我们如何在Typescript中动态隐藏或显示RadDataForm字段? [英] How we can hide or show RadDataForm fields dynamically in Typescript?
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问题描述
我正在使用Nativescript + angular应用程序并使用RadDataForm.这是我的示例代码.
I am working on Nativescript+angular application and using RadDataForm. Here is my example code.
<RadDataForm (propertyValidate)="onPropertyValidate($event)" row="0" tkExampleTitle tkToggleNavButton #myDataForm [source]="person"
[metadata]="personMetadata"></RadDataForm>
我正在使用"Json"文件创建表单.
I am creating the form with "Json" file.
{
"isReadOnly": false,
"commitMode": "Immediate",
"validationMode": "Immediate",
"propertyAnnotations": [
{
"name": "insurance_name",
"displayName": "Insurance Name",
"index": 0,
"validators": [
{
"name": "NonEmpty",
"params": {
"errorMessage": "Insurance Name cannot be empty."
}
},
{ "name": "MinimumLength", "params": { "length": 4 } }
]
},
{
"name": "name",
"displayName": "Name",
"index": 1,
"validators": [
{
"name": "NonEmpty",
"params": {
"errorMessage": "Name cannot be empty."
}
}
]
}
}
]
我只想知道我们如何在打字稿文件中动态显示/隐藏特定字段.假设我必须在选择下拉值时显示一些字段. 希望你们能理解我的关心.请让我知道是否有人知道.
I just want to know that how we can show/hide the particular field dynamically in typescript file. Suppose I have to show some field on the selection of drop down value. Hope you guys understand my concern. Please let me know if any one knows.
推荐答案
下面是一个快速示例,您可以根据自己的需要进行改进.
Here is a quick example which you could improve based on your needs.
HTML
<RadDataForm [source]="person" [metadata]="personMetadata"
(propertyValidated)="onPropertyValidated($event)"></RadDataForm>
TS
import { Component, ViewChild } from "@angular/core";
import { RadDataForm, DataFormEventData } from "nativescript-ui-dataform";
import { RadDataFormComponent } from "nativescript-ui-dataform/angular";
declare var android;
@Component({
selector: "Home",
moduleId: module.id,
templateUrl: "./home.component.html",
styleUrls: ["./home.component.css"]
})
export class HomeComponent {
person = {
insurance_name: "",
name: "",
location: ""
};
personMetadata = {
"isReadOnly": false,
"commitMode": "Immediate",
"validationMode": "Immediate",
"propertyAnnotations": [
{
"name": "insurance_name",
"displayName": "Insurance Name",
"index": 0,
"validators": [
{
"name": "NonEmpty",
"params": {
"errorMessage": "Insurance Name cannot be empty."
}
},
{ "name": "MinimumLength", "params": { "length": 4 } }
]
},
{
"name": "name",
"displayName": "Name",
"index": 1,
"validators": [
{
"name": "NonEmpty",
"params": {
"errorMessage": "Name cannot be empty."
}
}
]
},
{
"name": "location",
"displayName": "Location",
"index": 2
}
]
};
onPropertyValidated(event: DataFormEventData) {
if (event.propertyName === "insurance_name") {
const editor = (<RadDataForm>event.object).getPropertyByName("name").editor;
if (editor.android) {
// Using hidden on Android throws exception here, if you want to show / hide the control from a different place (not while validation), it might work.
editor.android.rootLayout().setVisibility(event.entityProperty.isValid ? android.view.View.VISIBLE : android.view.View.GONE);
} else {
(<RadDataForm>event.object).getPropertyByName("name").hidden = !event.entityProperty.isValid;
}
}
}
}
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