I want to make document Viewer - documentation

I want to make a document viewer in Html page that views photo / txt / pdf ... and I want to edit it like to put icon on the document or make text highlight or put signature .. what is the best way ??

You can create your document viewer application using GroupDocs.Viewer API (available for .NET and Java). It supports viewing popular document types including TXT, PDFs, and images. In addition, you can use GroupDocs.Annotation and GroupDocs.Signature to annotate (highlight text) and sign the documents respectively.
Disclosure: I work as a developer evangelist at GroupDocs.

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Can you embed a separate pdf into Indesign and open it after exporting to PDF?

I would like to ask the following if possible. We have a client that wants a separate pdf document, embedded in a main pdf document and opens when you click it. Like the function in MS Word where you can attach another Word document inside a Word document (Word-ception, lol) and you can still open it.
I've tried it in Acrobat Pro with the Attachment and Link tools. Another option was to put the link document in an ftp server for accessibility. but our client really wants this functionality. Is this possible in Indesign?
Thank you!
Using Word as your example vehicle there are several ways to link 2 documents.
One is an appendix to the other, in PDF terms is a merge or binding but its one flowing document with separate sequential sections/chapters.
Another way is to link to an external file, in PDF terms a hyperlink to a relative second file, which can be locally folder relative or a web absolute reference. You have tried that.
In Word we can add objects internally with icons, in PDF that can be an annotation comment attachment to save externally and action accordingly. You also seem to discount that approach.
Finally PDF offers an Adobe Specific Structure where multiple PDFs attachments can be imbedded in an overall PDF wrapper. These are called Portfolios and not! to be confused with their portfolio service
They are unpopular since in a browser without Adobe Reader they should only offer the cover page.
Whilst in securer offline readers the files may well be shown as attachments that you need to save or independently open to view them.
Only some non Acrobat viewers may view them as a collection. And in the past that required runing insecure SWFlash, But I understand that has changed ?
Here is how the 3 internal PDF files seen above were shown in older Acrobat 9.
Possibly the best experience is using Foxit Reader

Is there a recommended workflow to automate producing PDF forms with embedded javascript?

We use a lot of PDF forms with embedded javascript. We generate PDFs from LibreOffice, then use Acrobat to add PDF controls and javascript. This isn't working well, because a change to the appearance of the form in LibreOffice then causes additional work in Acrobat to put the PDF controls back where they should be, and then re-do the javascript.
Is there a smart way to generate PDFs with the PDF controls built-in (text input boxes, check boxes, radio boxes, digital signature boxes), with all the javascript included in the source file?
For example, is there a tool that could convert an html form with embedded javascript into a PDF with the same javascript running in the PDF?
I have a two step process.
First, create the PDF using Adobe InDesign. InDesign can add PDF interactive PDF fields to your document so that when exported, the fields are present.
The second step is to use a script to add scripted actions to each field like this...
this.getField("foo").setAction("MouseUp", "app.beep(0);");
See the documentation for more actions.

How to get page coordinates inside pdf document onclick

Is there any API in js or .net or any other free tool through which page coordinates can be obtained in a pdf? Basically, I have a pdf file which contains images so I have read the coordinates on click inside the pdf document.
*coordinates here refer to .pdf page coordinates and not pixel coordinates, however I used itext library but couldn't figure out the solution.
In order to read the coordinates of an image when it's clicked on in the PDF, you're going to need to use a PDF viewer that is capable of running scripts. Unfortunately, there are only a few of those and they all implement only a portion of the Acrobat JavaScript API but the Acrobat JavaScript API can't tell you anything about images or their location so it's doubtful that any of the others would. However, you could create a plug-in to Reader and/or Acrobat and add that functionality but then all of your users would need to install both Acrobat/Reader and your plug-in.
Assuming I understood the user experience you are looking for, I don't think it's possible without a customized viewer.

Is there any file pdf version which allow for automatic(or manual) addition of http source of document?

Is there any pdf version which allow for automatic(or manual) addition of http source of document ?
Scenarion of this problem from user side looks like that :
I found disire document in pdf format on web.
I save it.
In a few months I open this document and I wish to find the web page where I've found it.
It would be nice to have somewhere address of that file, of course it could be manually written in soe text file, but usually there are problems with copy+paste of pdf documents titles.
If you can modify your PDF files before sending them to the browser, then there are several places where you could put the URL where the document came from:
You could use a node in the "logical structure" tree (chapter 14 part 7 of the PDF reference document). This tree will show up in Acrobat Reader in the "Model Tree" tab.
You could add a hyperlink annotation to the top or bottom of each page, or the first page, or in a new page that you can add at the beginning or at the end of the file. I personally think this is the best approach since the link will be click-able.
You could add a button field on a page that fires a GoTo action that is linked to the source URL. Actions are explained in chapter 12 - Interactive Features of the PDF reference document.
You could add a bookmark(outline) that points to a named destination that is linked to the source URL. Named Destinations are also explained in chapter 12. This approach can also be used with just one click, and it is possible to hide the bookmarks tab if we will not use it.
You could add it as a Document property as #Bobrovsky said.
PDF allows you to add custom values to document information dictionary (see 14.3.3, "Document Information Dictionary" in PDF Reference). You might put your URL there. Adobe Reader will show custom values in Document Properties dialog on the Advanced tab.
Starting from PDF 1.4 (Acrobat 5x and later) you might add URL to XMP Metadata stream referenced from document catalog (see 14.3 Metadata in PDF Reference). Adobe Reader will show metadata properties too if you put them in Custom scheme.
Acrobat Professional could be used to add custom values or XMP metadata. Almost any PDF library that can open and save PDFs could be used for the task too.
I think there is no other places in a PDF document that you can use to store your information.
PDF Reference

Is there any open source library for rendering doc, xls, ppt and pdf to html code?

I would like to write a "quick look" feature for my web application, that allow user "view" these kind of document on the web page, how can I do so? Thank you.
You could use OpenOffice which can open all of those formats. OpenOffice can also be used to convert a document to HTML. All that can be done through a Java API on the server (no GUI required).
I do not know how good the generated HTML is though, but it might be worth trying.
For PDF you will need an OpenOffice plugin that enables OpenOffice to open PDFs (for editing).
Check out the Crocodoc API. Crocodoc provides an HTML5 viewer (no Flash!) which you can embed in your web pages. It's free for non-commercial use.