Web Page Error in javascript function

Question

Hi,

i am calling the below function from the button click in javascript

 

function print_page() {

alert('print_page');

// var ButtonControl = document.getElementById("btnprint");

// ButtonControl.style.visibility = "hidden";

// window.print();

}

<tr><td> <input type="button" id = "btnPrint" onclick="return print_page();" value="Print" /></td><%--window.print(); onclick="return print_page();"--%> 

 

 I am getting web page error as

Line:10 

'print_page' is undefined.

Pleaase help me how to rectify this 

Answer 1

Do you mean you want to convert the JPEG image to PNG while loading the JPEG image (and not after)?

Are you selecting and loading the JPEG image using the OpenFileDialog Class?

If yes, you can get the name of the JPEG file, pass it Image.FromFile method:
https://msdn.microsoft.com/en-us/library/system.drawing.image.fromfile.aspx
And then save it to PNG using the
Image.Save method (Stream, ImageFormat):
https://msdn.microsoft.com/en-us/library/ms142147.aspx

But if you face any problem while loading or saving the JPEG or PNG images, you can try using loading and saving features from leadtools programming toolkit.

Answer 2

Hi,

Please refer below URLs

http://stackoverflow.com/questions/17294737/converting-an-image-to-png-on-upload


http://stackoverflow.com/questions/3906260/how-can-i-convert-a-jpeg-image-to-a-png-one-with-transparent-background


http://www.c-sharpcorner.com/UploadFile/scottlysle/ImageConverter09132006105604AM/ImageConverter.aspx

Thanks