Hello everyone!
Thank you for visiting our Building Extensions series. As part of this series, we've already covered how to use the Sigma cloud editor and the ZET CLI to create, test, and publish extensions for Zoho Projects. You can refer to our earlier posts for more details. We will now explore the core functionalities available to customize Zoho Projects extensions using the Sigma cloud editor approach.
Extension development: Broad objective
The comprehensive goal of extension development is generally to build tight integrations that can provide additional capabilities and make end users' work simpler and more productive. By integrating functional and technical provisions at the development end, extensions can subsequently be installed as part of the end user's Zoho Projects portal, allowing them to carry out additional functionalities while ensuring a seamless user experience.
So far, we've learned how to develop, test, and publish an extension. Now, let's look at the fundamental features of a Zoho Projects extension developed using the Sigma cloud editor.
Core features for customizing a Zoho Projects extension
In general, apps require data to function properly and carry out organizational tasks. This data must be acquired from reliable sources, analyzed, modified using logic functionalities when needed, and finally saved in order to be retrieved for future operations or business reports.
Some of the fundamental elements for customizing Zoho Projects extensions to carry out the tasks outlined above are:
- Tightly coupled integration
- Customized user interface
- Logical functionalities
- Event-based executions
- Data storage management
- Handling dialog box/pop window
Tightly coupled integration: A tightly coupled integration allows applications to be dependent on each other while ensuring a seamless and optimal exchange of information.
- The Connections feature is essential when looking to develop an integration between Zoho Projects and another application through an extension.
- You can connect with third-party applications or other Zoho products to perform activities that use data from other applications.
- You can also establish connections for many applications and utilize them as part of a single extension. This creates a safe connection between Zoho Projects and other applications, allowing for seamless data functionality.
Customized user interface: A customized user interface with personalized features and components allows for a more simplified and direct approach to the end user.
- Widgets are graphical user interface components that help users easily access a product and perform functionalities.
- You can create custom widgets and have them embedded in different locations in your extension. View the multiple locations where you can embed a widget here.
- Zoho Projects also offers JS SDK for your javascript widget code to communicate with your extension.
Logical functionalities: Implementing an ideal concept requires the execution of a few to several fundamental blocks of logical functions.
- Functions are blocks of code that help you perform a functionality.
- You could write functions, leverage connections as part of functions to perform third-party operations, or utilize Deluge integration tasks to fulfill your functionality.
- Finally, the function must be associated with the extension in order to be used in the extension.
Event-based executions: Executing logical functionalities based on an event enables the execution of triggers, the automation of work, and the avoidance of manual supervision.
- Triggers help execute functions in the occurrence of an event.
- You can create triggers, associate it with an event, and then associate a function to the trigger to have it executed on occurrence of that event.
- Check out the list of available trigger events here.
Data storage management: Managing and storing data plays a vital role in carrying out any operation smoothly and efficiently.
- Data storage allows you to save data or properties of an extension or entity.
- The extension property can be used to store app/extension-level data, and the entity property can be used to store entity-level data.
- Data storage is accomplished through the use of key-value pairs. The keys must be unique, and the values must be in JSON format.
Handling dialog box/pop window: Modal boxes are useful in instances where you need to prompt a dialog box that communicates data from the main application while holding control until the user completes an operation.
- Using the modal box, you can create a new iframe instance of the extension.
- You can use modal boxes to send and receive data from one widget to another, allowing for inter-widget communication.
- To create a new instance for the widget, send data to a widget, and receive or listen to data from a widget, Zoho Projects provides many methods such as instance, emit, and so on.
In this post, we looked at the major features that may be achieved using a Zoho Projects extension. We hope you found this information useful. In our upcoming posts, we will explain each feature in detail with example use cases. Continue to monitor this space for updates!

Sign up for a
Zoho Developer account and start developing extensions for Zoho products using Sigma.
