在输入字段中取回取消时的旧值 [英] Get back old value on cancel for input-field
问题描述
对于输入字段,我有一个非常简单的双向数据绑定,并且希望让输入字段绑定的值返回到单击取消按钮时的状态。
I have a rather simple two-way data-binding for an input field and would like to have the value the input field binds to return to what it previously was when a "cancel" button is clicked.
代码当前如下所示:
html:
<div *ngIf="editModeToggle" class="five wide column left floated">
<div class="edit-on">
<input type="text" class="header" [(ngModel)]="item.name">
</div>
</div>
<div *ngIf="!editModeToggle" class="five wide column left floated">
<div class="header">{{item.name}}</div>
</div>
<div *ngIf="editModeToggle" class="one wide column">
<a (click)="saveChanges(item)"><i class="save icon"></i></a>
</div>
<div *ngIf="editModeToggle" class="one wide column">
<a (click)="cancelEdit()"><i class="cancel icon"></i></a>
</div>
<div *ngIf="!editModeToggle" class="one wide column">
<a (click)="edit(item)"><i class="edit icon"></i></a>
</div>
ts:
edit(item: any) {
this.editModeToggle = true;
this.oldItemData = this.item;
console.log('------ edit activate -------')
console.log('old item:', this.oldItemData.name);
console.log('item:', this.item.name);
}
saveSbuChanges(item: any) {
// some stuff happens
this.editModeToggle = false;
console.log('------ save -------')
console.log('old item:', this.oldItemData.name);
console.log('item:', this.item.name);
}
cancelEdit() {
this.editModeToggle = false;
this.item = this.oldItemData;
console.log('------ cancel -------')
console.log('old item:', this.oldItemData.name);
console.log('item:', this.item.name);
}
我期望的是使用 ABC初始化的item.name单击cancle时返回ABC。而是使用this.oldItemData.name作为新值。
What I would expect is that item.name, initialized with "ABC" would return to ABC when I click cancle. Instead, this.oldItemData.name takes on the new value.
控制台日志:
------ edit activate -------
old item: ABC
item: ABC
------ cancel -------
old item: ABCD
item: ABCD
什么我丢失了/如何取消将值恢复为激活编辑模式时的值?
what am I missing/how can I hav cancel return the value to what it as when edit-mode was activated?
推荐答案
this.oldItemData
是对 this.item
的引用。它将始终包含更新的值。您需要做的就是复制对象。下面是一个示例:
this.oldItemData
is a reference to this.item
. It will always contain the updated value. What you need to do is to copy the object. Here is an example:
this.oldItemData = JSON.parse(JSON.stringify(this.item));
this.oldItemData = JSON.parse(JSON.stringify(this.item));
这篇关于在输入字段中取回取消时的旧值的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!