基于Vue和Quasar的前端SPA项目实战之拖拽表单定制（十六）
回顾
通过前一篇文章 基于Vue和Quasar的前端SPA项目实战之动态表单（五）的介绍，实现了元数据中动态表单设计功能，支持常见的数据类型和索引，然后实现了动态表单的crud增删改查功能，所有的表单页面都是默认的风格。本文主要介绍拖拽表单定制功能，通过拖拽的方式定制表单录入和编辑页面，满足了个性化需求。
简介
针对元数据表的每个字段，通过拖拽方式决定是否显示或者隐藏，然后还可以配置显示的宽度。最终以json格式保存到后台数据库，运行时根据配置动态渲染录入和编辑表单form页面。针对不同的设备（电脑，平板，手机）都可以单独定制。
UI界面
formbuilder
页面构建
runtime
运行时
代码
说明
采用开源框架vuesortable，基于vue的实现排序，支持拖拽。页面构建分为左中右三个部分，左边为候选字段，中间为需要显示的字段，右边可以针对每个字段单独设置一些属性，比如宽度等。
数据表
创建表单tableFormBuilder，用于存储页面构建json数据，包括类型type、设备device、内容body等字段, 充分利用crudapi功能，API部分零代码实现。
tableFormBuilder
tableFormBuilder
核心代码
页面构建
<draggable
class="dragArea list-group row"
:list="selectedList"
group="people"
@change="log"
>
<div class="list-group-item q-pa-md"
v-for="formElement in selectedList"
:key="formElement.columnId"
:class="formElement | classFormat(currentElement)"
@click="selectForEdit(formElement)"
>
<div>
<div
v-bind:class="{ 'required': !formElement.column.nullable}">
{{formElement.column.caption}}:
</div>
<q-input v-if="isStringType(formElement)"
readonly
:placeholder="formElement.column.description"
:type="formElement.isPwd ? 'password' : 'text'"
v-model="formElement.column.value" >
<template v-slot:append v-if="!formElement.isText" >
<q-icon
:name="formElement.isPwd ? 'visibility_off' : 'visibility'"
class="cursor-pointer"
@click="formElement.isPwd = !formElement.isPwd"
/>
</template>
</q-input>
<q-editor readonly v-else-if="isTextType(formElement)"
v-model="textValue"
:placeholder="formElement.column.description" >
</q-editor>
<q-input v-else-if="isDateTimeType(formElement)" readonly>
<template v-slot:prepend>
<q-icon name="event" class="cursor-pointer">
<q-popup-proxy ref="qDateProxy" transition-show="scale" transition-hide="scale">
<q-date
mask="YYYY-MM-DD HH:mm:ss"
@input="hideRefPopProxyAction('qDateProxy')" />
</q-popup-proxy>
</q-icon>
</template>
<template v-slot:append>
<q-icon name="access_time" class="cursor-pointer">
<q-popup-proxy ref="qTimeProxy" transition-show="scale" transition-hide="scale">
<q-time mask="YYYY-MM-DD HH:mm:ss"
format24h with-seconds
@input="hideRefPopProxyAction('qTimeProxy')" />
</q-popup-proxy>
</q-icon>
</template>
</q-input>
<q-input v-else-if="isDateType(formElement)" readonly>
<template v-slot:append>
<q-icon name="event" class="cursor-pointer">
<q-popup-proxy ref="qDateProxy" transition-show="scale" transition-hide="scale">
<q-date
mask="YYYY-MM-DD"
@input="hideRefPopProxyAction('qDateProxy')" />
</q-popup-proxy>
</q-icon>
</template>
</q-input>
<q-input v-else-if="isTimeType(formElement)" readonly>
<template v-slot:append>
<q-icon name="access_time" class="cursor-pointer">
<q-popup-proxy ref="qTimeProxy" transition-show="scale" transition-hide="scale">
<q-time mask="HH:mm:ss"
format24h with-seconds
@input="hideRefPopProxyAction('qTimeProxy')" />
</q-popup-proxy>
</q-icon>
</template>
</q-input>
<q-toggle v-else-if="isBoolType(formElement)" readonly
v-model="formElement.column.value">
</q-toggle>
<q-input readonly
v-else-if="isNumberType(formElement)"
:placeholder="formElement.column.description"
type="number"
v-model="formElement.column.value" >
</q-input>
<CFile v-else-if="isAttachmentType(formElement)"
v-model="formElement.column.value" >
</CFile>
<q-input v-else
readonly
:placeholder="formElement.column.description"
:type="formElement.isPwd ? 'password' : 'text'"
v-model="formElement.column.value" >
<template v-slot:append v-if="!formElement.isText" >
<q-icon
:name="formElement.isPwd ? 'visibility_off' : 'visibility'"
class="cursor-pointer"
@click="formElement.isPwd = !formElement.isPwd"
/>
</template>
</q-input>
</div>
<div class="row reverse editable-element-action-buttons">
<div class="justify-end q-pt-xs">
<q-btn
@click="deleteElement(formElement)"
v-if="isSelectedForEdit(formElement)"
class="editable-element-button"
color="red"
icon="delete"
round unelevated size="xs">
<q-tooltip>移除</q-tooltip>
</q-btn>
</div>
</div>
</div>
</draggable>
通过draggable标签实现
