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Blazorでダイアログを出したい

Last updated at Posted at 2022-03-18

Step1_ダイアログのテンプレート

TemplateDialog.razor
@if (isShow)
{
<div class="dialog-outer" @onclick="@(() => this.Close())">
    <div class="dialog-content" @onclick:stopPropagation="true">
        @ChildContent
    </div>
</div>
}


@code {
    [Parameter]
    public RenderFragment ChildContent { get; set; } = null!;

    private bool isShow;

    public void Show()
    {
        this.isShow = true;
        this.StateHasChanged();
    }

    public void Close()
    {
        this.isShow = false;
        this.StateHasChanged();
    }
}
TemplateDialog.razor.css
.dialog-outer {
    display: flex;
    justify-content: center;
    align-items: center;
    position: fixed;
    top: 0px;
    left: 0px;
    width: 100vw;
    height: 100vh;
    background-color: rgba(75, 85, 99, 0.8);
}

.dialog-content{
    max-height: 90vh;
    max-width: 90vh;
    overflow: auto;
    background-color: white;
}

Step2_ダイアログの基底クラス

AbstractDialog.cs
    public abstract class AbstractDialog : ComponentBase
    {
        /// <summary>
        /// Dialog参照
        /// </summary>
        protected TemplateDialog TemplateDialog { get; set; } = new TemplateDialog();

        /// <summary>
        /// ダイアログを開く
        /// </summary>
        public virtual void Show()
        {
            TemplateDialog.Show();
        }

        /// <summary>
        /// ダイアログを閉じる
        /// </summary>
        public virtual void Close()
        {
            TemplateDialog.Close();
        }
    }

Step3_好きなダイアログ作る

TemplateDialog.razor
@inherits AbstractDialog

<TemplateDialog @ref="TemplateDialog">
    <h2>ダイアログサンプル</h2>
    <hr />
    <hr />
    <p>本日は晴天なり本日は晴天なり</p>
    <p>あいうえおカキクケコ</p>


    @*Close()を呼び出して閉じる*@
    <Button @onclick="()=> this.Close()">閉じる</Button>
</TemplateDialog>

Step4_ダイアログを呼び出したい画面に貼り付ける

Index.razor
@page "/"

// step2 - ダイアログの参照紐付けて
<TemplateDialog @ref="_dialog" />

// step3 - 好きなタイミングで.Show()を呼ぶ
<button @onclick="()=> _dialog.Show()">開く</button>
@code{
    // step1 - ダイアログインスタンス作って
    private TemplateDialog _dialog = new TemplateDialog();
}

結果

image.png

閉じるボタンか背景のグレーをタッチするとダイアログが消えます。
image.png

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