Develop Reference

Check if variable exist or not

I'm using API Jira
I'm doing some functions but before to use function, I need to verified if a value exist or not
If he exists so I can launch functions else do nothing.
I'm doing this :
// Call the file functions.js
var functions = require('./functions.js')
/*
Function getAllIssueForSCII displays all the issues in the form of a JSON and that browses all the keys that are in the SCII project
Function pushInitialization initializes the computer score card to 80 on Jira
*/
functions.getAllIssueForSCII().then(function(json){
for (let i=0; i<json.issues.length;i++){
if(json.issues[i].fields.customfield_14038 = null){ // i'm doing this
console.log(json.issues[i].key);
functions.pushInitialization(json.issues[i].key);
}
}
});
/*
A delay is added so that Jira can correctly recover the value 80.
Thanks to this value, we can do all the calculation (Function calculate)
Function pushComputerScoreCard push the final value into the computer score card.
Function generateJSON generates a JSON.
Function replaceCharacter solve the problem of array inside the JSON
*/
setTimeout(function() {
functions.getAllIssueForSCII().then(function(json){
for (let i=0; i<json.issues.length;i++){
functions.calculate(json.issues[i]);
functions.pushComputerScoreCard(json.issues[i].key);
functions.generateJSON(json.issues[i].key);
functions.replaceCharacter();
}
});
}, 1000)
My problem: After the settimeout, he recover value already exist and do the calcul...
I need to verified my condition in all of the script .
Thanks for your help

You are assigning null value in an if condition:
if(json.issues[i].fields.customfield_14038 = null){ // i'm doing this
You need to compare values:
if(json.issues[i].fields.customfield_14038 === null){ // You need to do this:

ajax reading/getting variable sometimes cannot get the exact variable with codeigniter

I am having a problem in my ajax or i don't know if it is a problem with ajax. I have an ajax code to get a value from label and concat it in my fresh data from database. Everytime i refresh the page, it outputs different. Sometimes it works fine, and sometimes it doesn't.
I am having my trouble in this part :
else {
value = value + "-"+init;
$('#checkID').text(value);
$("#checkID").css('visibility','visible');
}
sometimes it outputs 1-0 and sometimes the output became -0.
I am thinking of var value = $('#clinicID').html(); cannot concat with my -0 where the 1 of the output 1-0 is came from value variable
Here is my ajax full code :
function getcheckupID() {
var init = 0;
var value = $('#clinicID').html();
$.ajax ({
url: siteurl+"myclinic/getcheckID",
type: "GET",
dataType: "JSON",
success: function(data) {
if(data.length>0) {
$('#checkID').text(data[0]['check_up_id']);
$("#checkID").css('visibility','visible');
}
else {
value = value + "-"+init;
$('#checkID').text(value);
$("#checkID").css('visibility','visible');
}
}
})
}
my document ready code:
$(document).ready(function() {
get_clinicID();
show_patients();
checkupme();
});
where checkupme() function got a nested getcheckupID() runtime

I suggested another way to get data in #clinicID that you can use
When you refresh the page, insert your #clinicID like:
<span id="clinicID" data-value="1-0"><span> or whatever data you wanna input.
Then in getcheckupID function you'll call:
function getcheckupID() {
var init = 0;
var value = $('#clinicID').attr("data-value");
// Your code ajax
}
If it still have problem, please check your echo when page generated. Maybe there're not any value to print.
Hope this help.

Angularjs:Empty object, when have only one click?

This function i call on ng-click.
HTML
<div class="col-md-offset-10">
<div class="form-group">
<a class="btn btn-default" ng-click="schedule ()">Add</a>
</div>
</div>
JS
$scope.scheduleid={};
var inc=0;
$scope.schedule = function ()
{
inc += 1;
console.log($scope.from);
console.log ($scope.dateObj);
if (inc == 1)
{
var schedule = {}
schedule._type = "Schedule";
console.log($scope.dateObj);
var insertSchedule = BasicJSONCreator.basicEdit ();
insertSchedule.Calls[0].Arguments = [];
insertSchedule.Calls[0].Arguments[0] = schedule;
httpRequester.async (insertSchedule).then (function (data) {
console.log(data.data.ReturnValues[0].scheduleID);
$scope.scheduleid=data.data.ReturnValues[0] //This get response from my database
console.log($scope.scheduleid ); // here object is get my data from database
});
}
$scope.getData();
}
This funciton i want get result from $scope.scheduleid, but here is problem.
When i have one click $scope.scheduleid (empty), but two and more click $scope.scheduleid (no empty and get data).Why my first click is Empty.
$scope.getData=function()
{
console.log($scope.scheduleid)
// Here my object is empty when have one click,but two and more click object no empty and get data
}

You are making an HTTP request, I think the problem is there. When you first call your function through the click, your call is being processed, and your function keeps going on.
That's why when you click once, at the end of your function, your object is empty. Once your object is loaded -let's say, at your second click-, you will finally receive it. What you should do is wait for your HTTP call to end before processing. You can do this the dirty way ($timeout) or looking at solutions like this one which should provide useful informations.

