How to call ajax on fly for implementing pagination

How to call ajax on fly for implementing pagination - javascript

I have the following javascript code having class named as PurchaseHistory.
var baseUrl = null;
var parameters = null;
var currentPageNumber = null;
var TotalPages = null;
var PageSize = null;
$(document).ready(function () {
baseUrl = "http://localhost/API/service.svc/GetOrderHistory";
parameters = '{"userId":1 , "page":1 ,"pageSize":4}';
currentPageNumber = 1;
var history = new PurchaseHistory();
history.ajaxCall(parameters);
});
function PurchaseHistory() {
/* On ajax error show error message
-------------------------------------------------*/
this.onAjaxError = function() {
$('#error').text('No internet connection.').css('color', 'red');
}
/* Ajax call
-------------------------------------------------*/
this.ajaxCall = function (parameters) {
$.support.core = true;
$.ajax({
type: "POST",
url: baseUrl,
data: parameters,
//dataType: 'json',
contentType: "application/json; charset=UTF-8",
error: function () { this.onAjaxError() }
}).done(function (data) {
var json = data.GetOrderHistoryResult;
var jsonObject = $.parseJSON(json);
var history = new PurchaseHistory();
history.populateOrderHistory(jsonObject);
TotalPages = jsonObject.PgCnt;
currentPageNumber = jsonObject.CrntPg;
});
}
this.populateOrderHistory = function(results) {
var rowOutput = "";
var his = new PurchaseHistory();
for (var i = 0; i < results.Results.length; i++) {
rowOutput += this.renderCartList(results.Results[i], 1);
}
}
this.renderCartList = function(res, i) {
var container = $('#prototype-listelement>li').clone();
container.find('.order-date').text(res.OdrDate);
container.find('.item-count').text(res.Qty);
container.find('.total').text(res.Amt);
container.find('.order-id').text(res.OdrId);
$('#mainul').append(container).listview('refresh');
}
this.loadNextPage = function () {
parameters = '{"userId":1 , "page":' + currentPageNumber + 1 + ',"pageSize":4}';
this.ajaxCall(parameters);
}
}
The ajaxCall is made on the ready function of the javascript.
This ajax calls returns Json object with pages information, which includes current page number, total pages and page size.
Currently I am able to display the information on the UI, when the page gets loaded.
My Issue:-
I want to call the ajax method again, on the button click event.
How this can be made possible and where can I store the information obtained from previous ajax call?

For pagination I would create a link that will load more items onto the page, and save a starting number to pass to your data layer. This example loads 20 at a time.
<a class="more" href="#" data-start="0">show more</a>
$("a.more").click(function(e){
e.preventDefault();
var start = $(this).attr('data-start');
$.get('/more-data, { start: start }, function(d){
var next = start+20;
$("a.more").attr('data-start', next);
//process results here, do something with 'd'
});
});

Related

How to implement caching || Game of thrones API

I am playing around with Game of thrones Api - https://anapioficeandfire.com/Documentation.
The documentation mentions they are implementing rate limiting. Hence implementing cache is important.
Let's say I want to print all the names of the houses from the Api on a button click
function getAllHouseNames() {
for (let i = 1; i <= 45; i++) {
getHouseNames(i)
}
}
async function getHouseNames(page) {
var req = new XMLHttpRequest();
req.onreadystatechange = await
function() {
if (this.readyState == 4 && this.status == 200) {
//console.log(req.getResponseHeader("link"));
let houseObj = JSON.parse(this.responseText);
for (let i = 0; i < houseObj.length; i++) {
let p = document.createElement("p");
let name = document.createTextNode(houseObj[i].name);
p.appendChild(name);
document.body.appendChild(p);
}
}
};
req.open("GET", "https://www.anapioficeandfire.com/api/houses?page=" + page + "&pageSize=10", true);
req.send();
};
Around 45 requests are fired (Since there are 45 pages with information about houses).
How do i implement caching technique in this scenario?

