{"id":956,"date":"2018-11-24T23:50:38","date_gmt":"2018-11-24T15:50:38","guid":{"rendered":"https:\/\/www.develop-note.com\/blog\/?p=956"},"modified":"2022-02-17T15:38:36","modified_gmt":"2022-02-17T07:38:36","slug":"angular-enum-dropdownlist","status":"publish","type":"post","link":"https:\/\/www.develop-note.com\/blog\/2018\/11\/24\/angular-enum-dropdownlist\/","title":{"rendered":"Angular Enum \u8981\u5982\u4f55\u8f49\u63db\u70ba\u4e0b\u62c9\u9078\u55ae"},"content":{"rendered":"

Angular Enum Dropdownlist<\/h1>\n

\u4eca\u5929\u4f86\u8ac7\u8ac7 Angular \u958b\u767c\u7684\u4e00\u4e9b\u5927\u5c0f\u4e8b\uff0c\u76f8\u4fe1\u7a0b\u5f0f\u958b\u767c\u7684\u670b\u53cb\u5011\u5e38\u5e38\u6703\u7528\u5230 Enum <\/a> \u9019\u7a2e\u578b\u5225\uff0c\u4e2d\u6587\u7ffb\u8b6f\u70ba\u5217\u8209\uff0c\u7c21\u55ae\u8b1b\u5c31\u662f\u5217\u51fa\u96c6\u5408\u4e2d\u7269\u4ef6\u7684\u578b\u5225\uff0c\u4f8b\u5982\u661f\u671f\u7684\u5217\u8209\u503c\u70ba SUNDAY\u3001MONDAY\u3001TUESDAY\u3001WEDNESDAY\u3001THURSDAY\u3001FRIDAY\u3001SATURDAY \uff0c\u4f46\u662f\u5982\u4f55\u5c07\u5217\u8209\u8f49\u63db\u70ba\u4e0b\u62c9\u9078\u55ae\u5462\uff0c\u4eca\u5929\u5c31\u4f86\u8ddf\u5927\u5bb6\u8ac7\u8ac7\u9019\u554f\u984c\u3002<\/p>\n

<\/p>\n

\u524d\u5e7e\u65e5\u53c3\u52a0\u4e86 Angular Taiwan \u7684\u8ad6\u58c7\u8b93\u7b46\u8005\u53d7\u76ca\u826f\u591a\u7576\u4e0b\u7684\u7b46\u8a18\u653e\u5728 Angular Taiwan\u8ad6\u58c7\u7b46\u8a18<\/a> \uff0c\u7136\u5f8c\u60f3\u8d77\u7b46\u8005\u4e00\u5e74\u524d\u958b\u767c Angular \u6642\u9047\u5230\u4e00\u4e9b\u958b\u767c\u4e0a\u7684\u554f\u984c\uff0c\u60f3\u8aaa\u5169\u5e74\u5f8c\u4f86\u627e\u627e\u662f\u5426\u6709\u66f4\u5bb9\u6613\u89e3\u6c7a\u7684\u65b9\u6848\uff0c\u4eca\u5929\u5c31\u8ddf\u5927\u5bb6\u5206\u4eab\u4e00\u4e0b\u9019\u500b\u554f\u984c\u4ee5\u53ca\u89e3\u6c7a\u7576\u65b9\u6cd5\u3002<\/p>\n

\u5217\u8209<\/h1>\n

\u5728\u8aaa\u660e\u89e3\u6c7a\u65b9\u6cd5\u4e4b\u524d\u5148\u8ddf\u5927\u5bb6\u8aaa\u660e\u4e00\u4e0b\u554f\u984c\uff0c\u5728\u8aaa\u660e\u554f\u984c\u4e4b\u524d\u7576\u7136\u9700\u8981\u8ddf\u5927\u5bb6\u8aaa\u660e\u5217\u8209\u9019\u500b\u6771\u897f\uff0c\u5728 typescript<\/code> \u4e2d\u53ef\u4ee5\u5b9a\u7fa9enum\u95dc\u9375\u5b57\uff0c\u5b8c\u6574\u7684\u5167\u5bb9\u5982\u4e0b:<\/p>\n

