-b4bc-89f8d430fe59",
"#type" : "foaf:Person",
"name" : "Risse, Wilhelm"
}
WHAT WORKS
I query the database submitting a string in a form, using this PHP script
ITEM PHP SCRIPT
<?php
require 'vendor/autoload.php';
$title=$_GET['item'];
$client = new MongoDB\Client("mongodb://localhost:27017");
$db=$client->galileo;
$collection=$db->items;
$regex=new MongoDB\BSON\Regex ('^'.$title,'im');
$documentlist=$collection->find(['title'=>$regex],['projection'=>['_id'=>0,'title'=>1,'creator'=>1,'issued'=>1]]);
$items=$documentlist->toArray();
echo (json_encode($items));
?>
called by a Javascript script (new_search.js) using ajax, that has also the responsibility to attach to html document a <li class=item> for every item that matches the query, inserting the JSON fields and putting them in the provided tags ( <li class=item-name>,<li class=auth-name, and the last <li> in div class=item-info for date).
WHAT DOES NOT WORK
My intent is reproduce the pattern to retrieve author names from another collection in the same database, querying it using author field #id from the html tag <li class=auth-name, using a similar php script and a similar ajax call.
I tried to make a nested ajax call (in the one I used to retrieve the items infos) to invoke author_query.php that performs the MongoDB query on the collection of authors.
So, the question is: Is it possible use the $_GET superglobal to get the html tag that contains the author id #id in order to search it in the database?
Otherwise, how can I adjust the code to pass a javascript variable to php (not by user input) that lets me keep the content already loaded on the page?
UPDATES
To make clearer the question, I follow the tips in the comments and I updated my scripts using JSON directly to provide the needed data.
I also perfom a debug on the js code and it's clear that PHP don't provide any response,in fact ajax calls for authors name fails systematically.
I suppose that occurs because PHP don't receive the data dueto the fact I'm not using the correct syntax probably (in js code or in the php with $_GET or in both) to pass the variable author (I also tried data:'author='+author treating the JSON object author has a string). Anyway I don't understand what is the correct form to write the variable to pass using the data field of ajax().
MY SCRIPTS
JS SCRIPT new_search.js
$(document).ready(function () {
$("#submit").on("tap", function () {
var item = document.getElementById("search").value;
var author;
$.ajax({
url: "item_query.php",
type: "GET",
data: 'item=' + item,
dataType: "json",
async:false,
success: function (items) {
for (var i = 0; i < items.length; i++) {
$("#items-list").append(
'<li class="item">' +
'<div class="item-photo-container">' +
'<img src=images/item_126.jpg>' +
"</div><!--end item-photo-container-->" +
'<div class="item-info">' +
'<ul>' +
'<li><a><h3 class="item-name">' + items[i].title + '</h3></a></li>' +
'<li class="auth-name">' + items[i].creator+ '</li>' +
'<li>' + items[i].issued + '</li>' +
'</ul>' +
'</div><!--end item-info-->' +
'</li><!--end item-->'
);
}
}
});
$('.item').each(function () {
author = $(this).find('.auth-name').text();
if (author == 'undefined')
$(this).find('.auth-name').text('Unknown');
else if(author.indexOf(',')!=-1) {
author='[{"author":"'+author+'"}]';
author=author.replace(/,/g,'"},{"author":"');
author = JSON.parse(author);
console.log(author);
$.ajax({
url: "author_query.php",
type: "GET",
data: author,
dataType: "json",
processData: false,
success: function (auth_json) {
$(this).find('.auth-name').text('');
var author_text=' ';
for(var i=0;i<auth_json.length;i++)
author_text+=auth_json.name+' ';
$(this).find('.auth-name').text(author_text);
},
error: function () {
console.log('Error 1');
}
});
}
else{
author='{"author":"'+author+"}";
author=JSON.parse(author);
$.ajax({
url: "author_query.php",
type: "GET",
data: author,
dataType: "json",
processData: false,
success: function (auth_json) {
$(this).find('.auth-name').text(auth_json.name);
},
error: function () {
console.log('Error 2');
}
});
}
});
});
});
AUTHOR PHP SCRIPT author_query.php
<?php
require 'vendor/autoload.php';
$auth=$_GET['author'];
$client = new MongoDB\Client("mongodb://localhost:27017");
$db=$client->galileo;
$collection=$db->persons;
if(is_array($auth)){
foreach ($auth as $a){
$document=$collection->findOne(['#id'=>$a],['projection'=>['_id'=>0,'name'=>1]]);
$auth_json[]=( MongoDB\BSON\toJSON(MongoDB\BSON\fromPHP($document)));
}
}
else{
$document=$collection->findOne(['#id'=>$auth],['projection'=>['_id'=>0,'name'=>1]]);
$auth_json=( MongoDB\BSON\toJSON(MongoDB\BSON\fromPHP($document)));
}
echo (json_encode($auth_json));
?>

