IE 10 does not re-apply padding on text-inputs - javascript

I have an IE 10 specific issue concerning text-inputs and padding that gives me a lot of headache. Here's a textual description of the setup and of what is happening but there is also a running example here:
https://jsfiddle.net/41nq3pt1/5/
I've omitted the CSS below, because it's a bit larger, please look at the JSFiddle. Help is really appreciated and I'm not only looking for a solution but also for an explanation why IE 10 is behaving weird.
Description
This is the HTML structure of my input element:
<div class="input">
<label class="input__label" for="input">Floating label</label>
<input class="input__input" type="text" id="input">
</div>
Initial State: In the initial state of the input field, there is an absolutely positioned label centered in the vertical middle of the input. This is done by giving it a padding-top. The padding of the input itself is adjusted so that the blinking cursor appears on the same height as the label.
Input has content: When typing something in the field, the label is moved upwards by reducing its padding-top while simultaneously increasing the input's padding-top to move it downward a little. Alternating the padding is done by adding a class via Javascript:
// jQuery 1.12.4
$('.input__input').on('keyup input', function() {
if (!$(this).val() || $(this).val() == "") {
$(this).closest('.input').removeClass('input--has-content');
} else {
$(this).closest('.input').addClass('input--has-content');
}
});
After deleting content: When the input is found to be empty, the class that alters the padding is removed and the input should be in its initial state. Now, despite working in all current browsers even down to IE 8 (I didn't test older versions), IE 10 apparently does not change the padding of the input element back, see this screenshot: IE 10 vs. other browsers after step 4.
Steps to reproduce
Click into the input field, see the cursor blinking on the same line as the label
Type something, the label should move upwards, the cursor moves slightly downwards
Remove every input by hitting backspace
The label moves down again and the cursor should blink on the same line as in step 1.
Thanks for any help!

Thanks to Marks comment, I experimented a bit with line-heights and eventually came to a solution that doesn't rely on line-heights but solves the problem by using a transparent border.
Solution: https://jsfiddle.net/41nq3pt1/16/
Instead of increasing the padding-top of the input when it has content, I set the height from 5rem to 4rem and give it a transparent border-top. This seems to work in all major browsers (tested in IE 9, 10, 11, Edge and the current Chrome, Firefox, Safari). Here is the important code block with annotations:
.input__input {
width: 15rem;
height: 5rem; // set a fixed height
padding-left: 1rem; // removed padding-top
font-size: 1rem;
font-family: inherit;
border: 0;
outline: 1px solid #ccc;
}
.input--has-content .input__input {
border-top: 1rem solid transparent; // replaced padding-top
height: 4rem; // keep total height at 5rem
}
I would still like to know why the original version didn't work in IE 10 but – oh well – I'm happy that I've found a fix that isn't too hacky.

Related

Is there a workaround for the IE11 table cell padding bug? [duplicate]

