Struct yew_styles::forms::form_component::Form

pub struct Form { /* fields omitted */ }

Form

Features required

forms

Example

use std::collections::HashMap;
use wasm_bindgen::JsCast;
use web_sys::{HtmlOptionElement, HtmlSelectElement};
use yew::prelude::*;
use yew::utils;
use yew_styles::forms::{
    form_component::Form,
    form_group::{FormGroup, Orientation},
    form_input::{FormInput, InputType},
    form_label::FormLabel,
    form_select::FormSelect,
    form_submit::FormSubmit,
    form_textarea::FormTextArea,
};
use yew_styles::layouts::{
    container::{Container, Direction, Wrap},
    item::{Item, ItemLayout},
};
use yew_styles::styles::{Palette, Style};

#[derive(Clone)]
struct Fields {
    first_name: String,
    last_name: String,
    email: String,
    specialty: String,
    skills: Vec<String>,
    cover_letter: String,
}

pub struct BasicFormPage {
    link: ComponentLink<Self>,
    fields: HashMap<String, String>,
    skills: Vec<String>,
    empty_fields: Vec<String>,
    result: Option<Fields>,
}

pub enum Msg {
    FirstName(String),
    LastName(String),
    Email(String),
    Specialty(String),
    Skills(Vec<String>),
    CoverLetter(String),
    Submit,
}

impl Component for BasicFormPage {
    type Message = Msg;
    type Properties = ();

    fn create(_props: Self::Properties, link: ComponentLink<Self>) -> Self {
        Self {
            link,
            fields: HashMap::new(),
            skills: vec![],
            empty_fields: vec![],
            result: None,
        }
    }

    fn update(&mut self, msg: Self::Message) -> ShouldRender {
        match msg {
            Msg::FirstName(first_name) => {
                self.fields.insert("first_name".to_string(), first_name);
            }
            Msg::LastName(last_name) => {
                self.fields.insert("last_name".to_string(), last_name);
            }
            Msg::Email(email) => {
                self.fields.insert("email".to_string(), email);
            }
            Msg::Specialty(specialty) => {
                self.fields.insert("specialty".to_string(), specialty);
            }
            Msg::Skills(skills) => {
                self.skills = skills;
            }
            Msg::CoverLetter(cover_letter) => {
                self.fields.insert("cover_letter".to_string(), cover_letter);
            }
            Msg::Submit => {
                self.empty_fields = get_empty_fields(self.fields.clone());

                if self.empty_fields.is_empty() {
                    self.result = Some(Fields {
                        first_name: self.fields.get("first_name").unwrap().to_string(),
                        last_name: self.fields.get("last_name").unwrap().to_string(),
                        email: self.fields.get("email").unwrap().to_string(),
                        specialty: self.fields.get("specialty").unwrap().to_string(),
                        skills: self.skills.clone(),
                        cover_letter: self.fields.get("cover_letter").unwrap().to_string(),
                    });
                    self.fields.drain();

                    self.skills = vec![];
                    remove_input_values();

                    set_default_selected("specialty");
                    remove_all_selected("skills");
                }
            }
        }

        true
    }

    fn change(&mut self, _props: Self::Properties) -> ShouldRender {
        false
    }