Create a global/module level variable. In the code below, I called it cache. then add the properties to it when you have retrieved them. then they are available for later use.
<!doctype html>
<head>
<title>A Song of Ice and Fire</title>
<!-- include jQuery -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
var cache = {}; // create a new object for the cache
$(document).ready(function() {
// once the page is loaded, register a click listener on the button
$("#btn-get-house-names").on("click", getAllHouseNames);
});
function getAllHouseNames() {
// if the cache object doesn't have
// a property called "houseNames", go ajax
// otherwise just display the house names in the document
if (!cache.houseNames) {
$("#div-house-names").html("Getting House Names");
getHouseNamesAjax()
} else {
$("#div-house-names").html("");
$.each(cache.houseNames, function(index, houseName) {
$("#div-house-names").append("<p>" + houseName + "</p>");
});
}
}
function getHouseNamesAjax(page) { // use jQuery to ajax
let pageId = "";
let pageSize = "pageSize=10";
if (page) {
pageId = "?page=" + page + "&" + pageSize;
} else {
pageId = "?" + pageSize;
}
$.ajax({
type: "GET",
url: "https://www.anapioficeandfire.com/api/houses" + pageId,
dataType: "json",
success: function(data, textStatus, request) {
if (!cache.houseNames) { // add the houseNames array to the cache object
cache.houseNames = [];
}
$.each(data, function(index, house) {
cache.houseNames.push(house.name); // append to the end of the array
});
if (request.getResponseHeader("link")) { // this looks to see if there is another page of house names
let headerLinks = request.getResponseHeader("link").split(",");
let hasNext = false;
$.each(headerLinks, function(index, headerLink) {
let roughLink = headerLink.split("; ")[0];
let roughRel = headerLink.split("; ")[1];
let rel = roughRel.substring(5, roughRel.length - 1);
if (rel == "next") {
let pageNum = roughLink.split("?page=")[1].split("&page")[0];
getHouseNamesAjax(pageNum);
hasNext = true;
return false; // break out of $.each()
}
});
if (!hasNext) {
// if no more pages of houseNames,
// display the house names on the page.
// We have to do this here, because ajax is async
// so the first call didn't display anything.
getAllHouseNames();
}
}
},
error: function(data, textStatus, request) {
alert(textStatus);
}
});
};
</script>
</head>
<body>
<input type="button" id="btn-get-house-names" value="Get House Names"/>
<div id="div-house-names"> <!-- house names -->
</div>
</body>
</html>

Multiple onblur elements gives error

I am try to call a function onblur of my three elements in my table
but i am getting this error in my console
"((m.event.special[e.origType] || (intermediate value)).handle || e.handler).apply is not a function".
So onblur these elements i want to call my function.Please do have a look at my code once.
Apologies for my bad handwriting here .I am new to javascript
jq.ajax({
url: '/soap/ajax/36.0/connection.js',
dataType: 'script',
success: function() {
jq(document).ready(function() {
// call tookit dependent logic here
jq('#gbMainTable').on('blur', 'tr.dr td[name="v4"] select','tr.dr td[name="v6"] select','tr.dr td[name="v7"] input', function()
{
var thisInput = this;
console.log('thisInput.value',thisInput.value);
var thisInput1 = jq(this);
var thisRow = thisInput1.parents('tr.dr:first');
console.log('thisRow',thisRow);
var agentInput1 = thisRow.find('td:eq(7)');
console.log('agentInput1',agentInput1);
var finds1 = agentInput1.find('select');
console.log('finds1',finds1);
var agentInput2 = thisRow.find('td:eq(8)');
console.log('agentInput2',agentInput2);
var finds2= agentInput2.find('input');
if(agentInput1.text()!=='' & thisInput.value=='Programmable Cntrls/Welders/AC Drives/Soft Starts'){
exampleFunction('Programmable',agentInput1.text(),agentInput2.text());
console.log('YES');
}
else if(agentInput1.text()!=='' & thisInput.value=='Electro Mechanical'){
exampleFunction('Electro-Mechanical',agentInput1.text(),agentInput2.text());
}
});
});
},
async: false
});
function exampleFunction(Warranty,Years,charge) {
var state = { // state that you need when the callback is called
output : null,
startTime : new Date().getTime()};
var callback = {
//call layoutResult if the request is successful
onSuccess: doThis,
//call queryFailed if the api request fails
onFailure: queryFailed,
source: state};
sforce.connection.query(
"SELECT InOut__c,PlantPct__c,T37Pct__c,TotalPct__c,Type__c,Warranty_Code__c,Years__c FROM WarrantySpecialLine__c where InOut__c = '" +charge+"' and Years__c = '"+Years+"' and Type__c = '" +Warranty +"'",
callback);
}
function queryFailed(error, source) {
console.log('error: '+error);
}
/**
* This method will be called when the toolkit receives a successful
* response from the server.
* #queryResult - result that server returned
* #source - state passed into the query method call.
*/
function doThis(queryResult, source) {
if (queryResult.size > 0) {
var output = "";
// get the records array
var records = queryResult.getArray('records');
// loop through the records
for (var i = 0; i < records.length; i++) {
var warrantySpecial = records[i];
console.log(warrantySpecial.PlantPct__c + " " + warrantySpecial.TotalPct__c + " " +warrantySpecial.T37Pct__c );
}
}
}

jQuery - how to receive result from an inner ajax call?

