記事編集

日付

ジャンルのカテゴリ―名

タイトル

内容の要旨

<p style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 4px; padding: revert; -webkit-line-clamp: revert; color: rgba(0, 0, 0, 0.8); font-family: roboto, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;" data-pasted="true">以下は、前回のサンプルを改良した&nbsp;<strong style="font-weight: 700;">ASP.NET Core MVC</strong> 実装例です。<br>主な変更点は以下の通りです。</p><ul style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: revert; padding: revert; color: rgba(0, 0, 0, 0.8); font-family: roboto, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"><li style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin-top: revert; margin-right: revert; margin-bottom: 8px; margin-left: revert; padding: revert;"><strong style="font-weight: 700;">CSRF 対策</strong> を&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">@Html.AntiForgeryToken()</code> と&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">RequestVerificationToken</code> ヘッダーで確実に実装</li><li style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin-top: revert; margin-right: revert; margin-bottom: 8px; margin-left: revert; padding: revert;"><strong style="font-weight: 700;">新規カテゴリ追加時の UI 改善</strong>（追加後に即選択状態にする）</li><li style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin-top: revert; margin-right: revert; margin-bottom: 8px; margin-left: revert; padding: revert;"><strong style="font-weight: 700;">エラーハンドリング強化</strong>（サーバー側・クライアント側両方）</li><li style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin-top: revert; margin-right: revert; margin-bottom: 8px; margin-left: revert; padding: revert;"><strong style="font-weight: 700;">SelectList の更新位置を「+ 項目を追加」の直前」に固定</strong></li></ul><h2 style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: revert; padding: revert; font: 22px / 24px roboto, helvetica, sans-serif; height: 32px; -webkit-line-clamp: 1; overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-box-orient: vertical; color: rgba(0, 0, 0, 0.8); letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">1. ViewModel</h2><pre data-priority="2" style="background: none 0% 0% / auto repeat scroll padding-box border-box rgb(245, 245, 245); border: 1px solid rgba(0, 0, 0, 0.1); border-radius: 8px; overflow: hidden; color: rgba(0, 0, 0, 0.8); font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"><div data-bm="74" style="display: flex; height: 28px; flex-direction: row; justify-content: space-between; align-items: center; gap: 8px; padding: 8px 12px; border-bottom: 1px solid rgba(0, 0, 0, 0.1); background: none 0% 0% / auto repeat scroll padding-box border-box rgb(248, 244, 241);"><h5 style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 0px; padding: revert; font-style: normal !important; font-variant: normal !important; font-weight: 400 !important; font-stretch: 100% !important; line-height: 18px; font-family: roboto, helvetica, sans-serif !important; font-optical-sizing: auto !important; font-size-adjust: none !important; font-kerning: auto !important; font-feature-settings: normal !important; font-variation-settings: normal !important; font-language-override: normal !important; font-size: 16px; display: inline-block; color: rgb(60, 81, 180);">Csharp</h5><div style="height: 28px;"><button type="button" tabindex="" title="Copy code" style="box-sizing: border-box; margin: 0px; padding: 0px; font: 400 13px / 20px roboto, helvetica, sans-serif; background-color: rgb(217, 223, 251); border: 1px solid rgba(0, 0, 0, 0); display: grid; grid-auto-flow: column; align-items: center; cursor: pointer; color: rgb(60, 81, 180) !important; text-decoration: none !important; border-radius: 9999px; block-size: 28px; gap: 2px; padding-inline: 10px;"><div style="box-sizing: border-box; margin: 0px; padding: 0px; min-inline-size: 0px; max-inline-size: 100%; white-space: nowrap; text-overflow: ellipsis; overflow: clip; max-block-size: calc(1lh); padding-inline: 2px;">Copy code</div></button></div></div><code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255); display: block; white-space: pre-wrap; overflow-wrap: anywhere; padding: 8px 16px 16px;"><span style="color: rgb(215, 58, 73);">public</span> <span style="color: rgb(215, 58, 73);">class</span> <span style="color: rgb(111, 66, 193);">IncomeViewModel</span>
{
    <span style="color: rgb(215, 58, 73);">public</span> <span style="color: rgb(227, 98, 9);">int</span> IncomeCategoryId { <span style="color: rgb(215, 58, 73);">get</span>; <span style="color: rgb(215, 58, 73);">set</span>; }
    <span style="color: rgb(215, 58, 73);">public</span> IEnumerable&lt;SelectListItem&gt; IncomeCategories { <span style="color: rgb(215, 58, 73);">get</span>; <span style="color: rgb(215, 58, 73);">set</span>; }
}
</code></pre><h2 style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: revert; padding: revert; font: 22px / 24px roboto, helvetica, sans-serif; height: 32px; -webkit-line-clamp: 1; overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-box-orient: vertical; color: rgba(0, 0, 0, 0.8); letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">2. Controller</h2><pre data-priority="2" style="background: none 0% 0% / auto repeat scroll padding-box border-box rgb(245, 245, 245); border: 1px solid rgba(0, 0, 0, 0.1); border-radius: 8px; overflow: hidden; color: rgba(0, 0, 0, 0.8); font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"><div data-bm="75" style="display: flex; height: 28px; flex-direction: row; justify-content: space-between; align-items: center; gap: 8px; padding: 8px 12px; border-bottom: 1px solid rgba(0, 0, 0, 0.1); background: none 0% 0% / auto repeat scroll padding-box border-box rgb(248, 244, 241);"><h5 style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 0px; padding: revert; font-style: normal !important; font-variant: normal !important; font-weight: 400 !important; font-stretch: 100% !important; line-height: 18px; font-family: roboto, helvetica, sans-serif !important; font-optical-sizing: auto !important; font-size-adjust: none !important; font-kerning: auto !important; font-feature-settings: normal !important; font-variation-settings: normal !important; font-language-override: normal !important; font-size: 16px; display: inline-block; color: rgb(60, 81, 180);">Csharp</h5><div style="height: 28px;"><button type="button" tabindex="" title="Copy code" style="box-sizing: border-box; margin: 0px; padding: 0px; font: 400 13px / 20px roboto, helvetica, sans-serif; background-color: rgb(217, 223, 251); border: 1px solid rgba(0, 0, 0, 0); display: grid; grid-auto-flow: column; align-items: center; cursor: pointer; color: rgb(60, 81, 180) !important; text-decoration: none !important; border-radius: 9999px; block-size: 28px; gap: 2px; padding-inline: 10px;"><div style="box-sizing: border-box; margin: 0px; padding: 0px; min-inline-size: 0px; max-inline-size: 100%; white-space: nowrap; text-overflow: ellipsis; overflow: clip; max-block-size: calc(1lh); padding-inline: 2px;">Copy code</div></button></div></div><code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255); display: block; white-space: pre-wrap; overflow-wrap: anywhere; padding: 8px 16px 16px;"><span style="color: rgb(215, 58, 73);">using</span> Microsoft.AspNetCore.Mvc;
<span style="color: rgb(215, 58, 73);">using</span> Microsoft.AspNetCore.Mvc.Rendering;
<span style="color: rgb(215, 58, 73);">using</span> System.Linq;