    fn view(&self) -> Html {
        html! {
            <Container wrap=Wrap::Wrap direction=Direction::Row>
                <Item layouts=vec!(ItemLayout::ItXs(12))>
                    <h1>{"Basic Form"}</h1>
                </Item>
                <Item layouts=vec!(ItemLayout::ItXs(12))>
                    <Form onsubmit_signal=self.link.callback(|e| Msg::Submit)>
                        <Container wrap=Wrap::Wrap direction=Direction::Row>
                            <Item layouts=vec!(ItemLayout::ItM(6), ItemLayout::ItXs(12))>
                                <FormGroup orientation=Orientation::Horizontal>
                                    <FormLabel text="First name: "/>
                                    <FormInput
                                        error_state=self.empty_fields.iter().any(|field| field == "first_name")
                                        error_message="First name field is required"
                                        input_type=InputType::Text
                                        oninput_signal=self.link.callback(|e: InputData| Msg::FirstName(e.value))
                                    />
                                </FormGroup>
                                <FormGroup orientation=Orientation::Horizontal>
                                    <FormLabel text="Last name: "/>
                                    <FormInput
                                        error_state=self.empty_fields.iter().any(|field| field == "last_name")
                                        error_message="Last name field is required"
                                        input_type=InputType::Text
                                        oninput_signal=self.link.callback(|e: InputData| Msg::LastName(e.value))
                                    />
                                </FormGroup>
                                <FormGroup orientation=Orientation::Horizontal>
                                    <FormLabel text="Email: "/>
                                    <FormInput
                                        error_state=self.empty_fields.iter().any(|field| field == "email")
                                        error_message="Email field is required"
                                        input_type=InputType::Email
                                        oninput_signal=self.link.callback(|e: InputData| Msg::Email(e.value))
                                    />
                                </FormGroup>
                            </Item>
                            <Item layouts=vec!(ItemLayout::ItM(6), ItemLayout::ItXs(12))>
                                <FormGroup orientation=Orientation::Vertical>
                                    <FormLabel text="Specialty:"/>
                                    <FormSelect
                                        id="specialty"
                                        error_state=self.empty_fields.iter().any(|field| field == "specialty")
                                        error_message="Select specialty is required"
                                        onchange_signal=self.link.callback(|e: ChangeData| {
                                            match e {
                                                ChangeData::Select(element) => {
                                                    let value = element.value();
                                                    Msg::Specialty(value)
                                                },
                                                _ => unreachable!()
                                            }
                                        })
                                        options=html!{
                                            <>
                                            <option value="" disabled=true>{"Choose specialty"}</option>
                                                <option value="frontend">{"Frontend"}</option>
                                                <option value="backend">{"Backend"}</option>
                                            </>
                                        }
                                    />
                                </FormGroup>
                                <FormGroup orientation=Orientation::Vertical>
                                    <FormLabel text="Skills:"/>
                                    <FormSelect
                                        id="skills"
                                        multiple=true
                                        onchange_signal=self.link.callback(|e: ChangeData| {
                                            match e {
                                                ChangeData::Select(element) => {
                                                    let mut values = vec![];
                                                    let options = element.options();

                                                    for i in 0..options.length() {
                                                        let option = options
                                                            .get_with_index(i)
                                                            .unwrap()
                                                            .dyn_into::<HtmlOptionElement>()
                                                            .unwrap();
                                                        if option.selected() {
                                                            values.push(option.value());
                                                        }
                                                    }
                                                    Msg::Skills(values)
                                                },
                                                _ => unreachable!()
                                            }
                                        })
                                        options=html!{
                                            <>
                                                <option value="yew">{"Yew.rs"}</option>
                                                <option value="rustwasm">{"Rustwasm"}</option>
                                                <option value="rust">{"Rust"}</option>
                                                <option value="warp">{"Warp"}</option>
                                                <option value="tokio">{"Tokio"}</option>
                                            </>
                                        }
                                    />
                                </FormGroup>
                            </Item>
                            <Item layouts=vec!(ItemLayout::ItXs(12))>
                                <FormGroup orientation=Orientation::Vertical>
                                    <FormLabel text="Cover letter:"/>
                                    <FormTextArea
                                        error_state=self.empty_fields.iter().any(|field| field == "cover_letter")
                                        error_message="cover letter is required"
                                        oninput_signal=self.link.callback(|e: InputData| Msg::CoverLetter(e.value))/>
                                </FormGroup>
                            </Item>
                            <Item layouts=vec!(ItemLayout::ItXs(12), ItemLayout::ItM(3))>
                                <FormGroup>
                                <FormSubmit
                                    value="Submit application"
                                    submit_palette=Palette::Success
                                    submit_style=Style::Outline
                                />
                                </FormGroup>
                            </Item>
                        </Container>
                    </Form>
                </Item>
                <Item layouts=vec!(ItemLayout::ItXs(12))>
                    {get_result(self.result.clone())}
                </Item>
            </Container>
        }
    }
}

