JarCasting
Formaker
Introduction
Creating basic HTML forms can be a tedious and repetitive business. Libraries like Spring Framework are very good at automatic data binding but seem to lack much in the way of creating markup for run-of-the-mill forms.
Formaker is a library that when given a POJO (with a couple of optional annotations) will examine the pojo and create a form model (Abstract Form Tree) that may then be rendered to HTML (or potentially JSON or other representation).
This library is not meant to be a one-stop form building solution, it's for simple every day forms. You can use as much or as little of Formaker and also combine it with your own markup where needed.
Styling: Currently the styling is hardcoded for Bootstrap 4 - I plan to make this more flexible.
License
Formaker is Open Source Software released under the MIT License. See the LICENSE file for details.
Example Form
Here's an example form allowing a user to keep track of musical equipment they've spent all their money on:
To create a form like this, firstly create your Form Backing Bean:
package uk.wardm.poc.mykitchensink.model.action;
import uk.wardm.formaker.annotation.Range;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.Size;
import java.time.LocalDate;
public class GearItemChange {
@Size(min = 1, max = 255)
private String brand;
@Size(min = 1, max = 255)
private String model;
@Size(min = 0, max = 255)
private String serialNumber;
private LocalDate purchased;
@Range @Min(1) @Max(5)
private Integer rating;
// ... setters, getters etc. ...
}
Add some user defined properties:
messages.properties
brand=Brand
brand.placeholder=e.g. Yamaha
# Fully qualified message keys (below) will take precedence over short keys (above)
uk.wardm.poc.mykitchensink.model.action.GearItemChange.model=Model
uk.wardm.poc.mykitchensink.model.action.GearItemChange.model.placeholder=e.g. MU50-XG
Define a Thymeleaf template:
<h1>Gear Item</h1>
<form action="#" th:object="${form}" th:action="@{/gear/edit(id=${gearId})}" method="post">
<fm:form-fields fm:form="${form}"/>
<div>
<input class="btn btn-primary" type="submit" value="Save">
<a th:href="@{/gear}" class="btn btn-secondary">Cancel</a>
</div>
</form>
The key here is this line:
<fm:form-fields fm:form="${form}"/>
This expands to the full list of supported fields on the form.
Demo
You can run the demo from within the test source tree, by executing the maven command:
mvn exec:java -Dexec.mainClass=uk.wardm.livetest.TestHarnessApp -Dexec.classpathScope=test
You may also run the demo from your favourite IDE, by running the main class TestHarnessApp.
When the demo is running, you'll be able to use it with your browser at http://localhost:8080/
Installation and Setup
WARNING: This is alpha software, and as such should not be used on production systems.
The easiest way to use the library is from maven or gradle:
<dependency>
<groupId>uk.wardm</groupId>
<artifactId>formaker</artifactId>
<version>1.0.1-alpha</version>
</dependency>
You will need to register the Thymeleaf dialect:
@Configuration
public class MvcConfig implements WebMvcConfigurer {
// ... other config ...
@Bean
public FormakerDialect formObjectModelDialect() {
return new FormakerDialect();
}
}
You should then be able to use it. Note that for the LocalDate support to work, you need a suitable date formatter - one is included and configured in with the demo (see above).