I am developing an web app in which the user will be able to identify the location from map by clicking on the map (I use jquery 3.1). The problem is that I have to make some ajax calls, one depend on other, and on the last call the result it's not returned as a whole (full array) and I received only a part of array.
The problem survives from var a4.
How I can make that a4 result to be send as a full array because I tried with deferred but with no expecting result?
var getLocDetails = function () {
// Parse a web api based on user lat & lon
var a1 = $.ajax({
method: 'GET',
url: 'http://nominatim.openstreetmap.org/reverse?lat=44.43588&lon=26.04745&accept-language=ro&format=json'
});
// Get osm_type & osm_id and parse another web service to get a XML document (Ex.: https://www.openstreetmap.org/api/0.6/way/28240583)
var a2 = a1.then(function (data) {
return $.ajax({
method: 'GET',
url: 'https://www.openstreetmap.org/api/0.6/' + data.osm_type + '/' + data.osm_id
})
});
// Get all 'ref' attribute from every 'nd' node from XML and make an array with this values
var a3 = a2.then(function (data) {
var osmChildren = data.documentElement.childNodes;
var out = [];
for (var i = 0; i < osmChildren.length; i++) {
if (osmChildren[i].nodeName == 'way') {
var wayChildren = osmChildren[i].childNodes;
for (var j = 0; j < wayChildren.length; j++) {
if (wayChildren[j].nodeName == 'nd') {
var ndRef = Number.parseInt(wayChildren[j].getAttribute('ref'));
out.push(ndRef);
}
}
}
}
return out;
});
// HERE IS THE PROBLEM
// Based on array returned from a3, I am parsing every link like 'https://www.openstreetmap.org/api/0.6/node/ + nodeRef' to extract every lat and lon values for extreme points
var a4 = a3.then(function (data) {
var defer = $.Deferred();
var out = [];
for (var i = 0; i < data.length; i++) {
var nodeRef = data[i];
var nodeUrl = 'https://www.openstreetmap.org/api/0.6/node/' + nodeRef;
$.ajax({
method: 'GET',
url: nodeUrl
}).done(function (response) {
var node = response.documentElement.firstElementChild;
var lat = Number.parseFloat(node.getAttribute('lat'));
var lng = Number.parseFloat(node.getAttribute('lon'));
out.push([lat, lng]);
defer.resolve(out);
});
}
return defer.promise();
});
// When a4 is done, based his result, I have to have an array of lat & lon coordonates, but I recived only 1-2 coordonates even I have 10.
a4.done(function (data) {
console.log(data);
// Here I have to draw a polygon
});
}

you need to handle the requests in an array, as what you are doing tends to resolve the callback for a4 before all are complete.
To do this we can use $.when function
var req = [];
// Based on array returned from a3, I am parsing every link like 'https://www.openstreetmap.org/api/0.6/node/ + nodeRef' to extract every lat and lon values for extreme points
var a4 = a3.then(function (data) {
var defer = $.Deferred();
var out = [];
for (var i = 0; i < data.length; i++) {
var nodeRef = data[i];
var nodeUrl = 'https://www.openstreetmap.org/api/0.6/node/' + nodeRef;
req.push(
$.ajax({
method: 'GET',
url: nodeUrl
}).done(function (response) {
var node = response.documentElement.firstElementChild;
var lat = Number.parseFloat(node.getAttribute('lat'));
var lng = Number.parseFloat(node.getAttribute('lon'));
out.push([lat, lng]);
})
);
}
$.when.apply($, req).done(function(){
return defer.resolve(out);
});
return defer.promise();
});