SEE ALSO:
Recent Topics
Professional Plan not activated after payment
I purchased the Professional Plan for 11 users (Subscription ID: RPEU2000980748325) on 12 September 2025, and the payment has been successfully processed. However, even after more than 24 hours, my CRM account still shows “Upgrade” and behaves like a
Zoho Books - France
L’équipe de Zoho France reçoit régulièrement des questions sur la conformité de ses applications de finances (Zoho Books/ Zoho Invoice) pour le marché français. Voici quelques points pour clarifier la question : Zoho Books est un logiciel de comptabilité
how to edit the converted lead records?
so I can fetch the converted leads records using API (COQL), using this endpoint https://www.zohoapis.com/crm/v5/coql and using COQL filter Converted__s=true for some reasons I need to change the value from a field in a converted lead record. When I try
Auto Update Event Field Value on Create/Edit
Hi there, I know this question has been posted multiple times and I've been trying many of the proposed similar scripts for a while now but nothing seems to work... what might I do wrong? The error I receive is this: Value given for the variable 'meetingId'
Pre-orders at Zoho Commerce
We plan to have regular producs that are avaliable for purchase now and we plan to have products that will be avaliable in 2-4 weeks. How we can take the pre-orders for these products? We need to take the money for the product now, but the delivery will
Constant color of a legend value
It would be nice if we can set a constant color/pattern to a value when creating a chart. We would often use the same value in different graph options and I always have to copy the color that we've set to a certain value from a previous graph to make
Zoho Pagesense really this slow??? 5s delay...
I put the pagesense on my website (hosted by webflow and fast) and it caused a 5s delay to load. do other people face similar delays?
Payroll and BAS ( Australian tax report format )
Hello , I am evaluating Zoho Books and I find the interface very intuitive and straight forward. My company is currently using Quickbooks Premier the Australian version. Before we can consider moving the service we would need to have the following addressed : 1.Payroll 2.BAS ( business activity statement ) for tax purposes 3.Some form of local backup and possible export of data to a widely accepted format. Regards Codrin Mitin
Problem with Email an invoice with multiple attachments using API
I have an invoice with 3 attachments. When I send an email manually using the UI, everything works correctly. I receive an email with three attachments. The problem occurs when I try to initiate sending an email using the API. The email comes with only
Page Layouts for Standard Modules like CRM
For standard modules like quotes, invoices, purchase orders, etc, it would be a great feature to be able to create custom page layouts with custom fields in Zoho Books similar to how you can in Zoho CRM. For example, and my current use case, I have a
Non-depreciating fixed asset
Hi! There are non-depreciable fixed assets (e.g. land). It would be very useful to be able to create a new type of fixed asset (within the fixed assets module) with a ‘No depreciation’ depreciation method. There is always the option of recording land
Fixed asset management
I want to know if there is any individual module for fixed assets management
One time sale item in billing automatically detects as service
if i have some items which i don't want to add in my "item" list because its sold only for one time. but when i type item name in invoice, it (system) automatically takes it as a service and despite of HSN , it shows SAC code to be entered. if its selectable i.e. either item or service , it would be very helpful and a must have feature.
Project template after project creation
How can I apply a project template AFTER the project has been created?
convert the project to templet
i have some deployment ME product for different customer , i need to create a fixed template for use it rather then keeping creating this template every time
Is there a notification API when a new note is addeding
Trying to push to Cliq, or email notification when there's a new note added in module. How to implement this?
Seriously - Create multiple contacts for leads, (With Company as lead) Zoho CRM
In Zoho CRM, considering a comapny as a lead, you need us to allow addition of more than one contact. Currently the Lead Section is missing "Add contact" feature which is available in "Accounts". When you know that a particular lead can have multiple
Related Module in Sharing Rules
Zoho CRM team recently added the feature to filter records by Related Records It will be really beneficial if we can have this feature for Sharing Rules as well
Assignment Thresholds Resetting After Lead Conversion
Hello everyone, We're facing an issue with Zoho CRM's lead assignment thresholds that makes them unsuitable for our workflow. I'm hoping to find a potential workaround or solution from the community. Here’s our current process: A new lead is created automatically
Vendor Signatures Needed for Purchase Orders
Hello everyone, We have a unique requirement that necessitates that Vendors & Suppliers formally acknowledge our Purchase Orders upon receipt. I was hoping that there would be an option to do so in Zoho Books, but that does not appear to be the case.
Zoho CRM Analytics - Allow To Reorder Dashboards
I would like to suggest that you add the ability to reorder dashboards in the Analytics Module. I can see that this has been requested some time ago, the latest 9 years ago. I am not sure if this is a big or small endeavor, but such a small fix can go
Territory view for custom modules?
