Develop Reference

Electron: cannot scroll to bottom of div

I'm trying to make a fake console using electron and I can't seem to be able to scroll on the bottom of the div containing the text, no matter what I try. I have used this code:
var d = $('#div1');
d.scrollTop(d.prop("scrollHeight"));
And plenty variants of the code above, both with jQuery and javascript. Do I have a problem because of electron? I just want to scroll to the bottom of the div.

This is how I fixed it.
http://lifesweeter21.blogspot.com/2015/02/how-to-scroll-top-or-bottom-of-document.html
Using this code:
function gobottom(){
var documentHeight=document.documentElement.offsetHeight;
var viewportHeight=window.innerHeight;
window.scrollTo(0,documentHeight-viewportHeight);
}

change start position of horizontal scrollbar without jquery

In Jquery I'm aware you can move the scrollbars' starting location. Is this possible with pure javascript? To clarify, when the user loads the page I simply want the horizontal scrollbar to start scrolled all the way to the right, instead of starting at the left. If there are cross-browser issues, I'm particularly concerned with this working in Chrome.

document.body.scrollLeft = ( divRef.scrollWidth - divRef.offsetWidth ) / 2 ;
NOTE:
This can give odd results with IE8 and earlier.

I've made an example with a div, you can easily adjust this to your body tag, or another div, please see the demo.
var a = document.getElementById('body');
console.log(a.clientWidth)
function moveWin(a) {
window.scrollTo(a.clientWidth,0);
}
moveWin(a)
DEMO
SIDENOTE:
To select the body, simply use
var a = document.getElementsByTagName('body')[0]

Test if element can be seen by the user on an html page

Is there any way to know if an element is visible on an html page?
Like this:
One can probably do it considering the horizontal/vertical scrolling positions, the width/height of the browser window and the position/size of the element on the page, but I have little experience in jQuery so I don't know how to do it. And there might be a simple function one can call, I don't know.

You can use the .is(':visible') selectors to check if an element is currently visible in the DOM.
Edit:
However, as #BenM mentioned, this doesn't check if the elements on your page are actually out of your scrollable range - a great little plugin you could use in that case would be Viewport Selectors for jQuery.

Here is some code that I use to do this. It has been tested to work great.
function isVisible($obj) {
var top = $(window).scrollTop();
var bottom = top + $(window).height();
var objTop = $obj.offset().top;
var objBottom = objTop + $obj.height();
if(objTop < bottom && objBottom > top) {
//some part of $obj is visible on the screen.
//does not consider left/right, only vertical.
}
}

enlarge image and move it with the pointer on mouse over

Sorry if this might seem trivial for me to ask but..
I have some images and I need them to enlarge when I hover my mouse over them. But.. I want for the enlarged image to stick next to the pointer as I move it across the image. I don't know what to call it. I'm pretty sure it's only done with javascript, just css won't work here.
Something like this http://www.dynamicdrive.com/style/csslibrary/item/css-popup-image-viewer/ , but you know, it has to move with the pointer in motion.
What's the most effective way to do this?

