{"id":1966,"date":"2022-02-07T00:00:10","date_gmt":"2022-02-06T15:00:10","guid":{"rendered":"https:\/\/www.ishikawasekkei.com\/?p=1966"},"modified":"2022-02-06T23:14:36","modified_gmt":"2022-02-06T14:14:36","slug":"angular-stackblitz-com-angular-introduction-reactive-form","status":"publish","type":"post","link":"https:\/\/www.ishikawasekkei.com\/index.php\/2022\/02\/07\/angular-stackblitz-com-angular-introduction-reactive-form\/","title":{"rendered":"Angular\u59cb\u3081\u307e\u3057\u305f – \u30ea\u30a2\u30af\u30c6\u30a3\u30d6\u30d5\u30a9\u30fc\u30e0\u3092\u4f7f\u3063\u3066\u307f\u308b\u3002\u305d\u3057\u3066\u3001stackblitz.com\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u7d44\u307f\u8fbc\u3093\u3067\u307f\u308b"},"content":{"rendered":"\n

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\u5148\u65e5\u306b\u5f15\u304d\u7d9a\u304d\u3001Angular\u3092\u52c9\u5f37\u3057\u3066\u3044\u307e\u3059\u3002\u4eca\u56de\u306f\u30ea\u30a2\u30af\u30c6\u30a3\u30d6\u30d5\u30a9\u30fc\u30e0\u3092\u4f7f\u3063\u3066\u3001\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u4f5c\u3063\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

\u51fa\u6765\u4e0a\u304c\u308a\u30a4\u30e1\u30fc\u30b8<\/h2>\n\n\n\n

\u3000\u3000\u4eca\u56de\u306f\u3001\u305f\u307e\u305f\u307e\u30cb\u30e5\u30fc\u30c8\u30f3\uff0d\u30e9\u30d5\u30bd\u30f3\u6cd5\u306b\u3064\u3044\u3066\u8cea\u554f\u304c\u3042\u3063\u305f\u306e\u3067\u3001Angular\u3067\u5b9f\u88c5\u3057\u3066\u307f\u307e\u3057\u305f\u3002\u3053\u3093\u306a\u611f\u3058\u306b\u306a\u308a\u307e\u3059\u3002\u30eb\u30fc\u30c8\u3092\u6c42\u3081\u305f\u3044\u5024\u300ck\u300d\u3092\u5165\u529b\u3057\u3066\u3001Calc\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001\u6f38\u5316\u5f0f\u3092\u7e70\u308a\u8fd4\u3057\u307e\u3059\u3002\u4e8c\u4e57\u3057\u305f\u7d50\u679c\u304c\u300ck\u300d\u3068\u306e\u8aa4\u5dee0.01\u672a\u6e80\u306b\u306a\u3063\u305f\u3089\u7d42\u4e86\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\"\"
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\u3000\u4eca\u56de\u3082\u3001statsblitz.com\u3092\u5229\u7528\u3057\u3066\u307f\u307e\u3057\u305f\u3002\u4f5c\u696d\u4e2d\u306b\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u300chello.component.ts\u300d\u3092\u524a\u9664\u3057\u3066\u307f\u305f\u3068\u3053\u308d\u3001\u4ee5\u4e0b\u306e\u30a8\u30e9\u30fc\u304c\u3067\u307e\u3057\u305f\u3002\u3057\u3070\u3089\u304f\u89e3\u6c7a\u3067\u304d\u306a\u304f\u3066\u3001\u4f55\u304b\u306e\u8a2d\u5b9a\u304c\u3042\u308b\u306e\u304b\u3068\u3001\u30a6\u30ed\u30a6\u30ed\u3057\u3066\u3057\u307e\u3063\u305f\u306e\u3067\u3001\u56de\u907f\u7b56\u3092\u30e1\u30e2\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n\n\n\n

