Form Input

====== Spring Form Input ====== ===== build.gradle ===== Include those in the dependencies. We need the javax.validation library for error handling.


    implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
    implementation 'org.springframework.boot:spring-boot-starter-web'
    compile group: 'javax.validation', name: 'validation-api', version: '2.0.1.Final'

===== Create a Class that Match the input of a form ===== Here we have a Cat class that has field id, name, breed, and date of birth.


package com.example.formsubmit

import org.springframework.format.annotation.DateTimeFormat

class Cat {
    private long id
    private String name
    private String breed
    @DateTimeFormat(pattern = "yyyy-MM-dd")
    private Date dateOfBirth

    long getId() { return id }
    void setId(long id) { this.id = id }
    String getName() { return name }
    void setName(String name) { this.name = name }
    String getBreed() { return breed }
    void setBreed(String breed) { this.breed = breed }
    Date getDateOfBirth() { return dateOfBirth }
    void setDateOfBirth(Date dateOfBirth) { this.dateOfBirth = dateOfBirth }
}

===== Create the Controller ===== This controller takes a get, and a post method for path "/". We use thymeleaf for view here. For error handling we need to @Valid, and BindingResult. We can use bindingResult to see which fields have errors, we do not show it here.


@Controller
class HomeController {

    @GetMapping("/")
    inputCat(Model model) {
        model.addAttribute("cat", new Cat())
        return "inputForm"
    }

    @PostMapping("/")
    showSubmittedCat(@Valid Cat cat, BindingResult bindingResult, Model model) {
        if (bindingResult.hasErrors()) {
            model.addAttribute("errorMsg", "INPUT ERROR!")
            return "inputForm"
        }
        return "submittedForm"
    }
}

===== Creating thymeleaf template ===== Form input UI:





    
    Form Input





    ID:
    Name:
    Breed:
    Date of birth:

Display the submitted form:





    
    Submitted Form