Symfony5 Form multiple select (choices list) data auto-update with AJAX

Question

我有一个包含三个“select”（选择列表）的位置表单：国家、地区和部门。这些“select”默认包含国家、地区和部门的所有列表。我想让我的用户先选择国家或地区或部门。

我想做的事情：
当用户选择一个国家时，地区数据会随之改变。地区和部门之间相同。

我有：

当我先选择一个国家然后选择一个地区时，数据自动更新在国家和地区之间起作用但是对于地区到部门，AJAX 请求未启动。
但是如果我直接选择一个区域然后启动AJAX请求但是它不会更新部门[=39=中的数据].

但是，在表格中，当我评论有关国家和地区自动更新的部分时，启动了 AJAX 请求，并且地区和部门之间的自动更新工作。

这是我的表格：

//src/Form/LocationType.php class LocationType extends AbstractType { public function buildForm(FormBuilderInterface $builder, array $options) { $builder ->add('country', EntityType::class, [ 'class' => Country::class, ]) ->add('area', EntityType::class, [ 'class' => Area::class, 'required' => false ]) ->add('department', EntityType::class, [ 'class' => Department::class, 'required' => false ]); //The part I comment for makes the auto-update between area and department works $formArea = function(FormInterFace $form, Country $country = null) { if($country === null) { $form->add('area', EntityType::class, [ 'class' => Area::class, 'required' => false ]); } else { $areas = $country->getAreas(); $form->add('area', EntityType::class, [ 'class' => Area::class, 'choices' => $areas, 'required' => false ]); } }; $builder->get('country')->addEventListener( FormEvents::POST_SUBMIT, function (FormEvent $event) use ($formArea){ $country = $event->getForm()->getData(); $formArea($event->getForm()->getParent(), $country); } ); // $formDepartment = function(FormInterFace $form, Area $area = null) { if($area === null) { $form->add('department', EntityType::class, [ 'class' => Department::class, 'required' => false ]); } else { $departments = $area->getDepartments(); $form->add('department', EntityType::class, [ 'class' => Department::class, 'choices' => $departments, 'required' => false ]); } }; $builder->get('area')->addEventListener( FormEvents::POST_SUBMIT, function (FormEvent $event) use ($formDepartment){ $area = $event->getForm()->getData(); $formDepartment($event->getForm()->getParent(), $area); } ); }

和 AJAX 调用的 JS 代码：

//assets/js/selectCountryAreaDepartment.js window.onload = () => { let country = document.querySelector("#location_country"); country.addEventListener("change", function() { let form = this.closest("form"); let data = this.name + "=" + this.value; console.log(data); fetch(form.action, { method: form.getAttribute("method"), body: data, headers: { "Content-Type": "application/x-www-form-urlencoded; charset:UTF-8" } }) .then(response => response.text()) .then(html => { let content = document.createElement("html"); content.innerHTML = html; let area = content.querySelector("#location_area"); document.querySelector("#location_area").replaceWith(area); console.log(area); }) .catch(error => { console.log(error); }) }); let area = document.querySelector("#location_area"); area.addEventListener("change", function() { let formArea = this.closest("form"); let dataArea = this.name + "=" + this.value; //console.log(formArea); console.log(dataArea); fetch(formArea.action, { method: formArea.getAttribute("method"), body: dataArea, headers: { "Content-Type": "application/x-www-form-urlencoded; charset:UTF-8" } }) .then(response => response.text()) .then(html => { let contentArea = document.createElement("html"); contentArea.innerHTML = html; let department = contentArea.querySelector("#location_department"); document.querySelector("#location_department").replaceWith(department); console.log(department); }) .catch(error => { console.log(error); }) }); }

此代码基于此法语教程：https://www.youtube.com/watch?v=f7tdb30evUk

Answer 1

通过删除 add() 在 formModifiers formArea 和 formDepartment 它避免在使用另一个 select 时“重置”select：

//src/Form/LocationType.php
// …
        // formModifier
        $formArea = function(FormInterFace $form, LocationCountry $country = null) {
            if($country != null)
            {
                $areas = $country->getAreas();
            $form->add('area', EntityType::class, [
                'class' => LocationArea::class,
                'choices' => $areas,
                'placeholder' => 'select now an area',
                'required' => false
            ]);
            }
        };

        $builder->get('country')->addEventListener(
            FormEvents::POST_SUBMIT,
            function (FormEvent $event) use ($formArea){
                $country = $event->getForm()->getData();
                $formArea($event->getForm()->getParent(), $country);
            }
        );

        // formModifier
        $formDepartment = function(FormInterFace $form, LocationArea $area = null) {
            if($area != null) 
            {
                $departments = $area->getDepartments();
            $form->add('department', EntityType::class, [
                'class' => LocationDepartment::class,
                'choices' => $departments,
                'placeholder' => 'select now a department',
                'required' => false,
                'choice_label' => function ($departments) {
                    return '['.$departments->getCode().']-'.$departments->getName();
                }
            ]);
            }
        };

更新区select删除了area.addEventListener，所以需要re-activate更新区select后的eventListener，所以我创建了一个函数area_addEnventListener()

window.onload = () => {
    let country = document.querySelector("#location_country");

    country.addEventListener("change", function() {
        let form = this.closest("form");
        let data = this.name + "=" + this.value;
        fetch(form.action, {
            method: form.getAttribute("method"),
            body: data,
            headers: {
                "Content-Type": "application/x-www-form-urlencoded; charset:UTF-8"
            }
        })
        .then(response => response.text())
        .then(html => {
            let content = document.createElement("html");
            content.innerHTML = html;
            let area = content.querySelector("#location_area");
            document.querySelector("#location_area").replaceWith(area);
            area_addEnventListener(area);
        })
        .catch(error => {
            console.log(error);
        })
    });

    let area = document.querySelector("#location_area");

    area_addEnventListener(area);
}

function area_addEnventListener(area_select) {
    area_select.addEventListener("change", function() {
        let formArea = area_select.closest("form");
        let dataArea = area_select.name + "=" + area_select.value;
        fetch(formArea.action, {
            method: formArea.getAttribute("method"),
            body: dataArea,
            headers: {
                "Content-Type": "application/x-www-form-urlencoded; charset:UTF-8"
            }
        })
        .then(response => response.text())
        .then(html => {
            let contentArea = document.createElement("html");
            contentArea.innerHTML = html;
            let department = contentArea.querySelector("#location_department");
            document.querySelector("#location_department").replaceWith(department);
        })
        .catch(error => {
            console.log(error);
        })
    });
}

Symfony5 Form multiple select (choices list) data auto-update with AJAX

Symfony5 Form multiple select (choices list) data auto-update with AJAX

javascript

ajax

symfony

symfony-forms

symfony5