The function Page.render() will output a value of false

Currently, I am utilizing phantomjs to capture screenshots of multiple webpages. The code snippet below is what I have used to generate a screenshot image.

var page = require('webpage').create(); 
page.viewportSize = { width: 1200,height: 800};
page.open('http://<randomwebpageAddress>', function(status) {
  console.log(status);
  console.log(page.render('screenshot.png'));
  phantom.exit();
});

However, there are instances where the output for certain pages is as follows:

status = "success" but the return value of page.render() is false

This leads me to ask the following question:

Under what circumstances does page.render() return false?

Answer №1

Even though the documentation mentions that render() doesn't have a return type, it actually always returns a boolean indicating the success of the rendering process.

If the content is empty, as referenced in this link, the function will consistently return false, which shouldn't occur in normal circumstances.

Given that the render() function supports various output formats like PNG, JPG, GIF, and PDF, the returned value might vary slightly depending on the format used.

PDF

In reference to this source, a false return can only happen if there were errors in setting the format options.

GIF (pre v2)

Prior to version 2, a false result is only triggered when the designated file destination isn't writable, as mentioned in this reference.

JPG, PNG (and GIF)

The information obtained from this particular section reveals that the return value originates from QImage::save(), signaling a successful rendering and file writing process according to these lines of code.

Answer №2

According to the documentation, the result of the render() function is considered insignificant.

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