jQuery - code repetition

I am absolute begginer in jQuery. I wrote some code for my app and put it into .js file:
How should I avoid code repetition in jQuery? Where should I store my .js code (one huge .js file, couple of smaller or straight in html source)?
This is my .js file:
$(document).ready(function() {
$("label[for='id_category1'], #id_category1, label[for='id_subcategory1'],#id_subcategory1 ").hide();
$('select[name=subcategory]').empty();
$('select[name=subcategory]').prepend('<option value="Not selected" selected disabled>Select Category...</option>');
$('select[name=subcategory1]').empty();
$('select[name=subcategory1]').prepend('<option value="Not selected" selected disabled>Select Category...</option>');
// called when category field changes from initial value
$('#id_group').change(function() {
var $this = $(this);
if ($this.find('option:selected').attr('value') == 'premium') {
$("label[for='id_category1'], #id_category1").show();
$("label[for='id_subcategory1'], #id_subcategory1").show();
} else {
$("label[for='id_category1'], #id_category1").hide();
$("label[for='id_subcategory1'], #id_subcategory1").hide();
}
})
$('#id_category').change(function() {
var $this = $(this);
if ($this.find('option:selected').index() !== 0) {
category_id = $('select[name=category]').val();
request_url = '/get_subcategory/' + category_id + '/';
$.ajax({
url: request_url,
type: "GET",
success: function(data) {
$('select[name=subcategory]').empty();
$.each(data, function(key, value) {
$('select[name=subcategory]').append('<option value="' + key + '">' + value + '</option>');
});
}
})
}
})
$('#id_category1').change(function() {
var $this = $(this);
if ($this.find('option:selected').index() !== 0) {
category_id = $('select[name=category1]').val();
request_url = '/get_subcategory/' + category_id + '/';
$.ajax({
url: request_url,
type: "GET",
success: function(data) {
$('select[name=subcategory1]').empty();
$.each(data, function(key, value) {
$('select[name=subcategory1]').append('<option value="' + key + '">' + value + '</option>');
});
}
})
}
})
$("label[for='id_keywords']").html("Keywords 0/100");
$('#id_keywords').keyup(function() {
var charsno = $(this).val().length;
$("label[for='id_keywords']").html("Keywords (" + charsno + "/100)");
});
$("label[for='id_description']").html("Description 0/250");
$('#id_description').keyup(function() {
var charsno = $(this).val().length;
$("label[for='id_description']").html("Description (" + charsno + "/2500)");
});
});
Thank you for any clues to beginner.

ALWAYS separate javascript from HTML.
ALWAYS separate and load separate javascript files according to separate functionality.
Then try and break down into MVC type architecture. I've been there where a javascript file is 2000 lines long - its unmanageable for editing and debugging.
ALWAYS try and use classes.
Class architecture is pseudo in Javascript but:
var view;
var model;
var ctrl;
/** - js_include_mvc.js
* as per:
* http://stackoverflow.com/questions/15192722/javascript-extending-class
* provides the bare minimum facility to instantiate MVC objects if the base mvc classes are not subclassed
* this ensures there is always js mvc
*
*/
Ctrl.inherits(BaseCtrl);
function Ctrl(args) {
BaseCtrl.apply(this, arguments);
Ctrl.prototype.boot = function () {
}
}
View.inherits(BaseView);
function View(args) {
BaseView.apply(this, arguments);
View.prototype.boot = function () {
}
}
Model.inherits(BaseModel);
function Model(args) {
BaseModel.apply(this, arguments);
Model.prototype.boot = function () {
}
}
Then for example:
function BaseView() {
BaseView.prototype.somemethod = function () {
//some functionality here
return "I am a View";
}
}
And finally call it in the global page script:
var view=new BaseView();
view.somemethod();
outputs:
"I am a view"
I term the class BaseView as I put code that is always reused here, however the BaseView class can be further extended according to application. So BaseView is used a a main repository for all my apps and I extend it according to requirements.