I have recently activated territories however I can't seem to find how to use territories for custom modules? These modules have territories: Contacts / Accounts / Opportunities These modules don't have territories: Buildings (custom module) and
Zoho Books - How to Invoke a Custom Function in Schedulers
We have multiple schedulers that send emails to customers in batches. Currently, we are maintaining the same code across several schedulers. Is it possible to use a custom function inside a scheduler script? If yes, how can we invoke the custom function
Approval Process Comments
Is it possible to view the comments entered during the approval or rejection of a record in the approval process? If not, is there a way to require a field to be completed upon approval or rejection?
Login for test case
Had a few questions regarding authentication test cases and couldn't find an answer in the the docs. 1. If an app like Zoho Creator requires authentication before providing access, do I need to create a login function and add it to each test case? 2.
Zoho / Outlook Calendar sync
The current Marketplace -> Microsoft -> Meetings integration needs 2 changes. 1. The current language for the Two-Way sync option should be changed. It currently states, "Sync both your Zoho CRM Calendar and Office 365 Calendar meetings with each other."
GST Slabs Redefined: Stay Compliant Using Zoho Books!
Hello Everyone! The Government of India is rolling out new GST rates, a major reform aimed at simplifying the current tax structure starting 22 September 2025. GST will move from four slabs (5%, 12%, 18%, 28%) to two main slabs (5% and 18%), plus a special
Form Rules for Suburb Categories to alternate landing pages or Making a Fields Contents ALL CAPS
I need to send differentform submissions to two to three different thank-you URLs (for Meta/Google pixels) depending on which suburb a user selects in a form. I have ~400 suburbs split into two categories (A and B, based on business value). Current challenges:
Please make it easier to Pause syncing
right now it takes 3 clicks to get there. sounds silly, but can you make it just 2 clicks to get it done instead? thats how dropbox does it, 2 clicks to pause instead of 3.
Customer members area
Does FSM support a customer members area? If not what do you propose we use if we want the data used in FSM for customers to give them an area / login to see past orders, create new orders and general announcements.
Zoho Books-Accounting on the Go Series!
Dear users, Continuing in the spirit of our 'Function Fridays' series, where we've been sharing custom function scripts to automate your back office operations, we're thrilled to introduce our latest initiative – the 'Zoho Books-Accounting on the Go Series'.
Record Logged in User while using CRM lookup field
Is it possible, while using the Zoho CRM lookup field, to automatically use the user account logged into Zoho CRM in a hidden field? I was hoping to add employee accounts to my current plan. But would like a record on the Form submission of who submitted
Desktop app doesn't support notecards created on Android
Hi, Does anybody have same problem? Some of last notecards created on Android app (v. 6.6) doesn't show in desktop app (v. 3.5.5). I see these note cards but whith they appear with exclamation mark in yellow triangle (see screenshot) and when I try to
Notes created in mobile can no longer be accessed in desktop
Working with a 2013 Mac running OS 10.14.6; Desktop Notebook version 4.5.3. Using Motorola Moto G Power 5G - 2024; Android app version 6.7 I have been using Notebook for some years. Starting several weeks ago, the notes newly created ion the phone can
Function #49: Manage varying installment payments using Zoho Books
. Hello everyone, and welcome back to our series! Last week, we discussed automating the collection of fixed installment payments in Zoho Books. But what if your payment structure involves charging varying percentages of the invoice total as installments?
Open Sans Font in Zoho Books is not Open Sans.
Font choice in customising PDF Templates is very limited, we cannot upload custom fonts, and to make things worse, the font names are not accurate. I selected Open Sans, and thought the system was bugging, but no, Open Sans is not Open Sans. The real
Zoho Writer - Option to Export as .zdoc format
I've noticed that it's not possible to export a Zoho Writer Document in the .zdoc format. Isn't zdoc, Zoho Writer's own format? My use case is that I sometimes need to create quite complex documents with floating elements, which sometimes need to become
Is it possible for contacts to "Re-enter" a workflow in Zoho Campaign?
We are currently working on a way to automatically add users to from one list to other lists based on specific criteria, but can't seem to find a native way of doing this so we are trying to use Workflows to do this. So, for example, if a user's status is set to "Active," then they should be added to the list "Active Users." If the same user's status is then set to "Paused," they should be added to the list "Paused Users" and removed from the list "Active Users." This works fine for the first go
Bulk upload images and specifications to products
Hi, Many users have asked this over the years and I am also asking the same. Is there any way in which we can bulk upload product (variant) images and product specifications. The current way to upload/select image for every variant is too cumbersome.
Out of Office for Just One of My Alias Email
Can I set up the Out of Office Reply for Just One of my Alias Email Addresses?
Next Page