C# Blazor 5.0 onscroll 事件未触发

Question

我正在尝试使用 @onScroll 事件，但它根本没有触发……如果可能的话，我不喜欢使用 Javascript。

<div @onscroll="OnScrollChangeValue" class="sub-header p-10 d-none d-lg-block">
    <div class="container">
        <div class="row header-wrapper">
            <div class="col-lg-6">
            </div>
            <div class="col-lg-6 text-left">
                <div id="cl_switcher_wrapper">
                </div>
                <div class="dropdown dropdown-store-header dropdown-store-header-left hidden-xs">
                    <a class="circle-action dropdown-toggle" data-login-link="" href="https://nory.sa/login" rel="nofollow">
                        <span class="theme-icon-user"></span>
                    </a>
                </div>
            </div>
        </div>
    </div>
</div>

private async Task  OnScrollChangeValue(EventArgs e)
{
    OnScrollValue = "gg";
}

在 MrC aka Shaun Curtis 回答后，我明白该事件必须在包含大部分页面的同一个开发人员中..但在我的情况下仍然无法正常工作

更新代码

<div @onscroll="OnScrollChangeValue" class="store-home salla-theme_6 color-mode-light font-dinnextltarabic-regular">
    <Header></Header>
    <h1>@OnScrollValue</h1>
    @Body

@代码{

public int OnScrollValue { get; set; }
private void OnScrollChangeValue(EventArgs e)
{
    OnScrollValue++;
}

}

更新 1.0

我删除了 99% 的应用程序，并且事件没有在此处触发代码

<div   @onscroll="OnScrollChangeValue" >


  
    <h1>@OnScrollValue</h1>
    @Body

我关闭了 div 但它没有显示在这里 idk

@代码{

public int OnScrollValue { get; set; }
private void OnScrollChangeValue(EventArgs e)
{
    OnScrollValue++;
}

}

@body 上只有一个 div 的文本

更新 2.0

似乎事件仅在主页内的子 div 内触发。我的意思是该主页的主滚动条不会触发该事件。但如果您尝试将 div 设置为溢出样式：滚动则该事件只会在具有溢出的 div 内触发：滚动...如果您尝试将溢出滚动放在主 div 中，它将不起作用

style="height:1000px;overflow:scroll" 它适用于这行代码，但我有两个滚动条，一个在左边，另一个在右边

Answer 1

你不需要恢复到 JS，这个简单的演示展示了滚动事件的工作。你需要看看你的 CSS 类在做什么。

@page "/Scroll"
<h3>Scrolling</h3>

<div class="scroll" @onscroll="OnScroll">
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</div>
<div class="m-2 p-2">Scroll events: @counter</div>


<style>

    div.scroll {
        margin: 4px, 4px;
        padding: 4px;
        width: 500px;
        height: 110px;
        overflow-x: hidden;
        overflow-y: auto;
        text-align: justify;
    }
</style>

@code {

    private int counter;

    private void OnScroll()
    {
        counter++;
    }

}