使用IronPDF的ChromePdfRenderOptions.JavaScriptMessageListener屬性，您可以新增一個方法回呼，以便在有新的瀏覽器控制台消息時調用。 這對於偵錯或處理特定的客戶端事件非常有用。 欲了解此功能的詳細資訊，請造訪IronPDF的JavaScript控制台消息文件。
using IronPdf;
using System;
var renderOptions = new ChromePdfRenderOptions
{
// Method callback to be invoked whenever a browser console message becomes available:
JavascriptMessageListener = message => Console.WriteLine($"JS: {message}"),
Javascript = "console.log('foo');",
};
var pdf = new ChromePdfRenderer { RenderingOptions = renderOptions }.RenderHtmlAsPdf("<h1> Hello World </h1>");
// Example of JavaScript that will cause an error:
renderOptions.Javascript = "document.querySelector('non-existent').style.color='foo';";
// message => Uncaught TypeError: Cannot read properties of null (reading 'style')
Imports IronPdf
Imports System
Dim renderOptions = New ChromePdfRenderOptions With {
.JavascriptMessageListener = Sub(message) Console.WriteLine($"JS: {message}"),
.Javascript = "console.log('foo');"
}
Dim pdf = New ChromePdfRenderer With {.RenderingOptions = renderOptions}.RenderHtmlAsPdf("<h1> Hello World </h1>")
' Example of JavaScript that will cause an error:
renderOptions.Javascript = "document.querySelector('non-existent').style.color='foo';"
' message => Uncaught TypeError: Cannot read properties of null (reading 'style')
