Angular2 *ngFor把数据显示在多个input中出错解决方法

点击添加按钮会自动添加一个空的input组

html

<div class="form-inline">
            <label class="form-control-label">属性</label>
            <button type="button" class="btn btn-test" (click)="addProperty()">添加</button>
        </div>
        <div class="properties" *ngIf="options.properties">
            <div class="property-inline" *ngFor="let property of options.properties; let idx=index">
                <div class="form-inline" >
                    <label class="form-control-label"></label>
                    <div class="input-group">
                        <div class="form-inline">
                            <input type="text" class="property-input" name="proName_field" [(ngModel)]="property.name">
                            <input type="{{property.secret ? 'password' : 'text'}}" class="property-input" name="proValue_field" [(ngModel)]="property.value" >
                            <input type="checkbox" [(ngModel)]="property.secret" name="secret_field">
                            <a (click)="deleteProperty(idx)"><i class="fa fa-trash color-red"></i></a>
                        </div>
                    </div>
                </div>
            </div>
        </div>

js

addProperty() {
        const tempProperty = {
            name: '',
            value: ''
        };
        if (!this.options.properties) {
            this.options.properties = [];
        }
        this.options.properties.push(tempProperty);
 }

    deleteProperty(index) {
        this.options.properties.splice(index, 1);
    }

出现的问题是,当我在第一行input中分别添加上数据xxx,ddd后,再次点击添加按钮,此时页面刷新,添加一个空的input行,此时有两行,而第一行input中填好的值却不见了,查看元素它的model属性明明又是绑定了刚输入的值的,页面上怎么没有显示呢?

通过查阅资料了解到在ng2表单中使用ngModel需要注意,必须带有name属性或者使用 [ngModelOptions]=”{standalone: true}”,二选其一,再看我的html代码中我把显示name的input的name属性设置为一个定值,这样再经过*ngFor后,显示不同name值的input的name属性都是一样的,是不是这个原因导致的呢,于是就试着把每个input的name属性设为不一样的值:

<div class="form-inline">
            <label class="form-control-label">属性</label>
            <button type="button" class="btn btn-test" (click)="addProperty()">添加</button>
        </div>
        <div class="properties" *ngIf="options.properties">
            <div class="property-inline" *ngFor="let property of options.properties; let idx=index">
                <div class="form-inline" >
                    <label class="form-control-label"></label>
                    <div class="input-group">
                        <div class="form-inline">
                            <input type="text" class="property-input" [name]="'proName_field' + idx" [value]="property.name" [(ngModel)]="property.name">
                            <input type="{{property.secret ? 'password' : 'text'}}" class="property-input" [name]="'proValue_field'+idx" [(ngModel)]="property.value" >
                            <input type="checkbox" [(ngModel)]="property.secret" [name]="'secret_field'+idx">
                            <a (click)="deleteProperty(idx)"><i class="fa fa-trash color-red"></i></a>
                        </div>
                    </div>
                </div>
            </div>
        </div>

问题解决了。。。。

原文地址:https://www.cnblogs.com/xuepei/p/7808779.html