It seems I've stumbled on an annoying Internet Explorer 11 layout bug. (Ugh, I thought these days were behind us.)
In the following example, the padding on the right table cell disappears when you hover over it in IE11:
http://jsfiddle.net/xx4Z4/
This seems to arise because of an incredibly specific CSS scenario:
The element uses display: table-cell
The element uses percentage-based padding, e.g., padding: 0 5%
A subelement adds text-decoration: underline when the parent element is hovered over
If you change any of those three things, the problem goes away.
This seems to be an IE11 bug, but I'm wondering: Can anyone think of a workaround for this problem without abandoning display: table-cell and percentage-based padding?
Again a IE11 problem that seems so unusual. I see that the percentage padding is not even calculated and is not applied in the layout. However the text is still padded according to the padding percentage. So i would assume the text is positioned with the padding but after the positioning the percentage padding is "disabled".
I can't tell you why this happens. But if you really want to fix these you might want to use these quick fixes.
Use margin
Because the percentage bug only occurs on the padding of a table-cell, you can actually use a margin on the span itself.
span
{
margin-left: 10%;
}
and ofcourse reset the padding of the sides:
div.table-cell {
display: table-cell;
padding: 20px 0;
}
This "solution" is not as dynamic as with percentage padding on the table-cell itself.
Why not?
It's because the percentage takes is value from it's parent element, the table-cell. Where as the table-cell did take it's percentage value based on the tabel. Now when you would just use left-margin: 5%;. It would be half of the space as it should be. This is because it take the 10% on the table-cell width. Where the table-cell width is table width devided by its cells(table width / table cell).
So to fix that i did 5 times the amount of cells (5 * 2 in this case), which would result in the right percentage.
However this is not dynamic when you want to add more cells.
jsFiddle
Use border
Use border which its position is "reserved" before the padding is resetted.
Reserved border
span
{
border-bottom: 1px solid transparent;
}
Change property that doesn't need re-calculation of position; color
div.table-cell-bug:hover span
{
border-bottom-color: black;
}
Now note that there will still be no padding in the layout. As soon as a property is assigned which has not been calculated before the padding did reset(the same time the text position is determed) the positions will be re-calculated.
jsFiddle
I hope one of these quick fixes work for you.
I see you sended a bug report to MS. Keep us up-to-date when you get a reply, i would appreciate it :)
Strange, no one mentioned to set table-layout:fixed; It's really important, otherwise the padding/width won't be calculated correctly on IE (and some other weird side-effects, depending on the use case), especially when you are using images inside it.
<style>
.table { display:table; table-layout:fixed; }
.table-cell { display:table-cell; }
</style>
<div class="table">
<div class="table-cell"></div>
<div class="table-cell"></div>
<div class="table-cell"></div>
</div>
Adding invisible top and bottom borders seems to fix the problem.
a {
border: solid rgba(0,0,0,0);
border-width: thin 0;
}
This prevents the anchors from moving on hover or focus.
I use rgba(0,0,0,0) instead of transparent for better compatibility with old IE which displays transparent in colour while rgba is rendered invalid and not displayed at all.
We had a similar scenario where none of the solutions above worked.
Instead we animate the width of our affected div after the page has loaded:
if (!!navigator.userAgent.match(/Trident\/7\./)){
$("#karina-rosner2").animate({'width': '20.1%'},1);
$("#karina-rosner2").animate({'width': '20%'},1);
}
This forces IE11 to recalculate the div's relative padding value and solved our problem well.
This can be "helpfully" solved by setting the paddding css-rules like this ->
element:hover,
element:active,
element:focus {
// padding example
padding-left: 1.5%;
}
Rememeber to set this only for IE since it can make all normal browser behave like a disco.
EDIT: Flexbox works for IE 10 and above so this "solution" is only needed for ie 9 and below.
These are all really good answers, and the media query option works well to identify only IE which has this problem with display:table-cell
What I did that I found worked well was employ vertical-align as a great way to direct the text contained within the display:table-cell element to where I wanted it to reside. Usually vertical-align doesn't do much to formatting, UNLESS it is in a table.
Here is my simplified HTML:
<li id="table-cell-element">
<a href="#">
<img src="event.png"/>
<small>Register for Event</small>
</a>
</li>
And here is the CSS:
#media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {
li {vertical-align:middle; display:table-cell; width:15%; font-size:1.2em; line-height:1.2em; padding:2%; margin:0;}
li a {display:inline-block;}
li img {display:inline-block; vertical-align:middle; padding-right:5px; float:left; max-with:30px;}
small {display:block; font-size:60%; font-weight:bold; color:#333;}
}
You may also have to adjust the li a:hover {line-height} depending on what is in your CSS for those elements
Also, if you want this to work for IE 9 and below I suggest using conditional comments that add an "ie" class to the <html> tag and then create an IE9 style sheet. Thankfully the styling required for IE9 is relatively the same. But I only tested through IE9 and I am uncertain of your results for IE8 and IE7.