Some of my code comments need a rewrite but my Ajax class goes like this:
if (SERVER_INTERFACES == undefined) {
var SERVER_INTERFACES = {};//global server array required for named multiple servers and asynch data callbacks
}
/** Ajax_js - communicates with the server to retrieve data
*
* #param String newName is the name this class can reference for things like callbacks
* #param Strin newUrl
* #param String newNamedServer is the resource url defined as a php ajax server class
* #returns {Ajax}
*/
function Ajax_m(newName, newUrl, newNamedServer) {
this.namedServer = newNamedServer;
this.interface_name = newName;
this.url = newUrl;
this.server_data; //allows a query to be given an id and the result data stored and accessible without having to manipulate into method arguments which might require data changes
this.server_data = new Array(); //allows a query to be given an id and the result data stored and accessible without having to manipulate into method arguments which might require data changes
this.request_index = 0;
this.multiqueryindex = 0;
this.multiqueryctrl = new Array();
this.dataType = "json";
this.reqType = "post";
SERVER_INTERFACES[this.interface_name] = this;
Ajax_m.prototype.request = function (requestobj, callback, optargs) {
optargs = model.array_defaults(optargs, {runtagvals: {}});
if (optargs.id == undefined) {
this.request_index++;
} else {
this.request_index = optargs.id;
}
var request_id = this.request_index;
if (typeof requestobj == "string") {
//legacy was the requestobj as a string which is set to request and defaults assumed
//attempt to parse ajaxRequestSubType as first 'word'
var clauseend = requestobj.indexOf(" ");
var ajaxRequestSubType = requestobj.substr(0, clauseend);
requestobj = {ajaxRequestSubType: ajaxRequestSubType, request: requestobj, callback: callback, request_id: request_id};
} else {
//for legacy if callback and id are defined they are added but if in requestobj they will be overridden
var args = {callback: callback, request_id: request_id};
for (var r in requestobj) {
args[r] = requestobj[r];
}
requestobj = args;
}
//ensure default settings
var requestbuild = model.array_defaults(
requestobj,
{
request: null,
callback: "",
errorCallback: null,
request_id: null,
interface_name: this.interface_name,
responsedata: null,
multirequestid: null,
ajaxRequestSubType: "",
ajaxRequestType: "database", //default to use database cfg definitions of site
ismultiparent: false,
_method: "PATCH"//for laravel5
}
);
requestbuild.request = model.runtagreplace(requestbuild.request, optargs.runtagvals);
this.server_data[request_id] = requestbuild;
//debug in chrome as firebug fucks up badly with switch control
switch (requestbuild.ajaxRequestSubType) {
//control processes so no actual ajax requests are required
case "multirequest_parent":
case "multilrequest_submit":
break;
default:
this.server_data[request_id].ajax = $.ajax({
headers: {
'X-CSRF-TOKEN': laravelCSRF//this is a constant from php JSCONSTANTS
},
url: this.url,
type: this.reqType,
data: requestbuild,
dataType: this.dataType,
success: function (server_response) {
var requestobj = SERVER_INTERFACES[server_response.interface_name]; //.server_data[request_id];
if (requestobj.server_data[request_id] != undefined) {//check existence - a reset might have been requested since query sent
requestobj.setRequestResult(server_response.request_id, server_response.data);
//check through request types to eventual detect a simple callback from client object
switch (server_response.ajaxRequestSubType) {
case "select":
case "call":
if (server_response.flag_multiRequestChild) {
var parentinterface_name = requestobj.interface_name;
var parentinterface_id = server_response.multirequest_parent;
var multiobj =
SERVER_INTERFACES[parentinterface_name].
server_data[parentinterface_id];
multiobj.request_returned++;
if (multiobj.request_returned == multiobj.request_total) {
requestobj.multiRequestFinish(requestobj.server_data[request_id].multirequest_parent);
}
} else if (server_response.callback != "") {
eval(server_response.callback + "(" + server_response.request_id + ",'" + requestobj.interface_name + "')");
}
break;
case "submit":
if (!server_response.ismultipart) {
if (server_response.callback != "") {
eval(server_response.callback + "(" + server_response.request_id + ")");
}
} else {
var multiobj = SERVER_INTERFACES[server_response.interface_name].server_data[requestobj.server_data[request_id].multisubmit_parent];
multiobj.submit_returned++;
if (multiobj.submit_returned == multiobj.submit_total) {
requestobj.multiSubmitFinish(requestobj.server_data[request_id].multisubmit_parent);
}
}
break;
case "jscsv":
var downloadobj = SERVER_INTERFACES[server_response.interface_name].server_data[request_id];
requestobj.downloadrun(downloadobj);
break;
default://need failover as cannot determine what to do
break;
}
} else {
var faildata = "error";
}
},
error: function (server_response) {
//parse unhelpful error 'data' to relocate correct ajax request object
var errordata = this.data.split("&");
var intefacename;
var requestid;
var errorobj = {isajaxerror: true};
for (var i in errordata) {
var keyval = errordata[i].split("=");
errorobj[keyval[0]] = keyval[1];
if (errordata[i].indexOf("request_id=") != -1) {
requestid = errordata[i].substr(errordata[i].indexOf("=") + 1);
}
if (errordata[i].indexOf("interface_name=") != -1) {
interfacename = errordata[i].substr(errordata[i].indexOf("=") + 1);
}
}
var parentobj = SERVER_INTERFACES[interfacename];
var requestobj = parentobj.server_data[requestid];
//new object required as out of scope
errorobj["responseText"] = server_response.responseText;
parentobj.setRequestResult(errorobj["request_id"], errorobj);
eval(errorobj["callback"] + "(" + errorobj["request_id"] + ")");
}
});
break;
}
return request_id;
}
/*
* handles ajax where data is not expected back such as an insert statement or email send
* but can expect a response message such as 'ok' or an error message
*/
Ajax_m.prototype.submit = function (type, submitdata, callback) {
this.request({ajaxRequestSubType: "submit", type: type, submitdata: submitdata, ismultipart: false, callback: callback});
}
/*
* 'multiSubmit' handles ajax where data is not expected back such as an insert statement or email send
* but can expect a response message such as 'ok' or an error message
* EXAMPLE
var multisub = [
{
type: "update",
data: {
table: "[xondbs1].stats.dbo.a_ppuser",
values: {'email': 'tim'},
matchfield: 'keyval', matchvalue: 'Q00010017'
}
},
{
type: "update",
data: {
table: "[xondbs1].stats.dbo.a_ppuser",
values: {'email': 'tim'},
matchfield: 'keyval', matchvalue: 'Q00010017'
}
}
];
ajaxdbobj.multiSubmit(multisub, "callbackfunctionname");
*/
Ajax_m.prototype.multiSubmit = function (submitobject, callback) {
var parent_request_id = this.request({ajaxRequestSubType: "multisubmit_parent", submit_total: count(submitobject), submit_returned: 0, id_list: [], submit: {}, response: {}, callback: callback});
