JavaScript Coding

We need a javacript-experienced developer for the following application:

The javascrip application dynamically collects contact information that was submitted in certain forms at specific pages of a website. It will display notification cads at specific pages, showing the data that was collected. Certain URLs will be identified as Data Input URLs (collecting data) while others will be Display URLs (displaying notification cards).

The application's system allows

- The creation and setup of campaigns. Each campaign has specific URLs to draw information of and URLs to display information.

- The system will collect data from certain web pages' visitors. The data which will be collected depends on the setup of each campaign.

There 3 kinds of cards, that will define the type od collected data:

- Conversion Card: collects data that was submitted via forms; collects the time in which the form was submitted;

- Access Card: collects data to display the number of people seeing a page, in real time;

- Time Card: collects the same data as the conversion card, but doesn't display it's information individually. Instead shows the number of people who submitted a certain form in a determined time window (I.E: 123 users have filled this form in the last 24 hours);


The application will identify, at specific URLs, the user acoount's ID, search its campaigns and check if this URL is set as Data Input or Display. In case it is, the application will run, collecting data or displaying notification cards.

It is REALLY IMPORTANT for the application to be safe, to avoid data leaks and account cracking (since the service will have paid subscriptions).


Data Input Pages:

Conversion Cards: The javascript code must collect the following form fields, dinamically, check if the inputted email is a valid address, and then send the collected data to our servers:

Access Cards: The javascript code must collect page access data (number of people visiting the page) and then update the number at the application server.

Time Cards: The javascript code must collect recent form submissions ou visitor count, within a specific time window.


Display Pages:

Each time a visitor enters a page with an URL set as Display URL, the application must check the cards settings within the campaigns and display the notification cards.

It must also track card clicks.

Using a dynamic system (setTimeouts), it must check if there are new cards to be displayed, without repeating cards for the same visitor.

Each card must collect the client's browser IP, browser type (Chrome, Firefox, Opera, Edge, etc), device type, date and time of visit/action/form submit for Data Input and Display.


A few notes

Same-origin policy / CORS: in order to develop the application, for safe server requests, accepting only requests from a specific domain. Develop the application considering the safety of headers and server requests.

The system must be ready for different languages. It must detect the user's browser language and display cards in that language, or display cards according to the cards settings.

The system must detect the user (visitor) device type.

Suggestion: Use a library (addEventListener) for communication between application and javascript.

Use a library (XMLHttpRequest) to send and receive server information.

The application must be compatible with most internet browsers.


Some card samples are attached.

Taidot: AJAX, Koodaus, Javascript, JSON, tietojärjestelmäarkkitehtuuri

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Tietoa työnantajasta:
( 3 arvostelua ) Carazinho, Brazil

Projektin tunnus: #18062260

Myönnetty käyttäjälle:


I'm full-stack developer with a lot of experience in this kind of projects. I'm interested in the project

$400 USD 10 päivässä
(1 arvostelu)

28 freelanceria on tarjonnut keskimäärin %project_bid_stats_avg_sub_26% %project_currencyDetails_sign_sub_27% tähän työhön


Hello, I am expert working on Javascript. I have in-depth knowledge of php, mysql, javascript , jquery, payment system integrations, API's, css, html, html5, wordpress. I will look forward to discuss with you. Thank y Lisää

$500 USD 10 päivässä
(115 arvostelua)

Hello, Hope you are doing well. I can help with you in your project JavaScript Coding. I can assure you the quality job. I have good experience in AJAX, Coding, Javascript, JSON, Software Architecture. We have Lisää

$750 USD 10 päivässä
(44 arvostelua)

Hi! Very interested on your project. As a senior javascript developer with over 5 years experience, I can meet your full requirements. With very familiar to JSON data manipulation, I can make your project with high Lisää

$555 USD 10 päivässä
(16 arvostelua)

Hello, I have gone through description details and would like to confirm few things - Please specify that its mandatory to develop the functionality in pure javascript as you have mentioned XMLHttpRequest - Do you Lisää

$715 USD 12 päivässä
(15 arvostelua)

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$600 USD 15 päivässä
(59 arvostelua)

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$500 USD 2 päivässä
(36 arvostelua)

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$833 USD 10 päivässä
(23 arvostelua)

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$500 USD 10 päivässä
(36 arvostelua)

Dear employer, Thanks for sharing your requirements with us. As per your requirements, I will collect data using Javascript and Ajax. Please start the chat and let me discuss in details. I have 5 years experie Lisää

$300 USD 10 päivässä
(26 arvostelua)

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$555 USD 10 päivässä
(24 arvostelua)

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$500 USD 3 päivässä
(13 arvostelua)

Hi, nice to meet you. I have read your description. I would like to have conversation with chat to get more about your project. Thanks.

$300 USD 5 päivässä
(25 arvostelua)

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$750 USD 10 päivässä
(20 arvostelua)

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$666 USD 3 päivässä
(37 arvostelua)

Hi,dear. I understand your proposals and I am very interested in this job - 'JavaScript Coding'. I am senior software developer and I am able to perform this task in timely manner. Skills: AJAX, Coding, Javascript, JS Lisää

$555 USD 3 päivässä
(3 arvostelua)

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$555 USD 10 päivässä
(4 arvostelua)

Hello, I love to do coding and do this all the time! I have worked in a big company as a Front End Developer for 7years so, I have worked on multiple projects where I'had been apreciated for my work. I have a grea Lisää

$444 USD 10 päivässä
(3 arvostelua)

Hello, I've read your Project Description and I believe I can provide you with the desired results on your website. Embedding the things that you mention won't take me much time. I have rich experience in Javascrip Lisää

$555 USD 10 päivässä
(7 arvostelua)

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$555 USD 13 päivässä
(7 arvostelua)

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$675 USD 12 päivässä
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