<span style="color: rgb(215, 58, 73);">public</span> <span style="color: rgb(215, 58, 73);">class</span> <span style="color: rgb(111, 66, 193);">IncomeController</span> : <span style="color: rgb(111, 66, 193);">Controller</span>
{
    <span style="color: rgb(215, 58, 73);">private</span> <span style="color: rgb(215, 58, 73);">readonly</span> AppDbContext _context;

    <span style="color: rgb(215, 58, 73);">public</span> <span style="color: rgb(111, 66, 193);">IncomeController</span>(AppDbContext context)
    {
        _context = context;
    }

    <span style="color: rgb(106, 115, 125);">// GET: Create</span>
    <span style="color: rgb(215, 58, 73);">public</span> IActionResult <span style="color: rgb(111, 66, 193);">Create</span>()
    {
        <span style="color: rgb(215, 58, 73);">var</span> vm = <span style="color: rgb(215, 58, 73);">new</span> IncomeViewModel
        {
            IncomeCategories = _context.IncomeCategories
                .Select(c =&gt; <span style="color: rgb(215, 58, 73);">new</span> SelectListItem { Value = c.Id.ToString(), Text = c.Name })
                .ToList()
        };
        <span style="color: rgb(215, 58, 73);">return</span> View(vm);
    }

    <span style="color: rgb(106, 115, 125);">// POST: Create</span>
    [<span style="color: rgb(0, 92, 197);">HttpPost</span>]
    [<span style="color: rgb(0, 92, 197);">ValidateAntiForgeryToken</span>]
    <span style="color: rgb(215, 58, 73);">public</span> IActionResult <span style="color: rgb(111, 66, 193);">Create</span>(IncomeViewModel model)
    {
        <span style="color: rgb(215, 58, 73);">if</span> (model.IncomeCategoryId &lt;= <span style="color: rgb(0, 92, 197);">0</span>)
        {
            ModelState.AddModelError(<span style="color: rgb(3, 47, 98);">&quot;&quot;</span>, <span style="color: rgb(3, 47, 98);">&quot;カテゴリを選択してください&quot;</span>);
        }

