Question

如何在Angular模板中使用 $ any（）类型转换函数？

在角度文档中- https://angular.io/guide/template-syntax#the-any-type-cast-function 给出了一些描述和示例，但还不清楚。

有一个这样的例子-

<p>The item's undeclared best by date is: {{$any(item).bestByDate}}</p>

Answer 1

只需用$any()包装一个变量。不需要其他代码。

component.ts

export class AppComponent {
  val = { name: 'foobar' }
}

component.html

<p>
  {{ $any(val).name }}
</p>

stackblitz：https://stackblitz.com/edit/angular-qivjym

Answer 2

接受的答案给出的例子没有显示CREATE OR REPLACE FUNCTION Get_Warnings RETURN SYS_REFCURSOR IS v_recordset SYS_REFCURSOR; JsonArray VARCHAR2(32767); arrWarnings VARCHAR2(1000); v_sql VARCHAR2(32767); v_keys VARCHAR2(32767); v_cols VARCHAR2(32767); BEGIN JsonArray :='[ { "partialSuccessWarning": { "VS-548986": [ "aaa" ], "VS-548984": [ "bbb" ], "VS-548982": [ "ccc" ] } } ]'; arrWarnings := JSON_QUERY(JsonArray, '$'); WITH t(JA) AS ( SELECT JSON_QUERY(JsonArray, '$[*]."partialSuccessWarning"') FROM dual ), t2 AS ( SELECT REGEXP_REPLACE( REGEXP_SUBSTR( JA , '[^[]+',1,level ), '(.*")(\S+)(":.*)', '\2') AS keys, level AS lvl FROM t CONNECT BY level <= REGEXP_COUNT( JA, '\["' ) ) SELECT LISTAGG( '"'||keys||'"',',') WITHIN GROUP (ORDER BY lvl), LISTAGG( '"'||keys||'" VARCHAR2(1000) PATH ''$."'||keys||'"[*]''',',') WITHIN GROUP (ORDER BY lvl) INTO v_keys, v_cols FROM t2; v_sql := 'SELECT '||v_keys|| ' FROM dual CROSS JOIN JSON_TABLE(:Warnings, ''$'' COLUMNS(NESTED PATH ''$[*]."partialSuccessWarning"'' COLUMNS('||v_cols||') ) )'; OPEN v_recordset FOR v_sql USING arrWarnings; RETURN v_recordset; END; /背后的真正原因

$any

*ts

<p> {{obj.prop1}}</p>
<!--
This will throw an error without $any() because newProp is not part of typeof obj.  
<p> {{obj.newProp}}</p>
-->
<p> {{$any(obj).newProp}}</p>

https://stackblitz.com/edit/angular-ivy-aofufm?file=src%2Fapp%2Fapp.component.html

角度模板中的$ any（）类型转换函数

2 个答案: