Salesforce学习 Lwc（三）自定义开发时进行Validation验证

原创

repick

修改于 2020-12-30 03:08:18

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代码可运行

文章被收录于专栏：SalesforceSalesforce

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代码可运行

关于自定义开发过程中，是否可以实现自定义validation验证。

我们在使用【lightning-record-edit-form】标签开发过程中，表单提交之后，画面输入的内容不符合要求时，error信息显示在项目上。

例：必须项目未输入

lwc代码如下：

<template>
  <lightning-record-edit-form record-id={recordId} object-api-name="Opportunity"
  onsubmit={handleSubmit}>
      <lightning-messages></lightning-messages>
      <lightning-layout multiple-rows="true">
          <lightning-layout-item size="6">
              <lightning-input-field field-name="Name"></lightning-input-field>
          </lightning-layout-item>
          <lightning-layout-item size="6">
              <lightning-input-field field-name="OrderNumber__c"></lightning-input-field>
          </lightning-layout-item>
          <lightning-layout-item size="12">
              <div class="slds-m-top_medium">
                  <lightning-button class="slds-m-top_small" label="Cancel"
                  onclick={handleReset}></lightning-button>
                  <lightning-button class="slds-m-top_small" type="submit"
                  label="Save Record"  onclick={handleClick}></lightning-button>
              </div>
          </lightning-layout-item>
      </lightning-layout>
  </lightning-record-edit-form>
</template>

import { LightningElement,track,api,wire } from 'lwc';
import { updateRecord,getRecord } from 'lightning/uiRecordApi';
import { ShowToastEvent } from 'lightning/platformShowToastEvent';
import { NavigationMixin } from 'lightning/navigation';
import OPPORTUNITY_ID_FIELD from '@salesforce/schema/Opportunity.Id';
import OPPORTUNITY_NAME_FIELD from '@salesforce/schema/Opportunity.Name';
import OPPORTUNITY_ORDER_NUMBER_FIELD from '@salesforce/schema/Opportunity.OrderNumber__c';
const fields = [
    OPPORTUNITY_ID_FIELD,
    OPPORTUNITY_NAME_FIELD,
    OPPORTUNITY_ORDER_NUMBER_FIELD
];
export default class OpportunityDetailEditWithEditForm extends NavigationMixin(LightningElement) {

    @api recordId = '0066g00000GQ4GyAAL';
    @track isShowErrorDiv = false;
    @track errorMessageList = [];

    @track isFormValid = true;

    handleSubmit(event) {
        event.preventDefault();
        if(!this.isShowErrorDiv) {
            const fields = {};
            fields[OPPORTUNITY_ID_FIELD.fieldApiName] = this.recordId;
            fields[OPPORTUNITY_NAME_FIELD.fieldApiName] = event.detail.Name;
            fields[OPPORTUNITY_ORDER_NUMBER_FIELD.fieldApiName] = event.detail.OrderNumber__c;
            const recordInput = { fields };
            this.errorMessageList = [];
            this.isShowErrorDiv = false;
            updateRecord(recordInput)
            .then(() => {
                this.dispatchEvent(
                    new ShowToastEvent({
                        title: 'Success',
                        message: 'Opportunity updated',
                        variant: 'success'
                    })
                );
            }).catch(error => {
                //
            });
        }
    }
    handleReset(event) {
        const inputFields = this.template.querySelectorAll(
            'lightning-input-field'
        );
        if (inputFields) {
            inputFields.forEach(field => {
                field.reset();
            });
        }
    }
}

这种情况，跟标准UI有一定的区别，下边是标准UI，如图所示，画面头部也有显示error信息。

解决方法：首先开发error显示用lwc画面，然后在表单提交按钮上增加【onclick】事件，因为onclick事件会优先于onsubmit被执行。所以画面上的validation验证可以在onclick事件中执行，验证成功之后，会执行onsubmit

error页面的lwc：

errorMessageModal.html

<template>
  <template if:true={isShowErrorDiv}>
      <div class="pageLevelErrors" tabindex="-1" >
          <div class="desktop forcePageError" aria-live="assertive" data-aura-class="forcePageError">
              <div class="genericNotification">
                  <span class="genericError uiOutputText" data-aura-class="uiOutputText">
                      このページのエラーを確認してください。
                  </span>
              </div>
              <template if:true={isShowMessage}>
                  <ul class="errorsList">
                      <template for:each={errorMessageList} for:item="errorMessageItem">
                          <li key={errorMessageItem}>{errorMessageItem}</li>
                      </template>
                  </ul>
              </template>

          </div>
      </div>
  </template>
</template>

errorMessageModal.js

import { LightningElement,api,track } from 'lwc';

export default class ErrorMessageModal extends LightningElement {
  @api isShowErrorDiv = false;
  @api errorMessageList = [];
  @track isShowMessage = false;
  renderedCallback() {
      if(this.errorMessageList && this.errorMessageList.length > 0) {
          this.isShowMessage = true;
      } else {
          this.isShowMessage = false;
      }
  }
}

errorMessageModal.css

.forcePageError {
  border-bottom: 1px solid var(--lwc-colorBorderSeparatorAlt,rgb(221, 219, 218));
  margin-bottom: var(--lwc-spacingMedium,1rem);
  padding-bottom: var(--lwc-spacingSmall,0.75rem);
}