for (var s in submitobject) {
var child_request_id = this.request({
ajaxRequestSubType: "submit",
multisubmit_parent: parent_request_id,
ismultipart: true,
type: submitobject[s].type,
submitdata: submitobject[s].data
});
this.server_data[parent_request_id].id_list[child_request_id] = s;
}
return parent_request_id;
}
/*
* sets up mutli queries to only run callback when all complete
* the requestobject is key=>query assoc to which results are assign the same key
* when all results complete the callback is run giving the request_id in the normal way
* to return the multi result object
*/
Ajax_m.prototype.multiRequest = function (requestobject, callback) {
var parent_request_id = this.request({ajaxRequestSubType: "multirequest_parent", request_total: count(requestobject), request_returned: 0, id_list: [], request: {}, data: {}, callback: callback});
for (var r in requestobject) {
/*var child_request = {
request: requestobject[r],
ajaxRequestSubType: "multirequest_child",
}*/
var child_request = requestobject[r];
child_request.multirequest_parent = parent_request_id;
child_request.flag_multiRequestChild = true;
var child_request_id = this.request(child_request);
this.server_data[parent_request_id].id_list[child_request_id] = r;
}
return parent_request_id;
}
/*
* sets up facility for javascript to download data locally
* there is no callback facility required as this is a one-way request
* with a url returned pointing to the resultant file, this is ultimately sent as a new
* window request to the file which will be handled on the native machine settings
*
* for integrity and security the server sets a unique filename ending
*
* First a meta query is sent to process what action to take - eg inform that data is emailed when ready if a length query
* This is then fed back to the user as to what is happening before the actual query can begin.
* #param type determines what download process should be used
* #param dataArgs determines how the data is retrieved
*/
Ajax_m.prototype.requestDownload = function (fileprefix, type, downloadData) {
view.dialogOpen({
title: "Download",
dialogbody: "preparing download . . .",
closeButton: false//change to false after test
});
this.request({ajaxRequestType: "requestDownload", fileprefix: fileprefix, ajaxRequestSubType: type, downloadData: downloadData});
//this.server_data[downloadid].callbacktype = action;
}
/*
* opens url to processed data downloadRequest in a new window / tab
*/
Ajax_m.prototype.downloadrun = function (reqobj) {
//getRequestResult
var meta = this.getRequestResult(reqobj.request_id);
switch (reqobj.ajaxRequestSubType) {
case "jscsv":
view.dialogOpen({
title: "Download",
dialogbody: "Your file download has finished processing.<br />Please ensure you have popups enabled for this site to be able to access the file.",
closeOK: true
});
window.open(meta.downloadurl, "download");
break;
case "dbcsv":
view.dialogOpen({
title: "Download",
dialogbody: meta.msg,
closeOK: true
});
this.request({ajaxRequestSubType: "downloadrun", filename: reqobj.filename, type: reqobj.type, downloadsource: reqobj.downloadsource}, '');
break;
}
}
/*
* kills data (returning requested will be ignored)
*/
Ajax_m.prototype.reset = function () {
for (var s in this.server_data) {
if (this.server_data[s].ajax) {
this.server_data[s].ajax.abort();
}
}
this.server_data = new Array();
this.request_index = 0;
}
/*
* relates misc data to query eg
*/
Ajax_m.prototype.setMisc = function (request_id, miscobject) {
this.server_data[request_id].misc = miscobject;
}
/*
* gets misc data to query eg
*/
Ajax_m.prototype.getMisc = function (request_id) {
return this.server_data[request_id].misc;
}
/*
* get orig query sent
*/
Ajax_m.prototype.setAjaxRequestType = function (type) {
this.reqType = type;
}
/*
* get orig query sent
*/
Ajax_m.prototype.setDataType = function (type) {
this.dataType = type;
}
/*
* get orig query sent
*/
Ajax_m.prototype.getRequest = function (request_id) {
return this.server_data[request_id].request;
}
/*
* return result data for given request id
*/
Ajax_m.prototype.getRequestResult = function (id) {
var data;//leave as undefined so code fails in the client
if (this.server_data[id]) {
data = this.server_data[id].data;
}
return data;
//return data;
}
/*
* return result data for given request id indexed by a field name
* if its not unique there will be data loss and a 'distinct' set will be returned
*/
Ajax_m.prototype.getRequestResultByCol = function (id, colname) {
var reqdata = this.getRequestResult(id);
var data = {};
for (var r in reqdata) {
data.r[colname] = data.r;
delete data.r[colname][colname];
}
return data;
//return data;
}
/**
* return a single value for given request id, if request id did actual generate
* multiple values then only the first is returned
* if this was a multirequest, the named key of the multi request is required
*/
Ajax_m.prototype.getRequestValue = function (id, multi_id) {
var retval;
if (!this.server_data[id].ismultiparent) {
retval = this.server_data[id].data[0];
} else {
retval = this.server_data[id].data[multi_id][0];
}
if (retval == undefined) {
retval = null;
}
return retval;
}
/*
* removes a query and data from memory
*/
Ajax_m.prototype.deleteRequest = function (request_id) {
delete this.server_data[request_id];
}
Ajax_m.prototype.error = function (serverData, st, ert) {
//all errors should have been handled, but just in case
var errorReport = "error";
errorReport += st;
alert("error");
}
/**********************************************************************************************************
INTENDED AS PRIVATE FUNCTIONS
**********************************************************************************************************/
/*
* sets result data for this instance for given query id - eliminates the need for eval unknown ajax data
*/
Ajax_m.prototype.setRequestResult = function (request_id, data) {
this.server_data[request_id].data = data;
}
/*
* compiles the data from the multi query parts into the array entry referenced by the query_index returned
* from client code calling the multiquery function. This also allows the required callback with a reference id to this data
*/
Ajax_m.prototype.multiRequestFinish = function (multirequestid) {
var requestobj = this.server_data[multirequestid];
var multidata = {};
var compactdata;
for (var i in requestobj.id_list) {
requestobj.data[requestobj.id_list[i]] = this.getRequestResult(i);
this.deleteRequest(i);
}
eval(requestobj.callback + "(" + multirequestid + ")");
}
/*
* finalises multisubmit and runs callback
*/
Ajax_m.prototype.multiSubmitFinish = function (multirequestid) {
var requestobj = this.server_data[multirequestid];
var multidata = {};
var compactdata;
for (var i in requestobj.id_list) {
//requestobj.data[requestobj.id_list[i]] = this.getRequestResult(i);
this.deleteRequest(i);
}
eval(requestobj.callback + "(" + multirequestid + ")");
}
}

