property-binding | 易学教程

SafeValue must use [property]=binding although I'm already using property binding

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问题 I have following HTML with a property binding: <div [innerHtml]="logOutput"></div> In my component I add now some content with this line of code this.logOutput = this.sanitizer.bypassSecurityTrustHtml( this.logOutput + otpStr ); But nevertheless I get this error "SafeValue must use [property]=binding". Why I get this error? I'm already using property binding! I'm using Angular 5. Edit: I tried out using a custom pipe inside the HTML and it worked fine, but I want a solution without pipes.

JavaFX: check whether a text property is blank (and not just empty)

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问题 I want to have a button enabled or disabled based on whether a text field contains anything, and I want to implement this by using property binding. So at first I used the isEmpty() method on the text field's text property to create a boolean binding for the button's disabled property: startSearchButton.disableProperty().bind(searchField.textProperty().isEmpty()); While the binding works, my definition of "text field contains anything" is different to what the isEmpty() method does, namely

Angular [disabled]=“MyBoolean” not working

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问题 I have some inputs (Checkboxes) and I want them to be disabled if my Booleans are true. But its not working... The funny thing is the submit button works just fine and thats the same method... myComponent.html <form [formGroup]="BetreuungsoptionForm" (ngSubmit)="onSubmit()"> <label *ngIf="!eingetragen" for="art">Art</label> <select *ngIf="!eingetragen" formControlName="art" id="art" class="form-control" [(ngModel)]="Art" required > <option value="festeAnmeldung">feste Anmeldung</option>

Property binding map click event with dropdown select input in ngx-leaflet/Angular 2

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问题 I have a map with regional polygons. Below the map, I have a dropdown select input that dynamically reads in the polygon names as options. When the user clicks the regional polygons on the map, I want the dropdown select input to update with the selected polygon name (which exists as the 'name' field in the geojson file). I figure that the way to achieve this is to use property binding in the HTML template file. So in my select class, I set the value property as the value clicked , like so:

QML scope: property binding in child object failing

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问题 I'm new to QML and ran into a scope problem while going a button tutorial. I solved it but I don't understand why the code didn't work in the first place: Problem The following code gives Runtime reference errors when the button is hovered over: main_broken.qml import QtQuick 2.0 import QtQuick.Controls 1.1 ApplicationWindow { visible: true width: 640 height: 480 title: qsTr("Button Tester") Rectangle { id: simpleButton height: 75 width: 150 property color buttonColor: "light blue" property

Bidirectionally bind to property negation

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问题 Given DoubleProperty A; DoubleProperty minusA; is there a way to bind their negations bidirectionally to each other, so that A.get() == -minusA.get() at all times, and both can be set() ? 回答1: I tried but did´t find a way by using a bidirectional binding but maybe you could use an InvalidationListner on both? Something like A.addListener((Observable observable) -> { System.out.println("A is invalid"); minusA.set(A.get() *-1); }); minusA.addListener((Observable observable) -> { System.out

Can't bind to 'pickerType' since it isn't a known property of 'owl-date-time'

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问题 owl-date-time pickerType property is not not working with Angular 4. <owl-date-time [pickerType]="'timer'" [(ngModel)]="selectedStartDate" [min]="minDate"> Can't bind to 'pickerType' since it isn't a known property of 'owl-date-time'. npm: ng-pick-datetime-highlight Unable to import modules OwlDateTimeModule 回答1: You have to add OwlDateTimeModule and OwlNativeDateTimeModule to your @NgModule like this: import { NgModule } from '@angular/core'; import { BrowserModule } from '@angular/platform

Angular 2: Difference between property binding with and without brackets?

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问题 I noticed it's possible to property bind stuff without brackets. What is the difference? Typescript: import { Component, Input } from '@angular/core'; @Component( { selector: 'my-comp', templateUrl: ` input is {{foo}} ` }) export class myComponent { @Input() public foo: string; constructor() { } } HTML: Case 1 <my-comp [foo]="bar"></my-comp> Case 2 <my-comp foo="bar"></my-comp> 回答1: There are some Cases where we need to add like this html attributes dynamically might be and example which

JavaFX: check whether a text property is blank (and not just empty)

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I want to have a button enabled or disabled based on whether a text field contains anything, and I want to implement this by using property binding. So at first I used the isEmpty() method on the text field's text property to create a boolean binding for the button's disabled property: startSearchButton.disableProperty().bind(searchField.textProperty().isEmpty()); While the binding works, my definition of "text field contains anything" is different to what the isEmpty() method does, namely just checking if the text's length is > 0. However, I'm interested in whether there is "real" text, i.e.