        <span style="color: rgb(215, 58, 73);">if</span> (!ModelState.IsValid)
        {
            model.IncomeCategories = _context.IncomeCategories
                .Select(c =&gt; <span style="color: rgb(215, 58, 73);">new</span> SelectListItem { Value = c.Id.ToString(), Text = c.Name })
                .ToList();
            <span style="color: rgb(215, 58, 73);">return</span> View(model);
        }

        <span style="color: rgb(106, 115, 125);">// 保存処理例</span>
        <span style="color: rgb(106, 115, 125);">// var income = new Income { CategoryId = model.IncomeCategoryId, ... };</span>
        <span style="color: rgb(106, 115, 125);">// _context.Incomes.Add(income);</span>
        <span style="color: rgb(106, 115, 125);">// _context.SaveChanges();</span>

        <span style="color: rgb(215, 58, 73);">return</span> RedirectToAction(<span style="color: rgb(3, 47, 98);">&quot;Index&quot;</span>);
    }

    <span style="color: rgb(106, 115, 125);">// Ajax: 新しいカテゴリ追加</span>
    [<span style="color: rgb(0, 92, 197);">HttpPost</span>]
    [<span style="color: rgb(0, 92, 197);">ValidateAntiForgeryToken</span>]
    <span style="color: rgb(215, 58, 73);">public</span> IActionResult <span style="color: rgb(111, 66, 193);">AddCategory</span>([FromBody] CategoryRequest request)
    {
        <span style="color: rgb(215, 58, 73);">if</span> (<span style="color: rgb(227, 98, 9);">string</span>.IsNullOrWhiteSpace(request?.Name))
            <span style="color: rgb(215, 58, 73);">return</span> BadRequest(<span style="color: rgb(215, 58, 73);">new</span> { message = <span style="color: rgb(3, 47, 98);">&quot;カテゴリ名は必須です&quot;</span> });

        <span style="color: rgb(215, 58, 73);">var</span> category = <span style="color: rgb(215, 58, 73);">new</span> IncomeCategory { Name = request.Name.Trim() };
        _context.IncomeCategories.Add(category);
        _context.SaveChanges();

        <span style="color: rgb(215, 58, 73);">return</span> Json(<span style="color: rgb(215, 58, 73);">new</span> { id = category.Id, name = category.Name });
    }

    <span style="color: rgb(215, 58, 73);">public</span> <span style="color: rgb(215, 58, 73);">class</span> <span style="color: rgb(111, 66, 193);">CategoryRequest</span>
    {
        <span style="color: rgb(215, 58, 73);">public</span> <span style="color: rgb(227, 98, 9);">string</span> Name { <span style="color: rgb(215, 58, 73);">get</span>; <span style="color: rgb(215, 58, 73);">set</span>; }
    }
}
</code></pre><h2 style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: revert; padding: revert; font: 22px / 24px roboto, helvetica, sans-serif; height: 32px; -webkit-line-clamp: 1; overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-box-orient: vertical; color: rgba(0, 0, 0, 0.8); letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">3. Create.cshtml</h2><pre data-priority="2" style="background: none 0% 0% / auto repeat scroll padding-box border-box rgb(245, 245, 245); border: 1px solid rgba(0, 0, 0, 0.1); border-radius: 8px; overflow: hidden; color: rgba(0, 0, 0, 0.8); font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"><div data-bm="76" style="display: flex; height: 28px; flex-direction: row; justify-content: space-between; align-items: center; gap: 8px; padding: 8px 12px; border-bottom: 1px solid rgba(0, 0, 0, 0.1); background: none 0% 0% / auto repeat scroll padding-box border-box rgb(248, 244, 241);"><h5 style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 0px; padding: revert; font-style: normal !important; font-variant: normal !important; font-weight: 400 !important; font-stretch: 100% !important; line-height: 18px; font-family: roboto, helvetica, sans-serif !important; font-optical-sizing: auto !important; font-size-adjust: none !important; font-kerning: auto !important; font-feature-settings: normal !important; font-variation-settings: normal !important; font-language-override: normal !important; font-size: 16px; display: inline-block; color: rgb(60, 81, 180);">Razor</h5><div style="height: 28px;"><button type="button" tabindex="" title="Copy code" style="box-sizing: border-box; margin: 0px; padding: 0px; font: 400 13px / 20px roboto, helvetica, sans-serif; background-color: rgb(217, 223, 251); border: 1px solid rgba(0, 0, 0, 0); display: grid; grid-auto-flow: column; align-items: center; cursor: pointer; color: rgb(60, 81, 180) !important; text-decoration: none !important; border-radius: 9999px; block-size: 28px; gap: 2px; padding-inline: 10px;"><div style="box-sizing: border-box; margin: 0px; padding: 0px; min-inline-size: 0px; max-inline-size: 100%; white-space: nowrap; text-overflow: ellipsis; overflow: clip; max-block-size: calc(1lh); padding-inline: 2px;">Copy code</div></button></div></div><code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255); display: block; white-space: pre-wrap; overflow-wrap: anywhere; padding: 8px 16px 16px;">@model IncomeViewModel

