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Building Scalable Applications with Thymeleaf and Spring Boot

Static Server-Side Rendering - I

Explore how to expand team editing forms using static server-side rendering with Thymeleaf. Learn to model player data with form objects, apply validation annotations, and update HTML templates. Understand how to integrate these forms with Spring Boot controllers and prepare your application for dynamic team management.

We'll cover the following...

Expanding the form

The form that edits a Team has the backing form objects CreateTeamFormData and EditTeamFormData. To allow for adding and editing of the users on that team, we’ll need to expand those objects.

Single player data

We’ll start by creating TeamPlayerFormData which contains the information of a single player and their position on the team:

Java
package com.tamingthymeleaf.application.team.web;
import com.tamingthymeleaf.application.team.PlayerPosition;
import com.tamingthymeleaf.application.team.TeamPlayer;
import com.tamingthymeleaf.application.user.UserId;
import javax.validation.constraints.NotNull;
public class TeamPlayerFormData {
    @NotNull
    private UserId playerId;
    @NotNull
    private PlayerPosition position;
    public UserId getPlayerId() {
        return playerId;
    }
    public void setPlayerId(UserId playerId) {
        this.playerId = playerId;
    }
    public PlayerPosition getPosition() {
        return position;
    }
    public void setPosition(PlayerPosition position) {
        this.position = position;
    }
    public static TeamPlayerFormData fromTeamPlayer(TeamPlayer player) {
        TeamPlayerFormData result = new TeamPlayerFormData();
        result.setPlayerId(player.getPlayer().getId());
        result.setPosition(player.getPosition());
        return result;
    }
}

We can now use this in CreateTeamFormData to model the information of the players in the HTML form:

Java
package com.tamingthymeleaf.application.team.web;
import com.tamingthymeleaf.application.user.UserId;
import javax.validation.Valid;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
public class CreateTeamFormData {
    @NotBlank
    @Size(max = 100)
    private String name;
    @NotNull
    private UserId coachId;
    @NotNull
    @Size(min = 1)
    @Valid
    private TeamPlayerFormData[] players; //<.>
    public CreateTeamFormData() {
        this.players = new TeamPlayerFormData[]{new TeamPlayerFormData()}; //<.>
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public UserId getCoachId() {
        return coachId;
    }
    public void setCoachId(UserId coachId) {
        this.coachId = coachId;
    }
    public TeamPlayerFormData[] getPlayers() {
        return players;
    }
    public void setPlayers(TeamPlayerFormData[] players) {
        this.players = players;
    }
}

  • Use an array of TeamPlayerFormData objects to store the information that will be edited in the HTML form. The ...