Cant get the current id of a data from local Storage using jquery

I am working on an app to store data offline. My problem is when I try to retrieve the data from local storage for update/edit, it keeps calling only the id of the first item, and not calling the id of the data in view.
Please what am I doing wrong?
Here is my code for loading employees:
// load cases from localStorage
var employees;
if (localStorage.getItem('employees')) {
employees = JSON.parse(localStorage.getItem('employees'));
} else {
// If no cases, create and save them
employees = [];
// offling storing of our cases
localStorage.setItem('employees', JSON.stringify(employees));
}
// show case listing in list view page
var showEmployees = function () {
//erase existing content
$('#employee_list').html('');
//insert each employee
for (var i = 0; i<employees.length; i++) {
addEmployees(employees[i]);
}
};
Here is my code to add an employee to list view:
//add an eliment to list view
var addEmployees = function (empData) {
//HTML content of one list element
var listElementHTML = '<li><a class="employee_list" ui-btn ui-btn-e ui-btn-icon-right ui-icon-carat-r" data-transition="fade" data-split-icon="delete" href="#item'+empData.id+'">' + empData.employeename + '<br> ' + empData.dateofbirth + '</br></a></li>';
//appending the HTML code to list view
$('#employee_list').append(listElementHTML);
};
Here is my code for Edit function:
//User input to edit form
$('#edit_employee_page').on('click' , function () {
var editEmployee = JSON.stringify({
id: employees.length+1,
employeeno: $('#employeeno').val(),
employeename:$('#employeename').val(),
stateoforigine:$('#stateoforigine').val(),
employeephone: $('#employeephone').val(),
dateofbirth:$('#dateofbirth').val()
});
//Alter the slected data
localStorage.setItem("employees", JSON.stringify(employees));
return true;
});
for (var i in employees) {
var id = JSON.parse(localStorage.getItem(employees[i]));
}
Here is my code for the Edit button:
//register Edit button
$('.edit_button').live('click', function (e) {
alert('I was Cliked!');
e.stopPropagation();
$.each(employees, function(a, b) {
//if(b.id == employees[i]){
$('#id').val(b.id);
$('#employeeno').val(b.employeeno);
$('#employeename').val(b.employeename);
$("#stateoforigine").val(i.stateoforigine);
$('#employeephone').val(b.employeephone);
$('#dateofbirth').val(b.dateofbirth);
$("#id").attr("readonly","readonly");
$('#employeeno').focus();
$.mobile.changePage('#edit_employee_page');
return false;
//}
});
});
Here is my local Storage:
[
{"id":1,
"employeeno":"DEF/234/20014",
"employeename":"Bill Gates",
"stateoforigine":"Osun",
"employeephone":"080765432",
"dateofbirth":"12/11/1965"},
{"id":2,
"employeeno":"DEF/234/20014",
"employeename":"Bill Gates",
"stateoforigine":"Osun",
"employeephone":"080765432",
"dateofbirth":"12/11/1966"},
{"id":3,
"employeeno":"DEF/234/20014",
"employeename":"Bill Gates",
"stateoforigine":"Osun",
"employeephone":"080765432",
"dateofbirth":"12/11/1966"},
{"id":4,
"employeeno":"DAST/003/2003",
"employeename":"Gold Base",
"stateoforigine":"",
"employeephone":"",
"dateofbirth":"12/03/1986"}
]
Thanks for helping me out

The way you are storing your employees into localStorage is correct, but the way you are getting them out is incorrect. You stored your employees by stating:
localStorage.setItem("employees", JSON.stringify(employees));
So, in order to retrieve them, you must use:
var employees = JSON.parse(localStorage.getItem("employees"));
You see, you stored the data as a string with a key of "employees"; therefore, you can only retrieve it by that key. Since all data stored in localStorage is saved as a string, you must use JSON.parse() to convert the data back into an object - an array in this case. Then you can iterate over your employees.
Update:
You should be running this code as soon as the page is rendered (see below). I'm not sure how you're doing that - if you're using an IIFE or jQuery's document.ready() function. I don't think it's necessary to store an empty array into localStorage if none were loaded initially, so, I took your else clause out.
var employees = [];
if (localStorage.getItem('employees') !== null) {
employees = JSON.parse(localStorage.getItem('employees'));
}
Debug this line-by-line when it runs and make positive your employees variable contains data. If it doesn't contain data, well then, there's nothing to edit.
If, however, there is data, then execute your showEmployees() function. Oddly, I'm not seeing in your code where you actually call this. Is it bound to a button or action in your UI? Also, what is that for loop doing after your $('#edit_employee_page') click event function? It's trying to read data from localStorage improperly and it does nothing.
I think if you simply stepped through your code one line at a time using breakpoints and desk-checking your inputs/outputs you'd find out where you're going wrong.

