[英]Call JavaScript function (from external library) with Blazor
我尝试调用 JS function。 JS 脚本由第三方提供。
在简单的 HTML/JS 中,我可以编写:
<html>
<head>
<script src="myscriptA.js"></script>
<script src="myscriptB.js"></script>
</head>
<body>
<div id="foo"></div>
<div id="bar"></div>
<script>
var viewer = new foo.Viewer('foo', /*other params*/);
viewer.function1().then(() => { /*ommited code*/ }).catch((error) => { console.log(error)});
document.getElementById('bar').addEventListener('click', event => {
var b1 = new B('bar', /*params*/)});
var b2 = new B('foo');
viewer.addB(b1, b2, { click: function(e) { viewer.function2() } });
</script>
</body>
</html>
我想对 Blazor 做同样的事情。 目前,我可以使用我的组件访问myscriptA.js
文件:
Page3.razor
@page "/Page3"
@inject IJSRuntime JS
@code {
var scriptA = await JSRuntime.InvokeAsync<IJSObjectReference>("import", "./js/myscriptA.js");
var foo = await JSRuntime.InvokeAsync<IJSObjectReference>("new foo.Viewer", scriptA);
// I have try:
var foo = await JSRuntime.InvokeAsync<IJSObjectReference>("new foo.Viewer", "foo", @*other params*@);
var foo = await JSRuntime.InvokeAsync<IJSObjectReference>("foo.Viewer", "foo", @*other params*@);
var foo = await JSRuntime.InvokeAsync<IJSObjectReference>("Viewer", "foo", @*other params*@);
var foo = await JSRuntime.InvokeAsync<IJSObjectReference>("new Viewer", "foo", @*other params*@);
}
对于我的组件中的每个 C# foo 变量,我的浏览器控制台显示:
blazor.webassembly.js:1 crit: Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100]
Unhandled exception rendering component: Could not find 'new foo.Viewer' ('new foo' was undefined).
Error: Could not find 'new foo.Viewer' ('new foo' was undefined).
at https://localhost:5001/_framework/blazor.webassembly.js:1:1287
at Array.forEach (<anonymous>)
at e.findFunction (https://localhost:5001/_framework/blazor.webassembly.js:1:1247)
at b (https://localhost:5001/_framework/blazor.webassembly.js:1:2989)
at https://localhost:5001/_framework/blazor.webassembly.js:1:3935
at new Promise (<anonymous>)
at Object.beginInvokeJSFromDotNet (https://localhost:5001/_framework/blazor.webassembly.js:1:3908)
at Object.w [as invokeJSFromDotNet] (https://localhost:5001/_framework/blazor.webassembly.js:1:64232)
at _mono_wasm_invoke_js_blazor (https://localhost:5001/_framework/dotnet.5.0.4.js:1:190800)
at do_icall (<anonymous>:wasm-function[10596]:0x194e4e)
As written in the comment ( Call JavaScript function (from external library) with Blazor ), I want to inject myscriptA.js
and myscriptB.js
only in Page3.razor
file and not in another files ( Page1
, Page2
, Page4
, ... )。
作为 Blazor 组件的 *.css 文件,我尝试添加与我的页面同名的 *.js 文件:
Project.csproj
Pages
文件夹
Page1.razor
Page2.razor
Page2.razor.css
<-- 见于Shared\NavMenu.razor
Page3.razor
Page3.razor.js
我有同样的错误
你已经接近了.. 要仅在需要的地方(例如,特定页面)加载 JS 文件,您需要实现IJSObjectReference
接口并正确利用 JavaScript 模块隔离。
Razor 页面:
@inject IJSRuntime JsRuntime
<h1>My Page</h1>
@code{
private IJSObjectReference MyJsModule { get; set; }
protected override async Task OnAfterRenderAsync(bool firstRender)
{
if (firstRender)
{
try
{
// Load the JS Helpers Module
MyJsModule = await JsRuntime.InvokeAsync<IJSObjectReference>("import", "./js/MyScript.js");
}
catch (Exception ex)
{
Logger.LogError($"Failed to load JS module. Error: {ex}");
}
}
}
private async void AddViewer()
{
try
{
await MyJsModule.InvokeVoidAsync("AddViewer", "foo");
}
catch (Exception ex)
{
Logger.LogError($"Failed to execute JS function. Error: {ex}");
}
}
MyScript.js 文件:
import "./myScriptWithUsefulCodes.min.js";
export function AddViewer(id) {
var viewer = new foo.Viewer(id, /*other params*/);
/* ...Your code... */
}
难道你不能在你的 Blazor 页面中加载 JavaScript 文件,就像默认的 Blazor 示例加载.json
文件一样吗?
然后使用 IJSRuntime 将该字符串中的内容“执行”为 JavaScript?
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