Angular 6跟进:选项值中的[attr.disabled]禁用所有条目 [英] Angular 6 Follow up: [attr.disabled] in option value disables all entries
问题描述
主题:Angular 6,反应形式,下拉菜单,禁用一个选项: 即使检查员说disabled = false,也将禁用所有功能而不只是一个预期值.
Topic: Angular 6, Reactive Form, DropDown Menu, Disable One Option: all instead of just the one intended value are disabled, even though the inspector says disabled=false.
People were very kind to help me with my problem earlier: "Angular 6 Reactive Form - Select options: disable previously selected options" but they seemed to disappear after I hit a roadblock, hence my new question:
为什么禁用所有选项值,而不是仅禁用应该与该语句匹配的值? [attr.disabled]="uplink2x === dropdown1Val"
(即使我对nic0
而不是dropdown1Val
进行硬编码,所有选项也都被禁用)
Why are ALL option values disabled instead of just the one that is supposed to match the statement? [attr.disabled]="uplink2x === dropdown1Val"
(even if I hardcode nic0
instead of dropdown1Val
all options are disabled)
component.ts:
component.ts:
nicAdapters: any[] = ['nic0','nic1','nic2','nic3','nic4','nic5','nic6','nic7','nic8','nic9','nic10']
this.inputForm = this.fb.group({
upLinks: this.fb.group ({
NumberUplinks: ['2'],
uplinksMgmt: this.fb.group ({
uplink1: ['nic0'],
uplink2: ['nic1'],
uplink3: ['nic3'],
})
})
})
public changedVal(val) {
this.dropdown1Val = val;
}
component.html:
component.html:
<div class="select" formGroupName="uplinksMgmt">
<select formControlName="uplink1" id="uplink1Id" class="selectBox" (change)="changedVal($event.target.value)">
<option *ngFor="let uplink1x of nicAdapters" [ngValue]="uplink1x">{{uplink1x}}</option>
</select>
</div>
<div class="select" formGroupName="uplinksMgmt">
<select formControlName="uplink2" id="uplink2Id" class="selectBox" (change)="changedVal($event.target.value)">
<option *ngFor="let uplink2x of nicAdapters" [attr.disabled]="uplink2x === dropdown1Val" [ngValue]="uplink2x">{{uplink2x}}</option>
</select>
</div>
Stackblitz: https://stackblitz.com/edit/clarity-light-theme- v012-irvrup
Stackblitz:https://stackblitz.com/edit/clarity-light-theme-v012-irvrup
类似于disabled="true"
(或disabled="false"
)似乎不适用于选项值.
Seems like disabled="true"
(or disabled="false"
for that matter) doesn't work with option values.
推荐答案
要禁用元素,只需使用属性disabled
而不是true或false.要再次启用它,您需要删除disabled
属性.在您的代码[attr.disabled]
中将值设置为true或false,您只需要使用[disabled]
而不是[attr.disabled]
.
To disable elements just use attribute disabled
rather than true or false. To enable it again, you need to remove the disabled
attribute. In your code [attr.disabled]
is setting the value to true or false, what you need is just use [disabled]
instead of [attr.disabled]
.
<option>Test FALSE</option>
<option disabled>Test TRUE</option>
<option *ngFor="let dropDownTestx of adapters"
[ngValue]="dropDownTestx"
[disabled]="dropDownTestx === 'vmnic2'">
{{dropDownTestx}}
</option>
Updated your stackblitz here.
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