There were quite a few repetitions in your code. Contrary to #Datadimension I did not restructure your code completely but was trying to show you ways of parameterizing a few of your expressions and functions:
$(document).ready(function() {
var labcatsubcat1=
$("label[for='id_category1'],#id_category1,label[for='id_subcategory1'],#id_subcategory1 ")
.hide();
$('select[name=subcategory],select[name=subcategory1]')
.html('<option value="Not selected" selected disabled>Select Category...</option>');
// called when category field changes from initial value:
$('#id_group').change(function() {
labcatsubcat1.toggle($(this).val()=='premium');
})
$('#id_category,#id_category1').change(function() {
var $this = $(this), postfix=this.id.match(/1*$/)[0];
if ($this.find('option:selected').index() > 0) {
category_id = $('select[name=category'+postfix+']').val();
request_url = '/get_subcategory/' + category_id + '/';
$.ajax({
url: request_url,
type: "GET",
success: function(data) {
$('select[name=subcategory'+postfix+']').empty();
$.each(data, function(key, value) {
$('select[name=subcategory'+postfix+']').append('<option value="' + key + '">' + value + '</option>');
});
}
})
}
});
["keywords,Keywords,100","description,Description,250"].forEach(e=>{
var[id,nam,len]=e.split(",");
$("label[for='id_"+id+"']").html(nam+" 0/"+len);
$('#id_'+id).keyup(function() {
var charsno = $(this).val().length;
$("label[for='id_"+id+"']").html(nam+" (" + charsno + "/"+len+")");
});
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
Unfortunately, this is not (yet) a working snippet, as you did not post your HTML ...
Just a short explanation regarding postfix: This variable will hold the string "1" or "" depending on, whether the this refers to the #id_category1 or the #id_category DOM-element.