Error in src\/app\/hello.component.ts (1:1)\nFile '\/~\/src\/app\/hello.component.ngtypecheck.ts' not found.<\/pre>\n\n\n\n
\u3000\u4f55\u306e\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3001\u304a\u304b\u3057\u306a\u72b6\u614b\u306b\u306a\u3063\u3066\u3044\u308b\u3060\u3051\u3001\u3068\u3044\u3046\u3053\u3068\u306e\u3088\u3046\u3067\u3057\u305f\u3002\u753b\u9762\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u30a8\u30af\u30b9\u30d7\u30ed\u30fc\u30e9\u30fc\u306e\u5de6\u4e0b\u306e\u300cDEPENDENCIES\u300d\u3092\u30dd\u30a4\u30f3\u30c8\u3059\u308b\u3068\u3001\u304f\u308b\u308a\u3068\u306a\u3063\u305f\u77e2\u5370\u304c\u767b\u5834\u3059\u308b\u306e\u3067\u3001\u305d\u3061\u3089\u3092\u30af\u30ea\u30c3\u30af\u3057\u305f\u3068\u3053\u308d\u3001\u3057\u3070\u3089\u304f\u5f85\u3063\u3066\u3001\u30a8\u30e9\u30fc\u304c\u6d88\u3048\u307e\u3057\u305f\u3002<\/p>\n\n\n\n
\"\"
DEPENDENCIES\u306e\u89e3\u6c7a<\/figcaption><\/figure>\n\n\n\n
\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9<\/h2>\n\n\n\n
\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n
\u307e\u305a\u306f\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30b9\u30af\u30ea\u30d7\u30c8\u3067\u3059\u3002\u30ea\u30a2\u30af\u30c6\u30a3\u30d6\u30d5\u30a9\u30fc\u30e0\u306e\u30dd\u30a4\u30f3\u30c8\u306f\u300cFormGroup\u300d\u3067\u3059\u306d\u3002TypeScript\u5074\u3067\u300cmyGroup\u300d\u3068\u3057\u3066\u5b9a\u7fa9\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u4eca\u56de\u306fFormBuilder\u3092\u4f7f\u3063\u3066\u300ck\u300d\u3092\u5b9a\u7fa9\u3057\u307e\u3057\u305f\u3002\u307e\u305f\u3001Validators\u3092\u4f7f\u3063\u3066\u3001\u6b63\u306e\u6570\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3057\u305f\u3002
onSubmit()\u547c\u3073\u51fa\u3057\u6642\u3001\u6f38\u5316\u5f0f\u3067\u8a08\u7b97\u3092\u5b9f\u884c\u3057\u3066\u3001\u4e8c\u4e57\u3057\u305f\u7d50\u679c\u304ck\u306b\u8fd1\u3065\u3044\u3066\u5dee\u304c0.01\u3092\u4e0b\u56de\u3063\u305f\u3068\u3053\u308d\u3067\u51e6\u7406\u3092\u5b8c\u4e86\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
import { Component, OnInit } from '@angular\/core';\nimport { FormGroup, FormBuilder, Validators } from '@angular\/forms';\n\n@Component({\n  selector: 'app-x2',\n  templateUrl: '.\/x2.component.html',\n  styleUrls: ['.\/x2.component.css'],\n})\nexport class X2Component implements OnInit {\n  myGroup: FormGroup;\n  results: string[];\n  guess: number;\n\n  constructor(private fb: FormBuilder) {}\n\n  ngOnInit() {\n    this.myGroup = this.fb.group({\n      k: [24, Validators.min(0)],\n    });\n  }\n\n  get k() { return this.myGroup.get('k'); }\n\n  onSubmit() {\n    console.log('Executed!')