当我使用 Angular Material 和一些自定义它的代码时，如何解决 Angular 应用程序中的 $event 问题

Question

我在使用 Angular Material 的 Angular 6 版本中发现了一个问题。任何人都可以帮助我修复 $event 的这个错误。

 ERROR Error: Cannot assign value "$event" to template variable "nameValue". Template variables are read-only.
at _AstToIrVisitor.push../node_modules/@angular/compiler/fesm5/compiler.js._AstToIrVisitor.visitPropertyWrite (compiler.js:8719)
at PropertyWrite.push../node_modules/@angular/compiler/fesm5/compiler.js.PropertyWrite.visit (compiler.js:7589)
at convertActionBinding (compiler.js:8320)
at prepareEventListenerParameters (compiler.js:17473)
at Object.params (compiler.js:18598)
at compiler.js:18369
at Array.map (<anonymous>)
at compiler.js:18369
at compiler.js:17630
at Array.map (<anonymous>)

我没有使用任何模板变量。我直接把它放在Html中。

Unhandled Promise rejection: Cannot assign value "$event" to template variable "nameValue". Template variables are read-only. ; Zone: <root> ; Task: Promise.then ; Value: Error: Cannot assign value "$event" to template variable "nameValue". Template variables are read-only.
    at _AstToIrVisitor.push../node_modules/@angular/compiler/fesm5/compiler.js._AstToIrVisitor.visitPropertyWrite (compiler.js:8719)
    at PropertyWrite.push../node_modules/@angular/compiler/fesm5/compiler.js.PropertyWrite.visit (compiler.js:7589)
    at convertActionBinding (compiler.js:8320)
    at prepareEventListenerParameters (compiler.js:17473)
    at Object.params (compiler.js:18598)
    at compiler.js:18369
    at Array.map (<anonymous>)
    at compiler.js:18369
    at compiler.js:17630
    at Array.map (<anonymous>) Error: Cannot assign value "$event" to template variable "nameValue". Template variables are read-only.
    at _AstToIrVisitor.push../node_modules/@angular/compiler/fesm5/compiler.js._AstToIrVisitor.visitPropertyWrite (http://localhost:4200/vendor.js:39190:27)
    at PropertyWrite.push../node_modules/@angular/compiler/fesm5/compiler.js.PropertyWrite.visit (http://localhost:4200/vendor.js:38060:24)
    at convertActionBinding (http://localhost:4200/vendor.js:38791:45)
    at prepareEventListenerParameters (http://localhost:4200/vendor.js:47944:23)
    at Object.params (http://localhost:4200/vendor.js:49069:20)
    at http://localhost:4200/vendor.js:48840:90
    at Array.map (<anonymous>)
    at http://localhost:4200/vendor.js:48840:56
    at http://localhost:4200/vendor.js:48101:83
    at Array.map (<anonymous>)

对此的任何解决方案

Answer 1

我在 Angular 9 上遇到了同样的问题。我发现我已经声明了一个变量，就像"let nameValue of values"我[(item)]=nameValue在模板上所做的那样。问题是我分配item给nameValue了双重绑定。删除()解决了我的问题