在 TypeScript 中获取“HTMLInputElement”类型
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Get a "HTMLInputElement" type in TypeScript
提问by codelegant
There is a <input type="checkbox" id="mainCheckbox" />,I want to use the property checkedof it.And the vscode waring Property 'checked' does not exist on type 'HTMLElement'.I know that must be type HTMLInputElement,But I can't change it,the method getElementById()is return the type HTMLElement;
有一个<input type="checkbox" id="mainCheckbox" />，我想使用它的属性checked。还有vscode警告Property 'checked' does not exist on type 'HTMLElement'。我知道必须是类型HTMLInputElement，但我不能改变它，方法getElementById()是返回类型HTMLElement；
var controlCheckbox= document.getElementById("mainCheckbox"),
addBtn = document.getElementById("btn_add"),
container = document.getElementById("observers");
ObserverSubject.extend(new ObserverSubject.Subject(), controlCheckbox);
controlCheckbox.onclick=()=>{
this.Notify(controlCheckbox.checked);
}
回答by Shikloshi
Try this simple cast:
试试这个简单的演员表：
var controlCheckbox = <HTMLInputElement>document.getElementById("mainCheckbox")
