What Is Data Dojo Type?


Larry Thompson

What Is Data Dojo Type?

Data Dojo Type is a powerful feature of the Dojo Toolkit, which is a popular JavaScript framework used for building dynamic web applications. It provides a way to define custom data types and perform validation on input fields within an application. With Data Dojo Type, you can ensure that the data entered by users meets specific criteria, such as being a valid email address or a number within a certain range.

Why Use Data Dojo Type?

Data Dojo Type offers several benefits when it comes to form validation and data handling in web applications. Here are some key reasons why you should consider using it:

  • Consistent Validation: By defining custom data types, you can ensure that the same validation rules are applied consistently across different input fields within your application.
  • Error Prevention: Data Dojo Type helps prevent errors by validating user input before submitting it to the server. This saves time and resources by reducing the number of server-side requests for invalid data.
  • User-Friendly Experience: With proper validation messages, users can easily understand what went wrong when their input doesn’t meet the required criteria.

    This improves user experience and reduces frustration.

  • Flexibility: Data Dojo Type allows you to create your own custom data types based on your application’s specific requirements. You can define complex validation patterns and rules tailored to your needs.

Defining Data Dojo Types

To define a new Data Dojo Type, you need to use the `dojo/validate` module provided by the Dojo Toolkit. Here’s an example of how to define a simple email address type:

define(["dojo/validate"], function(validate) {
  validate.addValidator("email", function(value, constraints) {
    if (!value) return false;
    return validate.isEmailAddress(value);

In the above code, we first import the `dojo/validate` module. Then, we use the `addValidator` function to define a new validator called “email”. The validator takes two arguments: `value`, which represents the input value to be validated, and `constraints`, which can be used to pass additional parameters if needed.

Inside the validator function, we check if the value exists and then use the `isEmailAddress` method from the `dojo/validate` module to perform the actual email validation. If the validation passes, we return true; otherwise, we return false.

Using Data Dojo Types

Once you have defined a Data Dojo Type, you can use it to validate input fields within your application. To apply a Data Dojo Type to an input field, you need to set its `data-dojo-type` attribute with the name of your custom type. Here’s an example:

<input type="text" data-dojo-type="email" />

In this case, we have applied the “email” type to a text input field. When a user enters data into this field and tries to submit the form, Data Dojo Type will automatically validate whether it is a valid email address or not.

Cross-Field Validation

Data Dojo Type also supports cross-field validation where you can define rules that depend on multiple fields. For example, you can create a custom type that checks if two password fields match:

define(["dojo/validate"], function(validate) {
  validate.addValidator("passwordMatch", function(value, constraints) {
    var password = document.getElementById("password").value;
    return value === password;

In this case, the “passwordMatch” validator compares the value of the current field with the value of the password field (with an id of “password”). If they match, it returns true; otherwise, it returns false.

To use this validator, you would apply it to the second password field:

<input type="password" id="password" />
<input type="password" data-dojo-type="passwordMatch" />

Now, when a user enters a value in the second password field, Data Dojo Type will validate if it matches the value in the first password field.


Data Dojo Type is a valuable feature provided by the Dojo Toolkit for form validation and data handling. It allows you to define custom data types and perform validation on input fields with ease. By utilizing Data Dojo Type effectively, you can provide a consistent and user-friendly experience for your web application users while ensuring that data meets specific criteria.

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