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A client side JavaScript to be applied to a web page before the
page is rendered to PDF.
This kind of script can be used for a variety of purposes. For
example you might wish to hide background images or get pre-render
information from the document.
You can provide a return value by setting an "abcpdf"
property in the documentElement. For example:
document.documentElement.abcpdf = "my return value";
The return value can be accessed using the GetScriptReturn
method with the ID returned from Doc.AddImageUrl
or Doc.AddImageHtml.
For the MSHtml engine, you must have the UseScript
key set to true or you will get an "access denied" error; the return
value can only be set inside OnLoadScript.
The Gecko engine does not have these restrictions.
For the MSHtml engine, the script in this property is executed after
the page load is complete, so it may be executed before or after any
script in the web page that is executed after the completion of page load.
For the Gecko engine, the script in this property may be executed
before or after any event-triggered script in the web page. For example, if you set
window.ABCpdf_go to false in OnLoadScript, but the event listener that
sets window.ABCpdf_go to true is in the script in the web page,
you should check the value of window.ABCpdf_go (initially undefined)
before setting it to false in OnLoadScript.
doc.HtmlOptions.OnLoadScript = "if(!window.ABCpdf_go) window.ABCpdf_go = false;";
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