Download image/video in JavaScripting

[Anubh Jain]

HI ,

Is there any way we can download image and video in JS??

I tried google without any success.

Any pointers to that would alos be appreciated..

Thanks,
Anubhav

[Eric Pascarello]

What do you mean download it via JavaScript?

Eric

[Anubh Jain]

I might not be using proper terms(as i am new and unaware of those) .

I am creating a .js file where i need to download and save the image on my local pc using XMLHTTPREQUEST.

I hope I have made it a little clearer.

[Bear Bibeault]

No, JavaScript cannot write to the client system. Thank goodness!

You can create a link to the resource and the user will be prompted where to save the file.

[Anubh Jain]

Hi Bear,

So, can't I give the path where to download the file in the code itself(i.e. default download location)??

Can you please explain or provide a pointer to some tutorial on how to do this??
That will of great help.

Thanks

[Bear Bibeault]

Again, you can't. The user will choose where the file goes, not you.

[Anubh Jain]

Ok.

But how do I download the image after user has input the path to download?

Any pointers to that?

[Bear Bibeault]

All you do is create a link to the image. The browser handles the rest.

[Anubh Jain]

I guess you are assuming that the image is kept in the local storage.

But my problem is I want to download it from server to local storage ...and than load it in browser.

[Bear Bibeault]

Anubh Jain wrote:I guess you are assuming that the image is kept in the local storage.

I have no idea what you mean by "local storage". I'm assuming that it's on the server.

But my problem is I want to download it from server to local storage ...and than load it in browser.

Once again. Create a link to the image. The user can choose to download anywhere on their disk.

If you want it to automatically display the Save As dialog, you'll need to set the content-disposition header appropriately.

[Anubh Jain]

Ok.

So lets say i have created a link to image on server with URL "http://xyz"

Now using a XMLHTTPREQUEST object, how do i download the image and sisplay it on browser?

Any pointers to that?

[Tim Moores]

What does XMLHTTPREQUEST have to do with that? You would create an IMG tag in the page and points its SRC attribute to the image - done.

[Bear Bibeault]

Why would you want to do that? You can't really do much with image data returned from an Ajax response.

[Anubh Jain]

Well, seems I have to go through basic tutorials once again..

I would explain a little about my aim over here..

When my client starts, I want to download a image on my local memory from server along with other details as schedule for when the image is to be displayed.....

When the time given in schedule comes, it should display the image automatically.

I hope I have made it a little clear this time!!!

[Bear Bibeault]

Anubh Jain wrote:I hope I have made it a little clear this time!!!

Not really because you are not using standard terms.

When my client starts

What do you mean by this? What is "your client"? Are you writing a client program? Or do you just mean when you open the web page in a browser?

I want to download a image on my local memory

What is "local memory"? Do you mean your computer?

When the time given in schedule comes, it should display the image automatically.

How? In the browser? What if the user is watching YouTube videos at the time?

[Anubh Jain]

Let me just stick to my problem....

I have a URL of an image.

How do i download the image on my local memory(my PC) using XMLHTTPREQUEST?



That would fix my issue.

[Anubh Jain]

Lets say I have coded:

var xmlhttp = new XMLHttpRequest();
if(xmlhttp)
	{
		xmlhttp.onreadystatechange=function()
		{
                 if (xmlhttp.readyState==4 && xmlhttp.status==200)
			{
				xmlDoc = xmlhttp.responseText;//response is in binary format
                                //Some code to print this response in a file on my harddisk 
                         }
                  }
	xmlhttp.open("GET",cURL,false);  //cURL is the URL of image 
        xmlhttp.send() ;
} 

[Tim Moores]

Before you go any further, you really need to consider these two responses you already got:

Tim Moores wrote:What does XMLHTTPREQUEST have to do with that? You would create an IMG tag in the page and points its SRC attribute to the image - done.

Bear Bibeault wrote:Why would you want to do that? You can't really do much with image data returned from an Ajax response.

[Anubh Jain]

Ok..lets get it this way....



I have an emulator ...which is switched on for all time......
The emulator will connect to server once a day and will download the schedule and data(image/video) to be played at that schedule.

I have downloaded the schedule...but I am unable to download the data(image/video). How do I download this...

[Tim Moores]

Start reading here: http://www.techrepublic.com/article/preloading-and-the-javascript-image-object/5214317

[Anubh Jain]

I went through the link above.....but still I was unable to find what I needed.

How do I write binary data received from server in a file on my local Harddisk?

[Tim Moores]

Not following. You asked about loading images into a web page for the purpose of showing them later; that's what the article is about.

As has been mentioned before, a web page can't download content on its own to the user's disk without the user getting involved, and that's a good thing.

I'm getting the impression, though, the the client you're talking is not really a browser...? In that case you should tell us what kind of client, exactly, this is.

[Anubh Jain]

Ya..it is not a browser....

It is a TV SDK....

Is it possible to call a function of some other language (c/c++/java or any other porogramming language which can download the image) from javascript?

[Bear Bibeault]

Do you not think that was pertinent information to include on your very first post?

[Anubh Jain]

Appologies for that...

I thought I would have functioned the same way as the browser...but it turned out different...

Sry for that again....

Do you have any solution for this??