我正在创建一个允许用户添加类别并重新排序的应用程序。当按下“添加类别”时,它将在表中创建一个新行,并显示一个输入表单,以允许用户命名该类别。但是,如果输入中包含* ngIf,则无法将表单数据发送到“保存”按钮。我什至尝试将if语句放在围绕输入的div上,但无济于事。我只是得到输入未定义。
categories.component.html
files
categories.component.ts
<div class="container table-responsive">
<table class="table table-striped table-hover">
<thead>
<p class="ml-3 mt-2 mb-0 float-left">Section</p>
<a href="#" class="add-category mt-3 mr-3" (click)="addCatagory()">+ ADD CATEGORY</a>
<tr>
<th scope="col"></th>
<th scope="col">CATEGORY</th>
<th scope="col" class="mt-3">SEQ.</th>
<th scope="col"></th>
</tr>
</thead>
<tbody dragula="categories" [(dragulaModel)]="sortableList" id="tbody">
<tr *ngFor="let row of sortableList; index as i;">
<th scope="row" class="sort-cell">
<button class="btn bg-transparent">
<img src="/assets/images/sortable.svg" alt="">
</button>
</th>
<td>
<p *ngIf="!row.editing">
{{row.title}}
</p>
<input #box placeholder="Category Name">
</td>
<td>
<p class="seq text-white text-center">{{i + 1}}</p>
</td>
<td class="text-right">
<button class="btn bg-transparent border-0" (click)="delCatagory(row.title)">
<img *ngIf="!row.editing" src="/assets/images/delete.svg" alt="">
</button>
<a *ngIf="row.editing" href="#" class="add-category mt-3 mr-3" (click)="senddata(box.value, i)">Save</a>
</td>
</tr>
</tbody>
</table>
</div>
错误
import { Component, OnInit } from '@angular/core';
@Component({
selector: 'app-categories',
templateUrl: './categories.component.html',
styleUrls: ['./categories.component.scss']
})
export class CategoriesComponent implements OnInit {
sortableList = [];
senddata(value, i): void {
var a = value;
var current = this.sortableList.length;
console.log('Value ' + a);
console.log('Current ' + current);
this.sortableList.splice(i, 1, {
id: current,
title: a,
editing: false
});
}
addCatagory(): void {
var current = this.sortableList.length;
this.sortableList.push({
id: current + 1,
title: 'Catagory ' + (current + 1),
editing: true
});
}
delCatagory(a): void {
var pos = this.sortableList
.map(function(e) {
return e.title;
})
.indexOf(a);
this.sortableList.splice(pos, 1);
}
spliceCategory(a): void {
var value = a;
var current = this.sortableList.length;
console.log('Value ' + value);
console.log('Current ' + current);
}
editCategory(a): void {
var value = a;
var current = this.sortableList.length;
this.sortableList.push({
id: current + 1,
title: 'Catagory ' + (current + 1),
editing: false
});
}
constructor() {}
ngOnInit() {}
ngAfterViewInit() {}
}
答案 0 :(得分:0)
我遇到了这个问题,如果我没记错的话:问题是当发送带有输入的数据时,它们需要具有唯一的ID,以便在不同操作期间彼此区分开。
由于输入是使用* ngFor创建的,因此可以在ID属性中添加通用名称,并附加* ngFor的索引值:
<tbody dragula="categories" [(dragulaModel)]="sortableList" id="tbody">
<tr *ngFor="let row of sortableList; index as i;">
<th scope="row" class="sort-cell">
<button class="btn bg-transparent">
<img src="/assets/images/sortable.svg" alt="">
</button>
</th>
<td>
<p *ngIf="!row.editing">
{{row.title}}
</p>
<input #box placeholder="Category Name" id="CategoryName{{i}}">
</td>
<!-- ... -->
</tr>
</tbody>
所有输入ID均以相同的字符开头,并在末尾具有唯一的数字,从而使它们唯一:
<input #box placeholder="Category Name" id="CategoryName0">
<input #box placeholder="Category Name" id="CategoryName1">
...
<input #box placeholder="Category Name" id="CategoryNameN">