One thing I'd do is combine the two AJAX requests. You can use multiple selectors for the change handler. Something like $('#id_category', '#id_category1').change(etc.... I'm sure you could find a way to target exactly which one is handling which request. You can use multiple selectors for the other functions as well as per the docs.
If the file is relatively short (~100 - 200 lines) I think you're fine keeping everything all in one place. Otherwise, definitely separate the functions into files and then require them as needed. You can use requireJS for this among others.

Multiple set interval script

I have a code to put two cameras on my site:
$(document).ready(function(){
var m;
var index;
var IP;
var port;
var name;
var user;
var password;
var image_old;
var image_new;
var cameraFeed;
var topImage;
var urls = [];
$.ajax({
type: "GET",
url: "json.htm?type=cameras",
dataType: "JSON",
async : false,
success: function(data) {
for(m=0; m<=1; m++){
index = data.result[m].idx;
IP = data.result[m].Address;
port = data.result[m].Port;
name = data.result[m].Name;
user = data.result[m].Username;
password = data.result[m].Password;
image_old = data.result[m].ImageURL;
image_new = image_old.replace("#USERNAME", user).replace("#PASSWORD", password);
cameraFeed = "http://" + IP + ":" + port + "/" + image_new;
alert(cameraFeed + m);
urls.push(cameraFeed);
}
setInterval(function() {
var d = Date.now();
$.each(urls, function(i, url) {
$('#topImage' + i).attr('src', url + "&timestamp=" + d);
});
}, 100);
},
error: function(data) {
alert("Error")
}
});
});
And html code:
<img id="topImage0" width="640px">
<img id="topImage1" width="640px">
I can not create a script to make setinterval work for both imgs. It works only for one of them. Any suggestions how to make it works ?
Set interval works only for one img.

To give you an idea how to structure your application code:
Get the data from the server
Create the URLs from data
Update each image every X milliseconds with those URLs
In code:
$.ajax({...}).done(function(data) { // get data from server
// create URLs
var urls = [];
for (var m = 0; m < 2; m++) { // why not iterate over data.results?
var cameraFeed;
// build cameraFeed ...
urls.push(cameraFeed);
}
// Update images
setInterval(function() {
var d = Date.now();
$.each(urls, function(i, url) {
$('#topImage' + i).attr('src', url + "&timestamp=" + d);
});
}, 100);
});
Of course this can still be approved, but that should point you into the right direction. Note in particular that it is unnecessary to have a setInterval for each image. Just let a single interval update all images.
Especially the for loop can be approved upon. I don't know how many results data.results has and if you only want to get the first two, but this is an excellent use case for Array#map:
var urls = data.results.map(function(result) {
// ...
return cameraFeed;
});

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