Oyente de mensajes JavaScript

VB C#

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

Private renderOptions = New ChromePdfRenderOptions With {
	.JavascriptMessageListener = Sub(message) Console.WriteLine($"JS: {message}"),
	.Javascript = "console.log('foo');"
}

Private 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')

Install-Package IronPdf

Oyente de mensajes JavaScript

With IronPDF's ChromePdfRenderOptions.JavascriptMessageListener property, you can add a method callback to be invoked whenever a browser console message becomes available. This can be particularly useful for debugging or handling specific client-side events. Learn more about this feature by visiting the IronPDF Documentation on Javascript Console Messages.

Explore How to Convert JavaScript to PDF with IronPDF

Ver en GitHub

Código

https://github.com/iron-software/IronPdf.Examples/tree/main/examples/javascript-message-listener

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