Interactive form (AcroForm) support

This is a tracking issue only, so this is not the place for any other questions or discussions. Open a new issue for that.

This is a meta issue for interactive form (AcroForm) support according to Chapter 12.7 of the PDF reference (http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/PDF32000_2008.pdf#G11.2110737). This includes all form elements except for signature fields, which are tracked in #1076. The objective is to get https://github.com/mozilla/pdf.js/blob/master/test/pdfs/f1040.pdf.link to render completely, but also to resolve other open issues and PRs.

General

• Prepare core and display layer for implementing form elements (#7596)
• Reference testing (#7602)
• Preference (#7602)
• Remove global PDFJS.renderInteractiveForms usage (#7640)
• Refactor field name construction code in WidgetAnnotation (#7775)
• Refactor or clarify where annotations are rendered
  • Mostly in the display layer, but text widget annotations with appearance streams are rendered in the core layer, which causes confusion…
• Appearances
• Storing entered values for when the page is destroyed when it is not visible
• Printing entered values
  • Either print the HTML elements or render the contents onto the canvas (use appendToOperatorList)
• Enable by default
• Update the example (#8030)
• Add Firefox pref to enable/disable forms (https://bugzilla.mozilla.org/show_bug.cgi?id=1652145)

Text widgets

• Rendering of single-line fields (#7602)
• Handle maximum length (#7622)
• Handle flags: multiline and read-only (#7633)
• Handle flags: comb (#7649)
• Handle justification (#7622)
• Sanitize maxLen and textAlignment in the core layer and unit tests for this (#7629)

Choice widgets

• Rendering of combo boxes (#7671)
• Rendering of list boxes (#7671)

Button widgets

• Rendering of pushbuttons (#9191)
• Rendering of checkboxes (#7898)
• Rendering of radio buttons (#7898)

[timvandermeij]

This is a tracking issue (refer to https://github.com/mozilla/pdf.js/issues/7613#issuecomment-251895091), so this is not the place for discussion or questions. Contact us on IRC in case of questions or file a separate issue if you found a bug. Thanks.

(I’m unlocking the conversation to be able to let users use the reaction button to measure the interest for this feature, but irrelevant comments will be removed.)

[timvandermeij]

Closing since AcroForm support is now done and enabled. The remaining issues are now filed in individual issues and collected with the 4-form-acroform tag; see https://github.com/mozilla/pdf.js/labels/4-form-acroform.