Develop Reference

How to convert Html to image in asp.net

I want to convert my page into image, I have try html2canvas for convert HTML to image but is is not working for me because in my HTML some image load from other domain and cross domain image not load in canvas.
Thanks in advance.

I have used this one for a similar task and it works fine.

In my case i used this to convert HTML to image. You can try it out. It is available for FREE.
Hope it works...

Generating image preview of a doc or pdf file

Hey guys I have searched a lot but didnt get any working solution for this problem.
I am working on a site using jsp and on this we have to upload forms in doc / docx/ pdf format. I want to generate the preview of the first page of the form. So that user can checkout whats in the form before downloading it.
Hope someone will come up with some solution for this.
Thanks

Not sure what OS platform you are on for your jsp, but my recommendation would be to have a virtual printer driver that can "print" the document at hand to an image file (or as HTML). Then you can manipulate the output of the printer driver anyway you want. Extends itself nicely to other file formats as well.
Another version of this technique would be to programatically open the document with Microsoft Word (using ole automation), then do a screen capture after the document opens. Word can load PDF files as well. You'll have to find a creative way to get the document into a Windows desktop process from your server. But it could work.

Well.. what you can do is..
Hyperlink the form names with relative paths of your jsp with download option. You need to write a servlet to download the form.. preview this jsp in pop up window.
or
use iframes in html create a div tag to preview and download the same form you are displaying. You need to write a servlet to download the form.
Make sure you set the appropriate contentType of your forms doc/pdf/jsp using response.contentType("image/jpg");
response.contentType("application/pdf");
response.contentType("application/doc");

Use javascript to set image URL of image control in asp.net

I have a Image, FileUpload and a Button controls. I want to save the image to the server from the local path obtained from FileUpload control. I implemented this functionality on Button Click in C#..
Now i want to set the image URL of Image control OnClientClick of the same button on which server side code is implemented.
Image URL will defer everytime depending on file selected in FileUpload control. Can anyone help me to understand how javascript can be used to set image URL based on thre file selected in File Upload Control?

First of all, understand that JavaScript doesn't understand, care, or even know about C# and its fancy "controls". It just deals with HTML. Period. That said, you can use JavaScript's setAttribute function to set the image URL of an img tag (not control). Like this:
document.getElementById('my-image').setAttribute('src', 'http://ecx.images-amazon.com/images/I/41%2BjAZ4dUGL._SS500_.jpg');
Demo here:
http://jsfiddle.net/je9Gx/

You can use this code to find the image control, where imgid is ID of image control;
$("[id$='imgid']").attr("src",pathfromfileuploader);
//pathfromfileuploader=it is a variable which stores the path taken from file uploader;
Hope it will help :)

Control PDF using javascript in web browser

I want a frame with a PDF document. The main document will use javascript to tell the PDF document what page to display and zoom level. Can this be done? If so, how or could you point me to documentation on it. Thanks.

You can't/shouldn't do it in a frame, but you can create an <object> on your page that is controllable using the JavaScript API.
http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/js_api_reference.pdf

Not easily. It all depends on what's being used to display the PDF in the browser. Not all browsers have built-in PDF viewers, and then there's many different external viewers (e.g. Acrobat, Fox-It, etc...) as well. As far as I know, there's
You can try hacking up the URL like this:
http://example.com/somedocument.pdf#page=5
but this may work in Acrobat only, as documented here: http://partners.adobe.com/public/developer/en/acrobat/PDFOpenParameters.pdf

Do you need a PDF reader to be loaded and running? If not, you could write a back end script/program to render a specified page as an image (GIF, PNG, etc.) at a particular zoom level. Then your main page could load an image with something like:
<img src="render_pdf?page=4&zoom=150">
The src value could be controlled with javascript to make it dynamic.
To convert from PDF to an image in your render_pdf script, you can use ghostscript, or an image specific library like ImageMagick or GD, depending on what backend technology you are using.

Have a look at jsPDF - it may not output a .pdf onscreen in IE6 and IE7 due to limitations with datauri's, but its a good start. I dont see why this couldnt be built up in an iframe either.

As Jordan pointed out, you should use the <object> tag to embed the PDF. Then, in the PDF itself, you need to embed Javascript to handle the messages you pass in, such as:
if(!this.hostContainer.messageHandler) this.hostContainer.messageHandler = new Object();
this.hostContainer.messageHandler.onMessage = handleMessage;
function handleMessage(msg) {
// do stuff here
}
Finally, in your HTML JS, you pass messages in with:
document.getElementById('yourpdfobject').postMessage('some message or array');

Automatic image upload and display in a form

How to make the browser upload and display image after the user puts it in the file upload widget? I've got a form where an image should be uploaded and edited by the user on the fly (before they hit submit). Can I do it with Jquery?

Take a look at the JQuery MultiFileUpload plugin.

MultiFileUpload plugin should give you what you're looking for. It's important to remember that ajax does not support transferring binary files - you'll need an embedded IFrame to do the work for you.