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Creating focus on element that's behind a different element

all. I'm a beginner trying to create my own website.
For an input field, I want the text to appear behind horizontal lines. To achieve this, I created a container div element with many sub divs each two pixels high with a bottom border of one pixel, then placed the container div in front of the input field.
The problem is that when hovering over the input field, the cursor only changes into the "text" style cursor in the small area at the very left edge of the input field not covered by the horizontal lines created by the sub div elements.
What I would like to happen, and I fear I may need Javascript, is to have the cursor, when hovering over the container div's horizontal lines, turn into the "text" cursor and when clicked for the focus to activate within the input field.
I hope my question isn't confusing. Thank you in advance.

Add this CSS to your div with horizontal lines:
pointer-events: none;
This indicates that your div element should not become the target of mouse events, effectively letting them "pass through" it.
For more information, see the MDN article on pointer-events.

Assuming that I'm understanding your question, you do need to use JavaScript. Using jQuery you can do the following:
$('.horizontalLines').click(function() {
$('.inputField').focus();
});
This just makes it so that clicking one div will select the text input box.

Hide part view text in overflow hidden

I making bookReader and one page will fit to user viewport. For this approach i make div
<div id="book">Long text...</div>
with
#book {
overflow: hidden
}
Then i provide to scroll this element only with buttons next and prev. When user click next button it will scroll like this
$('#next').on('click',function(){
$('#book').scrollTop($('#book').scrollTop() + $('#book').height());
});
But i have problem. That some times user will see part of text-line. How can i check every page is that last text-line is shown broken, and hide them if him is broken. I don't want to change content. I need a function that will check every page if that contains that part text and if this have that part text, hide him by making on the top element that should hide that.
DEMO: I show in red color what i need find and hide.
http://jsfiddle.net/lvivgeorge/jd7mum6c/3/
DEMO 2: It can contains anything (header tags, img, <code> , etc.)
http://jsfiddle.net/lvivgeorge/jd7mum6c/12/
P.S. Make all the same line-height is not solution. Change content styles is not solution too.

IMHO You should set fixed line-height of each text line, and set container height fixed as a multiple height of each textline. This should helps
Check this out: http://jsfiddle.net/jd7mum6c/5/

JavaScript (w/jQuery) - grow an element to fill container on hover, when surrounded by other elements

I have a grid of elements (3 x 3) formation which toggle visibility on hover, easy.
However my next step is to grow said elements to fill their container when hovered upon, I'm assuming I would need to get current (x,y) values and then grow this to the (x,y) values of the parent container and use css positioning, however every approach I take is hitting a brick wall. I have a fiddle here which demonstrates the layout / intended functionality - http://jsfiddle.net/u2w7J/
Any help would be gratefully appreciated!

The way your HTML is set up currently, this is kind of hard to accomplish while having it look smooth. A first try is to use the .toggleClass function and toggle "box" and "miniBox" for the hovered element. See http://jsfiddle.net/u2w7J/6/ for a demo.
Positioning is harder since the miniBoxes are not positioned absolutely. Hence, adding animation is causing weird results (see above demo).
I would suggest to have the miniBoxes positioned absolutely. When hovering, get the parents div left and top values and animate the miniBox using these values. Additionally, raise z-index during or before the animation to prevent other miniBoxes being visible.

How can I use this JQuery plugin to move an object X positions?

http://desandro.com/demo/masonry/docs/
I got this to display nicely. But,
How can I modify this plugin so that when someone clicks an object, it does the nice "re-ordering" effect as seen in: http://desandro.com/demo/masonry/docs/filtering.html#demo
And it moves the object "X" positions up or down the list?
Is it easy to modify this to do that?

From the moment that all elements has float:left; when the user click the button hide the element with specific classes, for example if he clicks grey, then will hide red and black. In jquery the above example would be like this:
$(document).ready(function(){
$("#grey-button").click(function(){
$(".red, .black").hide()
});
});
This will hide all elements with classes red and black, adding the css property display and value none.
This will make the browser don't "see" them, so the rest elements will be positioned in a different place, according the floats you have set for them.

Height of invisible objects, when they become visible, in javascript

I have a table that represents Tab-structure.
Some cells are set to display: none; and only the active tab is displayed.
I want to set the max-height to all of them.
To do it, I go through the array of tabs and do the following
// get the max-tab-height
for (var i = 0; i < TabPageList.length; i++)
{
// get max height
if (TabPageList[i].offsetHeight>MaxTabHeight)
MaxTabHeight = TabPageList[i].offsetHeight;
}
The problem with this approach is that offsetHeight is working only for the active tab that is displayed.
So, what's the Height of the ones that are not shown, when they will be shown?

Because the inactive tabs are set to display:none, the offsetHeight is not useful. Try running your MaxTabHeight routine at the same time that you activate the tab, after it is made visible. I'm assuming that's inside the tab's click event.

Try using visibility:hidden (not display:none). As I recall, using visibility elements are just hidden but keep their dimensions.

For usability, the tabs shouldn't be set to hidden with CSS. (There are still the small percentage out there that has js disabled). If you run through the tabs, reading their height, while hiding them, you can easily find the tallest tab. And at the same time make your site more user-friendly (:
And if you don't want the hidden cells to collapse, you could also use visibility:hidden; like stated above.

As the others have said you may get the height by setting the visibility to hidden (which makes the object keep its dimensions while hidden):
visibility:hidden;
with the additional trick of setting its position to absolute to avoid it taking space on the page (you may do this just for the time needed to get at the height, restoring its position attribute afterward).
A second approach may be to keep the tab visible but move it off the page by setting its absolute position to some sufficiently large coordinates.