Execute Custom JavaScript
With IronPDF's ChromePdfRenderOptions.Javascript property, you can specify JavaScipt to be executed after the page has loaded as a string as shown in the example.
using IronPdf;
var renderOptions = new ChromePdfRenderOptions();
// Example that change all to red style in JavaScript:
renderOptions.Javascript = "document.querySelectorAll('h1').forEach(function(el){el.style.color='red';})";
// Make sure to use the render options object that you created:
var renderer = new ChromePdfRenderer { RenderingOptions = renderOptions };
var pdf = renderer.RenderHtmlAsPdf("<h1>Happy New Year!</h1>");
pdf.SaveAs("executed_js.pdf");Imports IronPdf
Private renderOptions = New ChromePdfRenderOptions()
' Example that change all to red style in JavaScript:
renderOptions.Javascript = "document.querySelectorAll('h1').forEach(function(el){el.style.color='red';})"
' Make sure to use the render options object that you created:
Dim renderer = New ChromePdfRenderer With {.RenderingOptions = renderOptions}
Dim pdf = renderer.RenderHtmlAsPdf("<h1>Happy New Year!</h1>")
pdf.SaveAs("executed_js.pdf")