enum Currency {\n    USD = 'US Dollar',\n    MYR = 'Malaysian Ringgit',\n    SGD = 'Singapore Dollar',\n    INR = 'Indian Rupee',\n    JPY = 'Japanese Yen'\n}<\/code><\/pre>\n
\u5217\u8209\u9019\u6771\u897f\u53ef\u4ee5\u5b9a\u7fa9\u661f\u671f\u3001\u5e63\u5225\u7b49\u7b49\u7684\u5167\u5bb9\uff0c\u4e26\u4e14\u53ef\u4ee5\u8b93\u4f7f\u7528\u8005\u9078\u53d6\u5217\u8209\u7a2e\u4e2d\u7684\u4e00\u6216\u662f\u591a\u500b\u9805\u76ee\uff0c\u5c31\u4ee5\u8981\u4f7f\u7528\u8005\u9078\u53d6\u4e00\u500b\u9805\u76ee\u800c\u8a00\u5b83\u662f\u975e\u5e38\u9069\u5408\u653e\u5728\u4e0b\u62c9\u9078\u55ae\u4e4b\u4e2d\uff0c\u7136\u800c\u5728\u6240\u6709\u6771\u897f\u90fd\u662f object<\/code> \u7684 javascript \u4e2d\u5217\u8209\u662f\u600e\u9ebc\u7522\u751f\u51fa\u4f86\u7684\uff0c\u5176\u5be6\u5c31\u662f\u5728\u7de8\u8b6ftypescript\u6642\u5c07\u5217\u8209\u8f49\u63db\u6210\u4ee5\u4e0b\u5167\u5bb9\uff1a<\/p>\n
var Currency;\n(function (Currency) {\n    Currency["USD"] = "US Dollar";\n    Currency["MYR"] = "Malaysian Ringgit";\n    Currency["SGD"] = "Singapore Dollar";\n    Currency["INR"] = "Indian Rupee";\n    Currency["JPY"] = "Japanese Yen";\n})(Currency = exports.Currency || (exports.Currency = {}));<\/code><\/pre>\n
\u9019\u908a\u8b80\u8005\u5011\u53ef\u4ee5\u8a66\u8a66 Typescript Playground<\/a> \u9019 typescript \u5b98\u65b9\u8f49\u8b6f\u7db2\u7ad9\u4f86\u5c07 typescript \u8f49\u8b6f\u6210 javascript \u7684\u5167\u5bb9\u3002\u7136\u800c\u5728 Angular \u4e2d\u5982\u4f55\u5c07\u5217\u8209\u503c\u4e2d\u6240\u6709\u7684\u5143\u7d20\u90fd\u5217\u51fa\u4f86\u5462\uff0c\u9019\u5247\u662f\u6211\u5011\u4eca\u5929\u8981\u804a\u7684\u8a71\u984c\u3002<\/p>\n
Angular 6+\u7684\u89e3\u6cd5<\/h1>\n
\u5728Angular 6\u6642\u65b0\u589e\u4e86\u4e00\u500b pipe<\/code> \uff0c\u53eb\u505a keyvalue<\/code> \u5c31\u662f\u5c08\u9580\u5c07\u5143\u7d20\u4e2d\u7684 key<\/code> \u8ddf value<\/code> \u53d6\u51fa\u4f86\uff0c\u8aaa\u5230\u9019\u908a\u8b80\u8005\u5011\u61c9\u8a72\u80fd\u9ad4\u6703\u5230\uff0c\u963f\u9019\u5c31\u662f\u6211\u5011\u8981\u7684\u6771\u897f\u4e86\uff0c\u6240\u4ee5\u900f\u904e keyvalue<\/code> \u6211\u5011\u53ef\u4ee5\u5728 template \u5167\u7528\u4ee5\u4e0b\u7684\u65b9\u6cd5\u5c07\u4e0b\u62c9\u9078\u55ae\u7d66\u5448\u73fe\u51fa\u4f86\uff1a<\/p>\n
<select [(ngModel)]="selectedCurrency">\n    <option\n        *ngFor="let currency of currencies | keyvalue" \n        value="{{currency.key}}">\n            {{currency.value}}\n    <\/option>\n<\/select><\/code><\/pre>\n
\u7136\u800c\u5728 component.ts \u4e2d\u7528\u4e0b\u5217\u7684\u5167\u5bb9\u5b9a\u7fa9\uff0c\u5c31\u53ef\u4ee5\u5c07\u9078\u5b9a\u7684\u503c\u52d5\u614b\u7d81\u5b9a\u5230 selectedCurrency \u4e2d\uff1a<\/p>\n
export class AppComponent {\n    currencies = Currency;\n    selectedCurrency: Currency;\n}<\/code><\/pre>\n
\u5982\u6b64\u5c31\u53ef\u4ee5\u5b8c\u6210\u5c07 enum \u8f49\u63db\u6210\u4e0b\u62c9\u9078\u55ae\u4e86\u3002<\/p>\n