It also appears that there's a disconnect in your code. May be you left out some lines; you define a string editEmployee but out of the blues you store JSON.stringify(employees) whereas employees is not defined in your code:
$('#edit_employee_page').on('click' , function(){
var editEmployee = JSON.stringify({
id: employees.length+1,
//........
});
//Alter the slected data
localStorage.setItem("employees", JSON.stringify(employees));
return true;
});

I had a similar task to do . I did it this way.
I passed the dynamic Id to be passed as an id attribute
id="'+empData.id+'"
and then inside the
$('.edit_button').live('click', function (e) {
alert('I was Cliked!');
var empId=$(this).attr('id');
rest of the code is same.

Returning a value from a jQuery Ajax method

I'm trying to use Javascript in an OO style, and one method needs to make a remote call to get some data so a webpage can work with it. I've created a Javascript class to encapsulate the data retrieval so I can re-use the logic elsewhere, like so:
AddressRetriever = function() {
AddressRetriever.prototype.find = function(zip) {
var addressList = [];
$.ajax({
/* setup stuff */
success: function(response) {
var data = $.parseJSON(response.value);
for (var i = 0; i < data.length; i++) {
var city = data[i].City; // "City" column of DataTable
var state = data[i].State; // "State" column of DataTable
var address = new PostalAddress(postalCode, city, state); // This is a custom JavaScript class with simple getters, a DTO basically.
addressList.push(address);
}
}
});
return addressList;
}
}
The webpage itself calls this like follows:
$('#txtZip').blur(function() {
var retriever = new AddressRetriever();
var addresses = retriever.find($(this).val());
if (addresses.length > 0) {
$('#txtCity').val(addresses[0].getCity());
$('#txtState').val(addresses[0].getState());
}
});
The problem is that sometimes addresses is inexplicably empty (i.e. length = 0). In Firebug the XHR tab shows a response coming back with the expected data, and if I set an alert inside of the success method the length is correct, but outside of that method when I try to return the value, it's sometimes (but not always) empty and my textbox doesn't get populated. Sometimes it shows up as empty but the textbox gets populated properly anyways.
I know I could do this by getting rid of the separate class and stuffing the whole ajax call into the event handler, but I'm looking for a way to do this correctly so the function can be reused if necessary. Any thoughts?

In a nutshell, you can't do it the way you're trying to do it with asynchronous ajax calls.
Ajax methods usually run asynchronous. Therefore, when the ajax function call itself returns (where you have return addressList in your code), the actual ajax networking has not yet completed and the results are not yet known.
Instead, you need to rework how the flow of your code works and deal with the results of the ajax call ONLY in the success handler or in functions you call from the success handler. Only when the success handler is called has the ajax networking completed and provided a result.
In a nutshell, you can't do normal procedural programming when using asynchronous ajax calls. You have to change the way your code is structured and flows. It does complicate things, but the user experience benefits to using asynchronous ajax calls are huge (the browser doesn't lock up during a networking operation).
Here's how you could restructure your code while still keeping the AddressRetriever.find() method fairly generic using a callback function:
AddressRetriever = function() {
AddressRetriever.prototype.find = function(zip, callback) {
$.ajax({
/* setup stuff */
success: function(response) {
var addressList = [];
var data = $.parseJSON(response.value);
for (var i = 0; i < data.length; i++) {
var city = data[i].City; // "City" column of DataTable
var state = data[i].State; // "State" column of DataTable
var address = new PostalAddress(postalCode, city, state); // This is a custom JavaScript class with simple getters, a DTO basically.
addressList.push(address);
}
callback(addressList);
}
});
}
}
$('#txtZip').blur(function() {
var retriever = new AddressRetriever();
retriever.find($(this).val(), function(addresses) {
if (addresses.length > 0) {
$('#txtCity').val(addresses[0].getCity());
$('#txtState').val(addresses[0].getState());
}
});
});

AddressRetriever = function() {
AddressRetriever.prototype.find = function(zip) {
var addressList = [];
$.ajax({
/* setup stuff */
success: function(response) {
var data = $.parseJSON(response.value);
for (var i = 0; i < data.length; i++) {
var city = data[i].City; // "City" column of DataTable
var state = data[i].State; // "State" column of DataTable
var address = new PostalAddress(postalCode, city, state); // This is a custom JavaScript class with simple getters, a DTO basically.
addressList.push(address);
processAddresss(addressList);
}
}
});
}
}
function processAddresss(addressList){
if (addresses.length > 0) {
$('#txtCity').val(addresses[0].getCity());
$('#txtState').val(addresses[0].getState());
}
}
or if you want don't want to make another function call, make the ajax call synchronous. Right now, it is returning the array before the data is pushed into the array

Not inexplicable at all, the list won't be filled until an indeterminate amount of time in the future.
The canonical approach is to do the work in your success handler, perhaps by passing in your own callback. You may also use jQuery's .when.

AJAX calls are asynchroneous, which means they don't run with the regular flow of the program. When you execute
if (addresses.length > 0) {
addresses is in fact, empty, as the program did not wait for the AJAX call to complete.