.forcePageError.desktop .genericNotification {
  font-weight: var(--lwc-fontWeightLight,300);
  border-radius: var(--lwc-borderRadiusMedium,0.25rem);
}

.forcePageError .genericNotification {
  background: var(--lwc-colorBackgroundToastError,rgb(194, 57, 52));
  padding: var(--lwc-spacingMedium,1rem);
  color: var(--lwc-colorTextModal,rgb(255, 255, 255));
  line-height: var(--lwc-lineHeightHeading,1.25);
}

.forcePageError .errorsList {
  list-style: none;
  color: var(--lwc-colorTextError,rgb(194, 57, 52));
  line-height: var(--lwc-lineHeightText,1.5);
  margin: 0;
  padding: var(--lwc-spacingXSmall,0.5rem) var(--lwc-spacingMedium,1rem) var(--lwc-spacingXxSmall,0.25rem) var(--lwc-spacingMedium,1rem);
}

lwc代码如下：

<template>
  <lightning-record-edit-form record-id={recordId} object-api-name="Opportunity"
  onsubmit={handleSubmit}>
      <lightning-messages></lightning-messages>
      <c-error-message-modal is-show-error-div={isShowErrorDiv}
      error-message-list={errorMessageList}>
      </c-error-message-modal>
      <lightning-layout multiple-rows="true">
          <lightning-layout-item size="6">
              <lightning-input-field field-name="Name"></lightning-input-field>
          </lightning-layout-item>
          <lightning-layout-item size="6">
              <lightning-input-field field-name="OrderNumber__c"></lightning-input-field>
          </lightning-layout-item>
          <lightning-layout-item size="12">
              <div class="slds-m-top_medium">
                  <lightning-button class="slds-m-top_small" label="Cancel"
                  onclick={handleReset}></lightning-button>
                  <lightning-button class="slds-m-top_small" type="submit"
                  label="Save Record"  onclick={handleClick}></lightning-button>
              </div>
          </lightning-layout-item>
      </lightning-layout>
  </lightning-record-edit-form>
</template>

import { LightningElement,track,api,wire } from 'lwc';
import { updateRecord,getRecord } from 'lightning/uiRecordApi';
import { ShowToastEvent } from 'lightning/platformShowToastEvent';
import { NavigationMixin } from 'lightning/navigation';
import OPPORTUNITY_ID_FIELD from '@salesforce/schema/Opportunity.Id';
import OPPORTUNITY_NAME_FIELD from '@salesforce/schema/Opportunity.Name';
import OPPORTUNITY_ORDER_NUMBER_FIELD from '@salesforce/schema/Opportunity.OrderNumber__c';
const fields = [
    OPPORTUNITY_ID_FIELD,
    OPPORTUNITY_NAME_FIELD,
    OPPORTUNITY_ORDER_NUMBER_FIELD
];
export default class OpportunityDetailEditWithEditForm extends NavigationMixin(LightningElement) {

    @api recordId = '0066g00000GQ4GyAAL';
    @track isShowErrorDiv = false;
    @track errorMessageList = [];

    @track isFormValid = true;

    handleSubmit(event) {
        event.preventDefault();
        if(!this.isShowErrorDiv) {
            const fields = {};
            fields[OPPORTUNITY_ID_FIELD.fieldApiName] = this.recordId;
            fields[OPPORTUNITY_NAME_FIELD.fieldApiName] = event.detail.Name;
            fields[OPPORTUNITY_ORDER_NUMBER_FIELD.fieldApiName] = event.detail.OrderNumber__c;
            const recordInput = { fields };
            this.errorMessageList = [];
            this.isShowErrorDiv = false;
            updateRecord(recordInput)
            .then(() => {
                this.dispatchEvent(
                    new ShowToastEvent({
                        title: 'Success',
                        message: 'Opportunity updated',
                        variant: 'success'
                    })
                );
            }).catch(error => {
                //
            });
        }
    }

    handleClick(event) {
        let allInputList = Array.from(this.template.querySelectorAll('lightning-input-field'));
        let invalidFieldLabel = [];
        const allValid = allInputList.forEach(field => {
            if(field.required && field.value === '') {
                invalidFieldLabel.push(field.fieldName);
                this.isShowErrorDiv = true;
            }
        });

        if(this.isShowErrorDiv) {
            this.errorMessageList.push('These required fields must be completed: ' + invalidFieldLabel.join(','));
        }
    }
    handleReset(event) {
        const inputFields = this.template.querySelectorAll(
            'lightning-input-field'
        );
        if (inputFields) {
            inputFields.forEach(field => {
                field.reset();
            });
        }
    }
}