&lt;form asp-action=&quot;Create&quot; method=&quot;post&quot;&gt;
    @Html.AntiForgeryToken()

    &lt;div class=&quot;form-group&quot;&gt;
        &lt;label asp-for=&quot;IncomeCategoryId&quot;&gt;&lt;/label&gt;
        &lt;select asp-for=&quot;IncomeCategoryId&quot; class=&quot;form-control&quot; id=&quot;IncomeCategoryId&quot;
                asp-items=&quot;Model.IncomeCategories&quot;&gt;
            &lt;option value=&quot;&quot;&gt;-- 選択してください --&lt;/option&gt;
            &lt;option value=&quot;add&quot;&gt;+ 項目を追加&lt;/option&gt;
        &lt;/select&gt;
    &lt;/div&gt;

    &lt;button type=&quot;submit&quot; class=&quot;btn btn-primary&quot;&gt;保存&lt;/button&gt;
&lt;/form&gt;

&lt;!-- モーダル --&gt;
&lt;div class=&quot;modal fade&quot; id=&quot;addCategoryModal&quot; tabindex=&quot;-1&quot;&gt;
    &lt;div class=&quot;modal-dialog&quot;&gt;
        &lt;div class=&quot;modal-content&quot;&gt;
            &lt;div class=&quot;modal-header&quot;&gt;
                &lt;h5 class=&quot;modal-title&quot;&gt;新しいカテゴリを追加&lt;/h5&gt;
                &lt;button type=&quot;button&quot; class=&quot;btn-close&quot; data-bs-dismiss=&quot;modal&quot;&gt;&lt;/button&gt;
            &lt;/div&gt;
            &lt;div class=&quot;modal-body&quot;&gt;
                &lt;input type=&quot;text&quot; id=&quot;newCategoryName&quot; class=&quot;form-control&quot; placeholder=&quot;カテゴリ名&quot;&gt;
            &lt;/div&gt;
            &lt;div class=&quot;modal-footer&quot;&gt;
                &lt;button type=&quot;button&quot; class=&quot;btn btn-secondary&quot; data-bs-dismiss=&quot;modal&quot;&gt;キャンセル&lt;/button&gt;
                &lt;button type=&quot;button&quot; id=&quot;saveCategoryBtn&quot; class=&quot;btn btn-primary&quot;&gt;追加&lt;/button&gt;
            &lt;/div&gt;
        &lt;/div&gt;
    &lt;/div&gt;
&lt;/div&gt;

@section Scripts {
    &lt;script&gt;
        const categorySelect = document.getElementById(&quot;IncomeCategoryId&quot;);
        const modalElement = document.getElementById(&#39;addCategoryModal&#39;);
        const modalInstance = new bootstrap.Modal(modalElement);

        categorySelect.addEventListener(&quot;change&quot;, function () {
            if (this.value === &quot;add&quot;) {
                this.value = &quot;&quot;;
                modalInstance.show();
            }
        });

        document.getElementById(&quot;saveCategoryBtn&quot;).addEventListener(&quot;click&quot;, function () {
            const name = document.getElementById(&quot;newCategoryName&quot;).value.trim();
            if (!name) {
                alert(&quot;カテゴリ名を入力してください&quot;);
                return;
            }