The previous answers may be exactly what you're looking for, and you may already have this solved. But I note that you didn't mention jquery anywhere in your post and all of those answers dealt with that. So for a pure JS solution...
I'll assume from the way the question was phrased that you already know how to pop the image up? This can be done by coding an absolutely positioned hidden img tag in the html or generated on the fly with JS. The former may be easier if you are a JS novice. In my examples I'll assume you did something similar to the following:
<img src="" id="bigImg" style="position:absolute; display:none; visibility:hidden;">
Then you need an onMouseOver function for your thumbnail. This function must do three things:
1) Load the actual image file into the hidden image
//I'll leave it up to you to get the right image in there.
document.getElementById('bigImg').src = xxxxxxxx;
2) Position the hidden image
//See below for what to put in place of the xxxx's here.
document.getElementById('bigImg').style.top = xxxxxxxx;
document.getElementById('bigImg').style.left = xxxxxxxx;
3) Make the hidden image appear
document.getElementById('bigImg').style.display = 'block';
document.getElementById('bigImg').style.visibility = 'visible';
Then you'll need to capture the onMouseMove event and update the now un-hidden image's position accordingly using the same code you would have used in (2) above to position the image. This would be something like the following:
//Get the mouse position on IE and standards compliant browsers.
if (!e) var e = window.event;
if (e.pageX || e.pageY) {
var curCursorX = e.pageX;
var curCursorY = e.pageY;
} else {
var curCursorX = e.clientX + document.body.scrollLeft;
var curCursorY = e.clientY + document.body.scrollTop;
}
document.getElementById('bigImg').style.top = curCursorY + 1;
document.getElementById('bigImg').style.left = curCursorX + 1;
And that should just about do it. Just add an onMouseOut event to hide the bigImg image again. You can change the "+1" in the last two lines to whatever you like to place the image correctly in relation to the cursor.
Note that all of the code above was for demonstration purposes only; I haven't tested any of it, but it should get you on the right track. You may want to expand upon this idea further by preLoading the larger images. You could also forgoe capturing mousemove events by using setTimeout to update the position every 20 ms or so, though I think that approach is more complicated and less desirable. I only mention it because some developers (including me when I started) have an aversion to JS event handling.
I did something similar to this with a custom ColdFusion tag I wrote that would generate a floating div users could click and drag around the screen. Same principle. If you need me to I can dig that out to answer any additional questions in more depth.
Good luck!

Liece's solution is close, but won't achieve the desired effect of the large image following the cursor.
Here's a solution in jQuery:
$(document).ready(function() {
$("img.small").hover (function () {
$("img.large").show();
}, function () {
$("img.large").hide();
});
$("img.small").mousemove(function(e) {
$("img.large").css("top",e.pageY + 5);
$("img.large").css("left",e.pageX + 5);
});
});
The HTML is:
<img class="small" src="fu.jpg">
<img class="large" src="bar.jpg">
CSS:
img { position: absolute; }

Try this links [jquery with auto positioning]
1.Simple
http://jquery.bassistance.de/tooltip/demo/
2.Good with forum
http://flowplayer.org/tools/tooltip/index.html

if I understood you correctly you want to position your big image relatively to the cursor. One solution in jquery (i'm not 100% sure of the code here but the logic is there):
$('.thumb').hover(function(e){
var relativeX = e.pageX - 100;
var relativeY = e.pageY - 100;
$(.image).css("top", relativeY);
$(.image).css("left", relativeX);
$(.image).show();
}, function(){
$(.image).hide();
})

Jquery is the easiest route. position absolute is key.

^ In addition to the above, here is a working JS Fiddle. Visit: jsfiddle.net/hdwZ8/1/
It has been roughly edited so it isnt using just overall IMG css tags, easy for anyone to use with this now.
I am using this script instead of a Lightbox in my Wordpress client site, a quick zoomed in image with mouse over is much nicer IMO. It is very easy to make efficient galleries especially with AdvancedCustomFields plug-in & in the WP PHP repeater loops!

Image Enlarger Script

I am looking for one of those scripts that when you click a Thumbnail, it makes the picture englarge. I tried searching Google using a lot of terms, but cant find any.
Where do I get these?

I believe one of these are what you are looking for.
http://leandrovieira.com/projects/jquery/lightbox/
http://jquery.com/demo/thickbox/

They're called lightboxes, if you search google again, I'm sure you'll find a lot.

i would use some very simple javascript:
your img tag in html file:
<img src="lala.alal" id="getbigger" onClick="grow()" />
your javascript:
function grow() {
width = document.getElementById('getbigger').width;
height = document.getElementById('getbigger').height;
width = width*[INSERT GROWTH RATIO HERE];
height = height*[INSERT GROWTH RATIO HERE];
document.getElementById('getbigger').height = height;
document.getElementById('getbigger').width = width;
}
of course you could just use jQuery animate tools
a good demo of jQuery animate with changing height and width is at this w3schools page.