再次为那些看过我关于这种瓶装形式的帖子的人再次致敬……又回来了。
在我开始解释任何内容之前,这是一个工作的plunkr,显示了该问题:
注意:我typeId
在第二个数组中显示Bottle ,它清楚地显示了问题。
问题 :
当我遇到以下情况的问题时,我正在检查绑定以确保正确选择了我选择的值:
Order
,Return order
以便您有多个输入。有没有办法避免使用标准这种奇怪的行为Template Driven Forms
?还是我必须经历ReactiveForms
?
我将在这里解释我的大部分代码:
我正在向寄送一排bottleArray
装有气瓶name
和气瓶的数组,typeId
格式为@Input()
。
我将这个数组及其对象深深克隆到两个单独的数组中:orderedClonedArrayBottles
和returnedClonedArrayBottles
。
然后,我将值添加到相应的显示数组中:orderedBottles
并且returnedBottles
现在具有一个count
值。
...
@Input() private bottleArray: Bottle[];
private orderedClonedArrayBottles: Bottle[] = [];
private returnedClonedArrayBottles: Bottle[] = [];
private orderedBottles: BottleCommand[] = [];
private returnedBottles: BottleCommand[] = [];
ngOnChanges(changes) {
// Get @Input data when it's ready
if (changes.bottleArray) {
// Cloning the Array AND the Bottles
this.orderedClonedArrayBottles = this.deepClone(changes.bottleArray.currentValue);
this.returnedClonedArrayBottles = this.deepClone(changes.bottleArray.currentValue);
// Display first rows
if (this.orderedClonedArrayBottles.length > 0) {
this.orderedBottles.push(this.orderedClonedArrayBottles[0]);
}
if (this.returnedClonedArrayBottles.length > 0) {
this.returnedBottles.push(this.returnedClonedArrayBottles[0]);
}
}
}
我可以使用以下方法删除任何数组的任何索引:
removeRow(index: number, type: string, event: Event): void {
event.stopPropagation();
if (type == 'order') {
// Cleans the reference 'count' value.
this.orderedBottles[index].count = null;
this.orderedBottles.splice(index, 1);
} else {
this.returnedBottles[index].count = null;
this.returnedBottles.splice(index, 1);
}
}
我可以使用2个单独的按钮将这些项目推入这2个数组的任何一个中:AddOrder()
和AddReturnOrder()
(相同代码):
addOrder(event: Event): void {
event.stopPropagation();
// Limits to the number of types
if (this.orderedBottles.length < this.orderedClonedArrayBottles.length) {
let index = this.getAvailableIndex(this.orderedBottles, this.orderedClonedArrayBottles);
this.orderedBottles.push(this.orderedClonedArrayBottles[index]);
}
}
为了避免在数组中推送现有的引用,我使用以下方法,该方法将为我提供第一个尚未显示的可用索引:
/**
* Gets the first available index from 2 arrays containing the same references.
*
* @param {Object[]} displayedArray Array containing the occupied indexes
* @param {Object[]} referenceArray Array containing all the indexes
* @return {number} Index of the first available position
*/
getAvailableIndex(displayedArray: Object[], referenceArray: Object[]): number {
let index: number = null;
// Gets the available indexes of Bottles by filtering the referenceArray with the displayedArray
let availablePositions: Object[] = referenceArray.filter(element => displayedArray.indexOf(element) < 0);
// Return the first position available
return index = referenceArray.indexOf(availablePositions[0]);
}
这是相应的HTML :(在Plunkr中更加清晰)
<div fxLayout="row" style="max-width: 80%">
<div fxLayout="column" style="min-width: 50%">
<div fxLayout="row" style="max-width: 100%" *ngFor="let bottle of orderedBottles; let i = index">
<md-select class="select" placeholder="Select bottle type" name="orderedTypeSelect_{{i}}" [(ngModel)]="orderedBottles[i].typeId">
<md-option class="options" *ngFor="let type of bottleArray" [value]="type.typeId">
{{ type.name }}
</md-option>
</md-select>
<md-input-container class="container">
<input md-input type="number" name="orderedBottleInput_{{i}}" autocomplete="off" [(ngModel)]="orderedBottles[i].count"
step="1" min="0" max="99">
</md-input-container>
<button class="button-row" type="button" (click)="removeRow(i, 'order', $event)">-</button>
{{orderedBottles[i].typeId}} -
{{orderedBottles[i].count}}
</div>
</div>
<div fxLayout="column" style="min-width: 50%">
<div fxLayout="row" style="max-width: 100%" *ngFor="let bottle of returnedBottles; let j = index">
<md-select class="select" placeholder="Select bottle type" name="returnedTypeSelect_{{j}}" [(ngModel)]="returnedBottles[j].typeId">
<md-option class="options" *ngFor="let type of bottleArray; let z = index" [value]="bottleArray[z].typeId">
{{ bottleArray[z].typeId }}
</md-option>
</md-select>
<md-input-container class="container">
<input md-input type="number" name="returnedBottleInput_{{j}}" autocomplete="off" [(ngModel)]="returnedBottles[j].count"
step="1" min="0" max="99">
</md-input-container>
<button style="margin-top: -20px;" class="button-row" type="button" (click)="removeRow(j, 'return', $event)">-</button>
{{returnedBottles[j].typeId}} -
{{returnedBottles[j].count}}
</div>
</div>
</div>
<div class="margin">
<button md-raised-button type="button" class="submit-button" (click)="addOrder($event)">Add Order</button>
<button md-raised-button type="button" class="submit-button" (click)="addReturnOrder($event)">Add Return Order</button>
</div>
使用trackBy
以避免混乱:
*ngFor="let bottle of orderedBottles; let i = index; trackBy: trackByFn"
trackByFn(index) {
return index;
}
它还可以提高您的表现
也可以看看
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