\u5728 Angular 6\u4e4b\u524d\u5462<\/h1>\n
\u9019\u500b\u554f\u984c\u7684\u89e3\u6cd5\u5f88\u7c21\u55ae\uff0c\u5c31\u662f\u5347\u7d1a\u5230 Angular 6 \u4ee5\u4e0a\u5c31\u53ef\u4ee5\u4e86\uff0c\u56e0\u70ba Angular 6 \u7684\u5347\u7d1a\u6709\u5de5\u5177\u53ef\u4ee5\u81ea\u52d5\u5316\u6aa2\u6e2c\u3001\u66f4\u65b0\uff0c\u6240\u4ee5\u5347\u7d1a Angular \u662f\u4e0d\u56f0\u96e3\u7684\uff0c\u4f46\u662f\u5982\u679c\u771f\u7684\u4e0d\u9858\u610f\u5347\u7d1a\u7684\u8a71\u53ef\u4ee5\u900f\u904e\u81ea\u8a02 pipe<\/code> \u4f86\u5b8c\u6210\uff0c\u7c21\u55ae\u5c31\u662f\u5148\u8f38\u5165\u4ee5\u4e0b\u6307\u4ee4\uff1a<\/p>\n
$ ng generate pipe MapToIterable<\/code><\/pre>\n
\u7136\u5f8c\u5c07 .pipe.ts \u7684\u5167\u5bb9\u7f6e\u63db\u6210\u4ee5\u4e0b\u5167\u5bb9\u5373\u53ef\uff1a<\/p>\n
import { Pipe, PipeTransform } from '@angular\/core';\n@Pipe({\n  name: 'mapToIterable'\n})\nexport class MapToIterable implements PipeTransform {\n  transform(v: any, args?: any): any {\n    return Object.keys(v).map(k => {\n      return {\n        key: k,\n        value: v[k]\n      };\n    });\n  }\n}<\/code><\/pre>\n
\u4f7f\u7528\u65b9\u6cd5\u5c31\u662f\u5c07\u4e0a\u5217\u7684 template keyvalue<\/code> \u90e8\u5206\u6539\u70ba mapToIterable<\/code> \u5373\u53ef\uff0c\u5982\u4e0b\u5217\u6240\u793a\uff1a<\/p>\n
<select [(ngModel)]="selectedCurrency">\n    <option\n        *ngFor="let currency of currencies | mapToIterable" \n        value="{{currency.key}}">\n            {{currency.value}}\n    <\/option>\n<\/select><\/code><\/pre>\n
\u5982\u6b64\u4e0d\u8ad6\u8b80\u8005\u5011\u7528\u7684 Angular \u662f6\u4e4b\u524d\u9084\u662f6\u4e4b\u5f8c\u90fd\u53ef\u4ee5\u7c21\u55ae\u5c07 Enum \u8f49\u63db\u70ba\u4e0b\u62c9\u9078\u55ae\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Angular Enum Dropdownlist \u4eca\u5929\u4f86\u8ac7\u8ac7 Angular \u958b\u767c\u7684\u4e00\u4e9b\u5927\u5c0f\u4e8b\uff0c\u76f8\u4fe1\u7a0b\u5f0f\u958b\u767c … <\/p>\n
\u95b1\u8b80\u5168\u6587\u3008Angular Enum \u8981\u5982\u4f55\u8f49\u63db\u70ba\u4e0b\u62c9\u9078\u55ae\u3009<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[2],"tags":[54,66],"class_list":["post-956","post","type-post","status-publish","format-standard","hentry","category-develop","tag-angular","tag-enum"],"_links":{"self":[{"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/posts\/956","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/comments?post=956"}],"version-history":[{"count":22,"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/posts\/956\/revisions"}],"predecessor-version":[{"id":3027,"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/posts\/956\/revisions\/3027"}],"wp:attachment":[{"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/media?parent=956"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/categories?post=956"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/tags?post=956"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}