fn get_result(result: Option<Fields>) -> Html {
    if let Some(form) = result {
        html! {
            <Container wrap=Wrap::Wrap direction=Direction::Row>
                <Item layouts=vec!(ItemLayout::ItXs(12))>
                    <p><b>{"First name: "}</b>{form.first_name.clone()}</p>
                    <p><b>{"last name: "}</b>{form.last_name.clone()}</p>
                    <p><b>{"email: "}</b>{form.email.clone()}</p>
                    <p><b>{"Specialty: "}</b>{form.specialty.clone()}</p>
                    <p><b>{"Skills: "}</b>{form.skills.join(", ")}</p>
                    <p><b>{"Cover letter: "}</b>{form.cover_letter}</p>
                </Item>
            </Container>
        }
    } else {
        html! {}
    }
}

fn get_empty_fields(fields: HashMap<String, String>) -> Vec<String> {
    let total_fields = vec![
        "first_name",
        "last_name",
        "email",
        "specialty",
        "cover_letter",
    ];
    let mut empty_fields: Vec<String> = vec![];

    for field in total_fields {
        let is_filled = fields
            .iter()
            .any(|(key, value)| key == field && !value.is_empty());
        if !is_filled {
            empty_fields.push(field.to_string());
        }
    }

    empty_fields
}

fn remove_all_selected(select: &str) {
    let specialty_form_element = utils::document()
        .get_element_by_id(select)
        .unwrap()
        .dyn_into::<HtmlSelectElement>()
        .unwrap();
    let specialty_options = specialty_form_element.options();

    for i in 0..specialty_options.length() {
        let option = specialty_options
            .get_with_index(i)
            .unwrap()
            .dyn_into::<HtmlOptionElement>()
            .unwrap();

        option.set_selected(false);
    }
}

fn remove_input_values() {
    let input_ids = vec!["first-name", "last-name", "email"];
     
    for id in input_ids {
        let input_from_element = utils::document()
            .get_element_by_id(id)
            .unwrap()
            .dyn_into::<HtmlInputElement>()
            .unwrap();
     
        input_from_element.set_value("");
    }
     
    let textarea = utils::document()
        .get_element_by_id("cover-letter")
        .unwrap()
        .dyn_into::<HtmlTextAreaElement>()
        .unwrap();
     
    textarea.set_value("");
}

fn set_default_selected(select: &str) {
    let specialty_form_element = utils::document()
        .get_element_by_id(select)
        .unwrap()
        .dyn_into::<HtmlSelectElement>()
        .unwrap();
    let specialty_options = specialty_form_element.options();

    let option = specialty_options
        .get_with_index(0)
        .unwrap()
        .dyn_into::<HtmlOptionElement>()
        .unwrap();

    option.set_selected(true);
}

Trait Implementations

impl Component for Form

type Message = Msg

Messages are used to make Components dynamic and interactive. Simple Component’s can declare their Message type to be (). Complex Component’s commonly use an enum to declare multiple Message types.

type Properties = Props

Properties are the inputs to a Component and should not mutated within a Component. They are passed to a Component using a JSX-style syntax.

fn create(props: Self::Properties, link: ComponentLink<Self>) -> Self

Components are created with their properties as well as a ComponentLink which can be used to send messages and create callbacks for triggering updates.

fn update(&mut self, msg: Self::Message) -> ShouldRender

Components handle messages in their update method and commonly use this method to update their state and (optionally) re-render themselves.

fn change(&mut self, props: Self::Properties) -> ShouldRender

When the parent of a Component is re-rendered, it will either be re-created or receive new properties in the change lifecycle method. Component’s can choose to re-render if the new properties are different than the previously received properties. Most Component’s will use props with a PartialEq impl and will be implemented like this:

fn view(&self) -> Html

Components define their visual layout using a JSX-style syntax through the use of the html! procedural macro. The full guide to using the macro can be found in Yew’s documentation.

fn rendered(&mut self, _first_render: bool)

The rendered method is called after each time a Component is rendered but before the browser updates the page.

fn destroy(&mut self)

The destroy method is called right before a Component is unmounted.