问题描述
我需要循环浏览一个扩展的叠加控件。覆盖层展开后,我想循环浏览输入元素,直到覆盖层折叠为止。我已经将代码工作到了一定程度,即,当覆盖层可见时,我的焦点便设置为第一个输入元素,并循环到最后一个“按钮”元素。
我的问题是,我添加的代码无法循环显示扩展的叠加层,因此无法正常工作。
@ViewChild('focusShortCode',{ static: true }) nameField: ElementRef;
public setFocus(isSet: boolean) {
if (isSet) {
this.nameField.nativeElement.focus();
}
}
public onBlur(isSet: boolean) {
if (isSet) {
this.nameField.nativeElement.focus();
}
}
问题是,当调用“ onBlur”时,我的焦点跳到了扩展叠加层中的第二个输入元素上
onblur将焦点设置为“ name”元素而不是“ shortCode”元素
<div class="container">
<div class="layout-Box" igxLayout igxLayoutJustify="end">
<div class="layout-Box__el" >
<igx-input-group type="border" style="width: 200px;">
<input igxInput #focusShortCode name="shortCode" type="text" [value]="shortCode" />
<label igxLabel for="shortCode">{{shortCodePlaceHolder}}</label>
</igx-input-group>
</div>
<div class="layout-Box__el">
<igx-input-group type="border" style="width: 200px;">
<input igxInput name="name" type="text" [value]="name" />
<label igxLabel for="name">{{namePlaceHolder}}</label>
</igx-input-group>
</div>
</div>
<div class="layout-Box" igxLayout igxLayoutJustify="end" style="margin-top: -15px;">
<div class="layout-Box__el">
<igx-input-group type="border" style="width: 200px;">
<input igxInput name="street1" type="text" [value]="street1" />
<label igxLabel for="street1">{{street1PlaceHolder}}</label>
</igx-input-group>
</div>
<div class="layout-Box__el">
<igx-input-group type="border" style="width: 200px;">
<input igxInput name="street2" type="text" [value]="street2"/>
<label igxLabel for="street2">{{street2PlaceHolder}}</label>
</igx-input-group>
</div>
</div>
<div class="layout-Box" igxLayout igxLayoutJustify="end" style="margin-top: -15px;">
<div class="layout-Box__el">
<igx-input-group type="border" style="width: 200px;">
<input igxInput name="city" type="text" [value]="city"/>
<label igxLabel for="city">{{cityPlaceHolder}}</label>
</igx-input-group>
</div>
<div class="layout-Box__el">
<igx-input-group type="border" style="width: 200px;">
<input igxInput name="country" type="text" [value]="county"/>
<label igxLabel for="country">{{countyPlaceHolder}}</label>
</igx-input-group>
</div>
</div>
<div class="layout-Box" igxLayout igxLayoutJustify="end" style="margin-top: -15px;">
<div class="layout-Box__el">
<igx-input-group type="border" style="width: 200px;">
<input igxInput name="postCode" type="text" [value]="postCode"/>
<label igxLabel for="postCode">{{postCodePlaceHolder}}</label>
</igx-input-group>
</div>
<div class="layout-Box__el">
<igx-input-group type="border" style="float: right; width: 100px;" >
<input igxInput name="country" type="text" [value]="country" />
<label igxLabel for="country">{{countryCodePlaceHolder}}</label>
</igx-input-group>
</div>
<div>
<button class="igx-button--raised" #buttonElement igxButton (keydown.Tab)="onBlur(true)">Close</button>
</div>
</div>
</div>
解决方法
当覆盖应用于按键,按钮单击等的逻辑时,需要确保防止默认行为。由于keydown是可取消的事件,因此您可以将event参数传递给处理程序,并使用event.preventDefault()取消它。在此之前,可以调用event.stopPropagation()方法以防止事件冒泡:
df$y <- ""
df$y[df$x == 2] <- "hello"
df$y[df$x == 3] <- "world"
此处提供了一个使用igxInputGroup和IgxOverlayService来说明我的建议的小样本:https://stackblitz.com/edit/cycle-through-elems-in-overlay