PrimeNG

Question

我有一个 multiSelect 组件，我希望每当用户更改其选择的选项时显示确认消息，询问他们是否要继续进行该更改，并根据他们的回答回滚更改或应用它们.

遗憾的是，我没有找到任何内置功能来实现这一点，有什么方法可以在(onChange)事件期间应用上述功能吗？

示例：

<p-multiSelect [options]="availableLanguages" [(ngModel)]="languages" 
                               name="languages"
                               (onChange)="myChangeFunction($event);"
                               class="multiselect-custom">


myChangeFunction(event: any) {
  this.confirmationService.confirm({
    message: 'Are you sure?',
    acceptLabel: 'Yes',
    rejectLabel: 'No',
    accept: () => {
       // do that change if user presses "Yes"
    },
    reject: () => {
      // rollback the change if user presses "No"
    }
  });
 }

Angular版本：12.2.3

PrimeNG 版本：12.1

Answer 1

因此，正如评论部分所述，我最终通过在多选 change 事件发生之前保留值的副本来解决此问题，以便 如果用户在显示的确认对话框中授予权限，我们将保留更改，如果用户未授予权限，确认对话框，我们回滚更改 设置为上一个副本的实际值。

代码示例如下：

.html 文件

<p-multiSelect [options]="availableLanguages" [(ngModel)]="languages" name="languages" (onChange)="myChangeFunction($event);" class="multiselect-custom">

.ts 文件

languages = [....]; // this is our variable carrying the actual values languagesCopy = []; // this is our "copy-variable" helper for rollback ngOnInit(): void { // initialize the "languagesCopy" to have same value with "languages" this.languagesCopy = this.languages; } myChangeFunction(event: any) { this.confirmationService.confirm({ message: 'Are you sure?', acceptLabel: 'Yes', rejectLabel: 'No', accept: () => { // do nothing since the change has already take place }, reject: () => { // rollback the change if user presses "No" // "languages" have already changes since it is binded through // [ngModel] from the multiSelect change event, so set the languages // variable back to its previous value stored in "languagesCopy" this.languages = this.languagesCopy; } }); }

我不知道是否有更好的方法来实现上述场景，但这个解决方案很适合我的情况:)

PrimeNG - 用户确认的多选

PrimeNG - MultiSelect with user confirmation

multi-select

angular