"I'm sure that authors array... is not empty and actually contains the authors IDs". You mean the jQuery object $('.item')? I think that it is empty, because it is created too soon.
The first $.ajax call sends an ajax request and sets a handler to add more stuff to the HTML, including elements that will match the CSS selector .item. But the handler doesn't run yet because it's asynchronous. Immediately after this, the object $('.item') is created, but it's empty because the new .item elements haven't been created yet. So no more ajax requests are sent. Some time later, the call to item_query.php returns, and the new HTML stuff is added, including the .item elements. But by now it's too late.
You say the array was not empty. I suspect you checked this by running the CSS selector after doing the search, after the return of the ajax call.
A lot of newbies have problems like this with asynchronous javascript. If you want to use the result of an asynchronous function in another function, you have to call the second function inside the callback function of the first one. (Actually there are more sophisticated ways of combining asynchronous functions together, but this is good enough for now.)
On a side note, you've done this in a slightly strange way where you save data in HTML, and then read the HTML to do some more stuff. I wouldn't use HTML as a storage place - just use variables like you would for most other things.
Try this:
$.ajax({
url: "item_query.php",
...
success: function (items) {
for (var i = 0; i < items.length; i++) {
var author = items[i].creator;
var authors;
// insert code here to generate authors from author.split(',') .
// authors should look something like this: [{author: 'http://minerva.atcult.it/rdf/47734211-2637-3895-a690-4f33412931ec'}] .
$.ajax({
url: "author_query.php",
type: "GET",
data: JSON.stringify(authors),
...
success: function (auth_json) {
...
},
error: function () {
console.log('Error 1');
}
});
$("#items-list").append(
'<li class="item">' +
'<div class="item-photo-container">' +
'<img src=images/item_126.jpg>' +
"</div><!--end item-photo-container-->" +
'<div class="item-info">' +
'<ul>' +
'<li><a><h3 class="item-name">' + items[i].title + '</h3></a></li>' +
'<li class="auth-name">' + items[i].creator+ '</li>' +
'<li>' + items[i].issued + '</li>' +
'</ul>' +
'</div><!--end item-info-->' +
'</li><!--end item-->'
);
}
}
});

