Javascript: Load an Image from url and display

Question

I want to preface this with the fact that I am very very new to JavaScript. I appreciate your patience with me.

I'm trying to create a script that allows a user to input a name into a text-area, press submit and an image is displayed based on that name.

I managed to come up with this:

<html>
<body>
<form>
<input type="text" value="" id="imagename">
<input type="button" onclick="window.location.href='http://webpage.com/images/'+document.getElementById('imagename').value +'.png'" value="GO">
</form>
</body>
</html>

Which almost does exactly what I need -loads an image around what a user inputs. But what I want is not for the image to open in a new window, or download to my computer - I want it to display on the page when clicked as an image like the example here.

I'm sure that my inexperience with Javascript is the main cause of my being unable to figure this out. The script above is as far as I can get without screwing things up. Any help is appreciated.

window.location.href is telling it to open in a new window. I suggest you use jQuery just like the example you saw. — dcodesmith, Jul 13 '13 at 20:44
Why not simply https://stackoverflow.com/a/63003728/1243247 ? — João Pimentel Ferreira, Jul 20 '20 at 21:03

adeneo · Accepted Answer · 2013-07-13T20:49:02.073

36

When the button is clicked, get the value of the input and use it to create an image element which is appended to the body (or anywhere else) :

<html>
<body>
<form>
    <input type="text" id="imagename" value="" />
    <input type="button" id="btn" value="GO" />
</form>
    <script type="text/javascript">
        document.getElementById('btn').onclick = function() {
            var val = document.getElementById('imagename').value,
                src = 'http://webpage.com/images/' + val +'.png',
                img = document.createElement('img');

            img.src = src;
            document.body.appendChild(img);
        }
    </script>
</body>
</html>

FIDDLE

the same in jQuery:

$('#btn').on('click', function() {
    var img = $('<img />', {src : 'http://webpage.com/images/' + $('#imagename').val() +'.png'});
    img.appendTo('body');
});

edited Jul 13 '13 at 20:49

answered Jul 13 '13 at 20:43

adeneo

312,895
29
395
388

1

This is exactly what I was after. Thank you. Now I just have to figure out how you did it. I understand what you've said, I just have to wrap my mind around a few more times before it sets. – user2579872 Jul 13 '13 at 20:53
I just gave the button an id, and attached an onclick handler, and in that handler, when the button is clicked, it gets the value of the text input, creates the URL, as you can see in the variables, and then creates an image element, sets the src property of the image to the URL, and appends that image to the body. It does however not remove the images, but that should be easy to figure out, or just ask another question. You're welcome BTW. – adeneo Jul 13 '13 at 21:00
Why not using jquery? It is so much more simple: https://stackoverflow.com/a/63003728/1243247 – João Pimentel Ferreira Jul 20 '20 at 21:03

score 5 · Answer 2 · answered Jul 13 '13 at 20:45

Are you after something like this:

 <html>
 <head>
    <title>Z Test</title>
 </head>
 <body>

<div id="img_home"></div>

<button onclick="addimage()" type="button">Add an image</button>

<script>
function addimage() {
    var img = new Image();
    img.src = "https://www.google.com/images/srpr/logo4w.png"
    img_home.appendChild(img);
}
</script>
</body>

mplungjan · Answer 3 · 2013-07-13T20:53:33.423

2

Add a div with ID imgDiv and make your script

 document.getElementById('imgDiv').innerHTML='<img src=\'http://webpage.com/images/'+document.getElementById('imagename').value +'.png\'>'

I tried to stay as close to your original as tp not overwhelm you with jQuery and such

edited Jul 13 '13 at 20:53

answered Jul 13 '13 at 20:46

mplungjan

169,008
28
173
236

score 1 · Answer 4 · answered Jul 13 '13 at 20:46

You have to right idea generating the url based off of the input value. The only issue is you are using window.location.href. Setting window.location.href changes the url of the current window. What you probably want to do is change the src attribute of an image.

<html>
<body>
<form>
  <input type="text" value="" id="imagename">
  <input type="button" onclick="var image = document.getElementById('the-image'); image.src='http://webpage.com/images/'+document.getElementById('imagename').value +'.png'" value="GO">
</form>
<img id="the-image">
</body>
</html>

An image without src attribute is not valid HTML. http://w3c.github.io/html/single-page.html#the-img-element However, it works as desired at least in Firefox. — Uwe Geuder, Aug 26 '17 at 22:59

score 1 · Answer 5 · answered Jul 13 '13 at 20:51

You were just missing an image tag to change the "src" attribute of:

    <html>
<body>
<form>
<input type="text" value="" id="imagename">
<input type="button" onclick="document.getElementById('img1').src =          'http://webpage.com/images/' + document.getElementById('imagename').value +'.png'"     value="GO">
<br/>
<img id="img1" src="defaultimage.png" />
</form>
</body>
</html>

score -3 · Answer 6 · answered Jul 13 '13 at 21:02

First, I strongly suggest to use a Library or Framework to do your Javascript. But just for something very very simple, or for the fun to learn, it is ok. (you can use jquery, underscore, knockoutjs, angular)

Second, it is not advised to bind directly to onclick, my first suggestion goes in that way too.

That's said What you need is to modify the src of a img in your page.

In the place where you want your image displayed, you should insert a img tag like this:

Next, you need to modify the onclick to update the src attribute. The easiest way I can think of is like his

onclick=""document.getElementById('image-placeholder').src = 'http://webpage.com/images/' + document.getElementById('imagename').value + '.png"

Then again, it is not the best way to do it, but it is a start. I recommend you to try jQuery and see how can you accomplish the same whitout using onclick (tip... check the section on jquery about events)

I did a simple fiddle as a example of your poblem using some google logos... type 4 o 3 in the box and you'll two images of different size. (sorry.. I have no time to search for better images as example)

http://jsfiddle.net/HsnSa/

Javascript: Load an Image from url and display

6 Answers6

Linked