[英]Webforms - RadiobuttonLists client side click event not working
[英]Javascript click event not working in Blazor client side app
我是 Blazor 的新手,我創建了一個非常簡單的 Webassembly 應用程序。 當我點擊它時,我想要一個 href 鏈接轉到頁面下方的 div,但 Javascript 點擊事件不起作用。 在 Index.razor 頁面中, JsRuntime.InvokeVoidAsync("clicker")
正在工作,並且在頁面加載時發生alert("In clicker")
,但是點擊/href 轉到“介紹”div 對愛或錢 :-/
索引.html
<!DOCTYPE html>
<html>
<head>
<title>My Blazor App</title>
<!--script type='text/javascript' src='./scripts/app.js'-->
</head>
<body>
<app>Loading...</app>
<script src="_framework/blazor.webassembly.js"></script>
<script>
function clicker() {
alert("In clicker"); // this works
document.getElementById('skip').onclick = function(e){
alert("clicked"); // this works but the page still won't scroll to the "intro" div :(
}
}
//clicker();
</script>
</body>
</html>
Index.razor(@code 部分位於頁面頂部)
@page "/"
@code {
[Inject]
protected IJSRuntime JsRuntime { get; set; }
protected override void OnAfterRender(bool firstRender)
{
if (firstRender)
{
JsRuntime.InvokeVoidAsync("clicker");
}
}
}
// This link won't go to the intro div when clicked :(
<a id="skip" class="skip" href="#intro">skip this bit</a>
...
<div id="intro" class="home">
...
</div>
啟動文件
public class Startup
{
public void ConfigureServices(IServiceCollection services)
{
}
public void Configure(IComponentsApplicationBuilder app)
{
app.AddComponent<App>("app");
}
}
如果有人可以對此有所了解,那將節省我的一周。
這里不需要 JavaScript。
如果您將特定目標添加到您的標記中,它就會起作用。
您可以使用 target="_top" 來避免Blazor導航攔截。
<a class="skip" href="#intro" target="_top">skip this bit</a>
...
<div id="intro" class="home">
...
</div>
請注意, target="_top"
只是指示瀏覽器在窗口的最頂層框架內導航,並不意味着您將滾動到頂部!
該頁面不會滾動到您在鏈接中指定的元素。這與 Blazor 和大多數其他 SPA 應用程序中路由的處理方式有關。 一個簡單的解決方案是您可以創建自己的 AnchorLink 組件並使用一點 JavaScript 互操作魔法。
AnchorLink.razor
在Pages/Shared
創建AnchorLink.razor
@code {
public AnchorLink()
{
this.Attributes = new Dictionary<string, object>();
}
private string targetId = null;
private bool preventDefault = false;
/// <summary>
/// This parameter supports arbitrary attributes.
/// </summary>
/// <remarks>
/// Any attribute specified on the component, which is not defined as a parameter, whill be added to this dictionary.
/// It is then uses as the source for attributes rendered onto the resulting HTML element below in the markup section
/// of this component.
/// For details, refer to <see cref="https://docs.microsoft.com/en-us/aspnet/core/blazor/components#attribute-splatting-and-arbitrary-parameters"/>.
/// </remarks>
[Parameter(CaptureUnmatchedValues = true)]
public IDictionary<string, object> Attributes { get; set; }
/// <summary>
/// Supports child content for the component.
/// </summary>
/// <see cref="https://docs.microsoft.com/en-us/aspnet/core/blazor/components#child-content"/>
[Parameter]
public RenderFragment ChildContent { get; set; }
[Inject]
protected IJSRuntime JsInterop { get; set; }
protected override void OnParametersSet()
{
string href = null;
if (this.Attributes.ContainsKey("href"))
{
// If the href attribute has been specified, we examine the value of it. If if starts with '#'
// we assume the rest of the value contains the ID of the element the link points to.
href = $"{this.Attributes["href"]}";
if (href.StartsWith("#"))
{
// If the href contains an anchor link we don't want the default click action to occur, but
// rather take care of the click in our own method.
this.targetId = href.Substring(1);
this.preventDefault = true;
}
}
base.OnParametersSet();
}
private async Task AnchorOnClickAsync()
{
if (!string.IsNullOrEmpty(this.targetId))
{
// If the target ID has been specified, we know this is an anchor link that we need to scroll
// to, so we call the JavaScript method to take care of this for us.
await this.JsInterop.InvokeVoidAsync("anchorLink.scrollIntoView", this.targetId);
}
}
}
<a href="" @onclick="this.AnchorOnClickAsync" @onclick:stopPropagation="false" />
<a @attributes="this.Attributes" @onclick="this.AnchorOnClickAsync" @onclick:preventDefault="this.preventDefault">Hello @this.ChildContent</a>
2.在wwwroot/Index.html
js
<script src="_framework/blazor.webassembly.js"></script>
<script>
window.anchorLink = {
scrollIntoView: function (elementId) {
// This function is called from the AnchorLink component using JavaScript interop.
// It will try to find an element using the ID given to the function, and scroll that
// element into view, if an element is found.
var elem = document.getElementById(elementId);
if (elem) {
elem.scrollIntoView();
window.location.hash = elementId;
}
}
}
</script>
Index.razor
<AnchorLink class="skip" href="#intro">skip this bit</AnchorLink>
參考https://mikaberglund.com/2019/12/28/creating-anchor-links-in-blazor-applications/
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