I make the first call to retrieve the item infos asynchronous and the nested that search for the authors name synchronous. In this way I solved the problem.
For sure it is not the best solution, and it needs a quite long,but acceptable, time (<1 second) to load the content.
JS SCRIPT
$(document).ready(function () {
$("#submit").on("tap", function () {
var item = document.getElementById("search").value;
$.ajax({
url: "item_query.php",
type: "GET",
data: 'item=' + item,
dataType: "json",
success: function (items) {
for (var i = 0; i < items.length; i++) {
var authors_names=' ';
var authors= JSON.stringify(items[i]);
if(authors.indexOf('creator')!=-1){
if(authors.charAt(authors.indexOf('"creator":')+'"creator":'.length)!='[')
authors=authors.substring(authors.indexOf('"creator":"'),authors.indexOf('"',authors.indexOf('"creator":"')+'"creator":"'.length)+1);
else
authors=authors.substring(authors.indexOf('"creator"'),authors.indexOf(']',authors.indexOf('"creator"'))+1);
authors='{'+authors+'}';
//console.log(authors);
$.ajax({
url: "author_query_v3.php",
type: "GET",
data: 'authors='+authors,
dataType:"json",
async:false,
success: function (auth_json) {
authors=[];
authors=auth_json;
var author;
for(var j=0;j<authors.length;j++){
author=JSON.parse(authors[j]);
authors_names+=author.name+" | ";
}
console.log(authors_names);
},
error: function(jqXHR, textStatus, errorThrown) {
console.log(jqXHR+' '+textStatus+ ' '+errorThrown);
}
});
}
else{
authors_names='Unknown';
}
$("#items-list").append(
'<li class="item">' +
'<div class="item-photo-container">' +
'<img src=images/item_126.jpg>' +
"</div><!--end item-photo-container-->" +
'<div class="item-info">' +
'<ul>' +
'<li><a><h3 class="item-name">' + items[i].title + '</h3></a></li>' +
'<li class="auth-name">' + authors_names+ '</li>' +
'<li>' + items[i].issued + '</li>' +
'</ul>' +
'</div><!--end item-info-->' +
'</li><!--end item-->'
);
}
}
});
});
});
PHP SCRIPT
<?php
require 'vendor/autoload.php';
$auth=$_GET['authors'];
$client = new MongoDB\Client("mongodb://localhost:27017");
$db=$client->galileo;
$collection=$db->persons;
$auth=json_decode($auth);
$auth=$auth->creator;
if(is_array($auth)) {
foreach ($auth as $a) {
$document = $collection->findOne(['#id' => $a], ['projection' => ['_id' => 0, 'name' => 1]]);
$auth_json[] = (MongoDB\BSON\toJSON(MongoDB\BSON\fromPHP($document)));
}
}
else{
$document=$collection->findOne(['#id'=>$auth],['projection'=>['_id'=>0,'name'=>1]]);
$auth_json[]=( MongoDB\BSON\toJSON(MongoDB\BSON\fromPHP($document)));
}
echo(json_encode($auth_json));
?>

Ajax call jsonp from PHP

Hi guys so i made a code that parses a CSV file into a JSON ARRAY with PHP. So when you go to this URL you get the PHP output:
http://www.jonar.com/portal/mynewpage.php
Now i used this code to append my JSON ARRAY to HTML but now things have changed since i am using PHP i am not sure how to use it and what to do differently.
Also my ajax call is always empty which is weird..
$.ajax({
type: 'GET',
url: 'http://www.jonar.com/portal/mynewpage.php',
dataType: 'jsonp',
success: function(response) {
alert(response);
}
});
I used this to append my JSON ARRAY but now if i can get the response do i use the same code or will it have to be altered?
$.each(results.data.slice(1), // skip first row of CSV headings
function(find, data) {
var title = data.title;
var link = data.link;
var date = data.date;
var type = data.type;
var where = data.where;
var priority = data.priority;
if (priority == '1') {
$('ul.nflist').prepend($('<li>', {
html: '' + title + ' ' + ' ' + '<span class="category">' + type + '</span>'
}));
} else if (where == 'pp', 'both') {
$('ul.nflist').append($('<li>', {
html: '' + title + ' ' + ' ' + '<span class="category">' + type + '</span>'
}));
}
});
the reason i used PHP is to avoid cross domain issue
Thanks for the help guys!

JQuery Adding elements to a list from parsed JSON

I am trying to parse some JSON and take the elements "startTime" and "endTime" and add them to a list. I am able to receive the JSON successfully, however I am having trouble properly parsing and then looping through to add each instance to the list. Inside of the UL, i would like to create lists for each, like i demo below:
$.ajax({
url: 'localhost:8080/sample?',
dataType: 'json',
success: function (data){
var json = $.parseJSON(data);
var $calAppts = $('#appts');
$('<li data-role="list-divider">' + this.startTime
+ ' - ' + this.endTime + '<span class="ui-li-count"></span></li>').appendTo($appts);
The HTML where I am trying to insert the LI inside of the UL:
<div data-role="main" class="ui-content" id="headerDate">
<ul data-role="listview" data-inset="true" id="appts">
</ul>
</div>
So basically for each appointment i get back in the JSON, I want to add a new LI with the startTime and endTime.
I am using JQM 1.3.2, and JQUERY 1.8.0.
Thank you