运行时渲染
<div v-if="selectedList.length > 0" class="row">
<div class="list-group-item q-pa-md"
v-for="formElement in selectedList"
:key="formElement.columnId"
:class="formElement | classFormat">
<div>
<div
v-bind:class="{ 'required': !formElement.column.nullable}">
{{formElement.column.caption}}:
</div>
<div class="row items-baseline content-center"
style="border-bottom: 1px solid rgba(0,0,0,0.12)"
v-if="formElement.column.relationTableName">
<div class="col-11">
<span>{{ formElement.column.value | relationDataFormat(formElement.column) }}</span>
</div>
<div class="col-1">
<q-btn round dense flat icon="zoom_in"
@click="openDialogClickAction(formElement.column)" />
</div>
</div>
<q-input v-else-if="isStringType(formElement.column.dataType)"
v-model="formElement.column.value"
:placeholder="formElement.column.description"
:type="formElement.isPwd ? 'password' : 'text'" >
<template v-slot:append v-if="!formElement.isText" >
<q-icon
:name="formElement.isPwd ? 'visibility_off' : 'visibility'"
class="cursor-pointer"
@click="formElement.isPwd = !formElement.isPwd"
/>
</template>
</q-input>
<q-editor v-else-if="isTextType(formElement.column.dataType)"
v-model="formElement.column.value"
:placeholder="formElement.column.description" >
</q-editor>
<q-input v-else-if="isDateTimeType(formElement.column.dataType)"
v-model="formElement.column.value" >
<template v-slot:prepend>
<q-icon name="event" class="cursor-pointer">
<q-popup-proxy ref="qDateProxy" transition-show="scale" transition-hide="scale">
<q-date v-model="formElement.column.value"
mask="YYYY-MM-DD HH:mm:ss"
@input="hideRefPopProxyAction('qDateProxy')" />
</q-popup-proxy>
</q-icon>
</template>
<template v-slot:append>
<q-icon name="access_time" class="cursor-pointer">
<q-popup-proxy ref="qTimeProxy" transition-show="scale" transition-hide="scale">
<q-time v-model="formElement.column.value"
mask="YYYY-MM-DD HH:mm:ss"
format24h with-seconds
@input="hideRefPopProxyAction('qTimeProxy')" />
</q-popup-proxy>
</q-icon>
</template>
</q-input>
<q-input v-else-if="isDateType(formElement.column.dataType)"
v-model="formElement.column.value">
<template v-slot:append>
<q-icon name="event" class="cursor-pointer">
<q-popup-proxy ref="qDateProxy" transition-show="scale" transition-hide="scale">
<q-date v-model="formElement.column.value"
mask="YYYY-MM-DD"
@input="hideRefPopProxyAction('qDateProxy')" />
</q-popup-proxy>
</q-icon>
</template>
</q-input>
<q-input v-else-if="isTimeType(formElement.column.dataType)"
v-model="formElement.column.value" >
<template v-slot:append>
<q-icon name="access_time" class="cursor-pointer">
<q-popup-proxy ref="qTimeProxy" transition-show="scale" transition-hide="scale">
<q-time v-model="formElement.column.value"
mask="HH:mm:ss"
format24h with-seconds
@input="hideRefPopProxyAction('qTimeProxy')" />
</q-popup-proxy>
</q-icon>
</template>
</q-input>
<q-toggle v-else-if="isBoolType(formElement.column.dataType)"
v-model="formElement.column.value" >
</q-toggle>
<q-input
v-else-if="isNumberType(formElement.column.dataType)"
v-model="formElement.column.value"
:placeholder="formElement.column.description"
type="number">
</q-input>
<CFile v-else-if="isAttachmentType(formElement.column.dataType)"
v-model="formElement.column.value"
@input="(data)=>{
formElement.column.value = data.url;
}"></CFile>
<q-input v-else
v-model="formElement.column.value"
:placeholder="formElement.column.description"
:type="formElement.isPwd ? 'password' : 'text'" >
<template v-slot:append v-if="!formElement.isText" >
<q-icon
:name="formElement.isPwd ? 'visibility_off' : 'visibility'"
class="cursor-pointer"
@click="formElement.isPwd = !formElement.isPwd"
/>
</template>
</q-input>
</div>
</div>
</div>
判断是否存在定制页面，如果存在动态渲染，否则采用默认页面布局。
例子
以产品为例，配置好录入页面之后，运行时原来的默认录入页面用新的页面代替，新的表单页面和之前配置的表单页面一致，功能不受影响，可以正常的录入数据。
小结
本文主要通过拖拽方式实现表单定制功能，使用非常方便，零代码定制表单录入和编辑页面，满足了个性化需求，整个过程无需写代码。
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