\n    this.results = [];\n    let k: number = this.k.value;\n    let epsilon: number = 0.01;\n    let guess: number = k \/ 2;\n    let newGuess: number;\n    while (Math.abs(guess * guess - k) >= epsilon) {\n      newGuess = guess - (guess ** 2 - k) \/ (2 * guess);\n      if (this.results.length == 0) {\n        this.results.push(guess.toString() + ' => ' + newGuess.toString());\n      } else {\n        this.results.push(' => ' + newGuess.toString());\n      }\n      guess = newGuess;\n    }\n    this.guess = guess;\n  }\n}\n<\/pre>\n\n\n\n
\u3000\u305d\u3057\u3066\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306eHTML\u30d5\u30a1\u30a4\u30eb\u3067\u3059\u3002<\/p>\n\n\n\n
<p>\n\u30cb\u30e5\u30fc\u30c8\u30f3\uff0d\u30e9\u30d5\u30bd\u30f3\u6cd5\u3067k\u306e\u6839\u3092\u6c42\u3081\u307e\u3059\u3002\n<\/p>\n<p>\nf(x) = x<sup>2<\/sup> - k<br>\nx<sub>n + 1<\/sub> = x<sub>n<\/sub> - f(x) \/ f'(x) = x<sub>n<\/sub> - (x<sub>n<\/sub><sup>2<\/sup> - k)\/2x<sub>n<\/sub>\n<\/p>\n<form [formGroup]=\"myGroup\" (submit)=\"onSubmit()\">\n  <table>\n    <tr>\n      <th>k<\/th>\n      <td><input type=\"number\" formControlName=\"k\"><\/td>\n    <\/tr>\n    <tr>\n      <th><\/th>\n       <td *ngIf=\"k.invalid\" [style.color]=\"'red'\">\u6b63\u306e\u6570\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/td>\n    <\/tr>\n    <tr>\n      <th><\/th>\n      <td>\n        <input type=\"submit\" value=\"Calc\" [disabled]=\"myGroup.invalid\">\n      <\/td>\n    <\/tr>\n  <\/table>\n<\/form>\n<ul>\n  <li>\u307e\u305a\u3001guess = k \/ 2 = {{k.value}} \/ 2 = {{k.value \/ 2}} \u3068\u3057\u307e\u3059\u3002<br>guess - (guess<sup>2<\/sup> - {{k.value}})\/ (2 \u00d7 guess)\u304c\u3088\u308a\u8fd1\u3044\u5024\u306b\u306a\u308b\u306e\u3067\u3001\u8a08\u7b97\u7d50\u679c\u306e\u8aa4\u5dee\u304c0.01\u306b\u306a\u308b\u307e\u3067\u7e70\u308a\u8fd4\u3057\u307e\u3059\u3002<br>\n    <p *ngIf=\"!results\">Calc\u3092\u62bc\u3057\u3066\u7d9a\u884c\u3057\u307e\u3059\u3002<\/p><\/li>\n  <li *ngFor=\"let ans of results\">{{ans}}<\/li>\n<\/ul>\n<p *ngIf=\"guess\">{{guess}} * {{guess}} = {{guess * guess}}<\/p>\n<\/pre>\n\n\n\n
WordPress\u3078\u306e\u7d44\u307f\u8fbc\u307f<\/h2>\n\n\n\n
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\u3000\u7d44\u307f\u8fbc\u307f\u30d6\u30ed\u30c3\u30af\u306f\u3042\u308b\u306e\u3067\u3059\u304c\u3001stackblitz.com\u7528\u306e\u3082\u306e\u304c\u306a\u304f\u3001\u8abf\u3079\u3066\u3044\u308b\u3068\u3053\u3053<\/a>\u306b\u66f8\u3044\u3066\u3042\u308a\u307e\u3057\u305f\u3002iframe\u30bf\u30b0\u3092\u4f7f\u3063\u3066\u3001\u3068\u3044\u3046\u3053\u3068\u3060\u3063\u305f\u306e\u3067\u3001\u5b9f\u9a13\u3057\u3066\u307f\u307e\u3057\u305f\u3068\u3053\u308d\u3001\u4ee5\u4e0b\u306e\u3068\u304a\u308a\u3001\u5b9f\u884c\u3067\u304d\u307e\u3057\u305f\uff01<\/p>\n\n\n\n