Change this:
$.ajax({
url: 'localhost:8080/sample?',
dataType: 'json',
success: function (data){
var json = $.parseJSON(data);
var $calAppts = $('#appts');
$('<li data-role="list-divider">' + this.startTime
+ ' - ' + this.endTime + '<span class="ui-li-count"></span></li>').appendTo($appts);
Into this:
$.ajax({
url: 'localhost:8080/sample?',
dataType: 'json',
success: function (data){
var json = $.parseJSON(data);
$.each( json, function( key, value ) {
var agrega = "<li data-role='list-divider'>";
if(key=='startTime')
{
agrega = agrega + value
}
if(key=='endTime')
{
agrega = agrega + ' - ' + value;
}
agrega = agrega + '<span class="ui-li-count"></span></li>';
$('#appts').append(agrega);
});

From your code sample, it seems your problem is that you're trying to look for the startTime property in the wrong place (on this). In your sample, the startTime property should be present on your parsed JSON, so accessing the key there should do the trick:
$('<li data-role="list-divider">' + json.startTime
+ ' - ' + json.endTime + '<span class="ui-li-count"></span></li>').appendTo($appts);
If the returned JSON is a series of times, then you'll also want to loop through the JSON object as well:
$.each(json, function(key, value) {
if (key === 'startTime') {
// append to the list
}
});
Additional note:
If JSON is what is being returned from the AJAX call, then you shouldn't need to use $.parseJSON on it. JSON objects are JavaScript objects, so you can simply use the returned value and access they keys on it (meaning you can use data.startTime directly instead of parsing it first).

Please find the response below
var ulObject = $("#appts");
var ajaxObject = $.ajax({
type:"POST",
dataType:"json",
url:"" //Provide the URL in the field to be processed.
});
ajaxObject.done(function(msg){
var jsonResponse = $.parseJSON(msg);
var listObjectStart = '<li data-role="list-divider">'
var listObjectEnd = '</li>';
$.each(jsonResponse,function(key,value){
if(key === "startTime")
{
listObjectStart += value;
}
else if(key === "endTime")
{
listObjectStart += '-'+value+'<span class="ui-li-count"></span>';
}
});
listObjectStart += listObjectEnd;
ulObject.append(listObjectStart);
});

Try the following if server send the data back to client in json format.
$.ajax({
url: 'localhost:8080/sample?',
dataType : 'json',
success: function(data){
$("#appts").append('<li data-role="list-divider">' + data.startTime
+ ' - ' + data.endTime + '<span class="ui-li-count"></span></li>');
},
error: function(){
alert('There was an error in communication.');
}
});

Looking for an standard way to post json data on full postback

I wonder if I have any other method but a hidden field to post a JSON object to the server on full postback.
Imagine you have a form (with textboxes, checkboxes, etc) and you need to post a json string when the user post the form. This means, I would post all the form values + the json string but I can't come up with any solution but a hidden field.
Just wondering if there is any other option.
Thanks!

Hidden field is your only option. Unless you want to display the JSON to the user, in that case you can put it into a textarea or text input.

I used this recently in my web app:
$('#submit').live('click',function(){
var postData = {};
$('#items tr').not(':first').each(function(index, value) {
var keyPrefix = 'data[' + index + ']';
postData[keyPrefix + '[index]'] = index;
postData[keyPrefix + '[supp_short_code]'] = $(this).closest('tr').find('.supp_short_code').text();
postData[keyPrefix + '[project_ref]'] = $(this).closest('tr').find('.project_ref').text();
postData[keyPrefix + '[om_part_no]'] = $(this).closest('tr').find('.om_part_no').text();
postData[keyPrefix + '[description]'] = $(this).closest('tr').find('.description').text();
postData[keyPrefix + '[quantity_input]'] = $(this).closest('tr').find('.quantity_input').val();
postData[keyPrefix + '[cost_of_items]'] = $(this).closest('tr').find('.cost_of_items').text();
postData[keyPrefix + '[cost_total_td]'] = $(this).closest('tr').find('.cost_total_td').text();
});
$.ajax
({
type: "POST",
url: "order.php",
dataType: "json",
data: postData,
cache: false,
success: function(order_id)
{
alert("Order Saved");
$('#assigned_id').html(order_id);
}
});
});
Give this a try in your application or post you html and i can form the json...