            fetch(&#39;@Url.Action(&quot;AddCategory&quot;, &quot;Income&quot;)&#39;, {
                method: &#39;POST&#39;,
                headers: {
                    &#39;Content-Type&#39;: &#39;application/json&#39;,
                    &#39;RequestVerificationToken&#39;: document.querySelector(&#39;input[name=&quot;__RequestVerificationToken&quot;]&#39;).value
                },
                body: JSON.stringify({ name: name })
            })
            .then(res =&gt; {
                if (!res.ok) return res.json().then(err =&gt; { throw new Error(err.message || &quot;追加に失敗しました&quot;); });
                return res.json();
            })
            .then(data =&gt; {
                // 「+ 項目を追加」の直前に挿入
                const addOptionIndex = categorySelect.options.length - 1;
                const option = new Option(data.name, data.id, true, true);
                categorySelect.add(option, addOptionIndex);

                modalInstance.hide();
                document.getElementById(&quot;newCategoryName&quot;).value = &quot;&quot;;
            })
            .catch(err =&gt; alert(err.message));
        });
    &lt;/script&gt;
}
</code></pre><h2 style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: revert; padding: revert; font: 22px / 24px roboto, helvetica, sans-serif; height: 32px; -webkit-line-clamp: 1; overflow: hidden; text-overflow: ellipsis; display: -webkit-box; -webkit-box-orient: vertical; color: rgba(0, 0, 0, 0.8); letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">改良ポイント</h2><ol style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: revert; padding: revert; color: rgba(0, 0, 0, 0.8); font-family: roboto, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"><li style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin-top: revert; margin-right: revert; margin-bottom: 8px; margin-left: revert; padding: revert;"><p style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 4px; padding: revert; -webkit-line-clamp: revert;"><strong style="font-weight: 700;">CSRF 対策</strong></p><ul style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: revert; padding: revert;"><li style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin-top: revert; margin-right: revert; margin-bottom: 8px; margin-left: revert; padding: revert;">Razor 側で&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">@Html.AntiForgeryToken()</code> を追加</li><li style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin-top: revert; margin-right: revert; margin-bottom: 8px; margin-left: revert; padding: revert;">Fetch API で&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">RequestVerificationToken</code> ヘッダーを送信</li></ul></li><li style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin-top: revert; margin-right: revert; margin-bottom: 8px; margin-left: revert; padding: revert;"><p style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 4px; padding: revert; -webkit-line-clamp: revert;"><strong style="font-weight: 700;">UI 改善</strong></p><ul style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: revert; padding: revert;"><li style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin-top: revert; margin-right: revert; margin-bottom: 8px; margin-left: revert; padding: revert;">新規追加後に即選択状態にする</li><li style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin-top: revert; margin-right: revert; margin-bottom: 8px; margin-left: revert; padding: revert;">「+ 項目を追加」の直前に新しい&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">&lt;option&gt;</code> を挿入</li></ul></li><li style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin-top: revert; margin-right: revert; margin-bottom: 8px; margin-left: revert; padding: revert;"><p style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 4px; padding: revert; -webkit-line-clamp: revert;"><strong style="font-weight: 700;">エラーハンドリング強化</strong></p><ul style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: revert; padding: revert;"><li style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin-top: revert; margin-right: revert; margin-bottom: 8px; margin-left: revert; padding: revert;">サーバー側で&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">BadRequest</code> を返す場合に JSON メッセージを返却</li><li style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin-top: revert; margin-right: revert; margin-bottom: 8px; margin-left: revert; padding: revert;">クライアント側で&nbsp;<code style="border-radius: 8px; background: none 0% 0% / auto repeat scroll padding-box border-box rgb(255, 255, 255);">.catch()</code> でエラー表示</li></ul></li></ol><p style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 4px; padding: revert; -webkit-line-clamp: revert; color: rgba(0, 0, 0, 0.8); font-family: roboto, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">この形にすると、ページ遷移なしでカテゴリ追加ができ、<br>セキュリティとユーザビリティの両方を確保できます。</p><p style="border: 0px; border-collapse: collapse; border-spacing: 0px; list-style-position: initial; list-style-image: initial; list-style-type: revert; margin: 4px; padding: revert; -webkit-line-clamp: revert; color: rgba(0, 0, 0, 0.8); font-family: roboto, helvetica, sans-serif; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">もし希望があれば、このコードを&nbsp;<strong style="font-weight: 700;">完全に非同期で保存まで行うバージョン</strong> に拡張して、<br>カテゴリ追加後にそのまま新規レコードも保存できるようにできます。<br>それも作りますか？</p><p data-f-id="pbf" style="text-align: center; font-size: 14px; margin-top: 30px; opacity: 0.65; font-family: sans-serif;">Powered by <a href="https://www.froala.com/wysiwyg-editor?pb=1" title="Froala Editor">Froala Editor</a></p>

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