Unexpected behavior when trying to center element of dynamic width horizontally using outerWidth() and $(window).resize()

Edit 1 (reduced the problem to a jsfiddle):
I removed some unnecessary detail of the original problem.
I am trying to center a popup in the window. Because of how it will be used in the original context, the popup's width will be dynamic. Its only contents will be text, but it won't be known how long that text will be. In most cases it will fit on one line, but if the text is longer and the user has a lower screen resolution, it may need to occupy 2 lines, and I would like to keep all the text on the screen. The text is static in the jsfiddle, so that is obviously not what is causing the issue. I'm just clarifying in case anyone is wondering why I haven't tried setting a width for the popup. I'm using jquery to get the width using outerWidth() and $(window).resize() to trigger the centering function when the browser window is resized.
It works fine as long as the popup's width is smaller than the element containing it. I would like for the popup to just take the full width of its container if it is made small enough that the text has to go to two lines. As you will see in the video below, if you make a large adjustment in the browser window size, the width isn't always being reported correctly, which is causing the element to have a space on the left side instead of being centered. In other words, outerWidth() is reporting a width different than what is being rendered by the browser.
See this video for a demonstration of the problem: http://youtu.be/Tnq6nrrDKvw
This is happening for me in Firefox, Chrome, IE, Opera, and Safari. Perhaps it is a problem with jquery's outerWidth function. Or perhaps I don't understand something about how it is supposed to work. Is there another method to accomplish what I'm trying to do?
Here is the javascript, nothing too complicated:
function center_horizontally(id)
{
var windowWidth = document.documentElement.clientWidth;
var popupWidth = $(id).outerWidth();
var new_left = Math.max(0, windowWidth/2 - popupWidth / 2);
...
$(id).css('left', new_left + 'px');
}
$(function(){
$(window).resize(function() {
center_horizontally('#popup');
});
center_horizontally('#popup');
});
The only important css is that the popup has position: fixed and no set width or height. If I set the width of the popup, it sticks along the left side like it should, but the text extends beyond the right boundary. I would like to keep all the text on the screen and have it take the full width and jump some text down to the next line if needed. When the width gets low enough for that to happen, I just want the notice to occupy the entire width of the viewing area.
http://jsfiddle.net/dnag/qHjVG/5/
Edit 2 (the solution):
This is the solution I ended up using thanks to the help I got.
http://jsfiddle.net/dnag/qHjVG/44/
Instead of repositioning the popups, the popups are left with an auto width and display: inline-block. They are contained inside a div with fixed positioning. When the window is resized, the containing div is resized and repositioned. You can specify how much horiziontal space you want outside of the popups when the windows is reduced by changing the number in the function. There might be a way to do this with css only, but I'm just happy to have something functional at the moment.
So I might be misunderstanding but you don't need JS at all for this effect. This seems like a case of beating the sh!t out of something with a JS-hammer instead of using some CSS-fu. I've included two examples in my HTML below one with just a single line of text, one with more than that (3 lines when I plugged it into the fiddle)
I don't have a damn fiddle account so here is the pertinent pieces from your fiddle:
1) no JS needed. (especially not things like outerwidth et al which can cause unnecessary reflows/repaints.
2) HTML
<div id="popup">
This is some sample text, just a little bit of sample text.
</div>
<div id="popup" style="top:120px;">
This is some sample text, just a little bit of sample text.
This is some sample This is some sample text, just a little bit of sample text.
This is some sample This is some sample text, just a little bit of sample text.
This is some sample
</div>
3) CSS
#popup {
background: #FFF;
position: fixed;
top: 50px;
left: 0;
border: 1px solid #000;
box-shadow: 0 0 3px #CCC;
padding: 10px;
width:auto;
max-width:100%;
}
--EDIT-- ALT version centered like the top of the question implies:
HTML
<div id="popupWrapper">
<div id="popup">
This is some sample text, just a little bit of sample text. little bit
</div>
<div id="popup">
This is some sample text, just a little bit of sample text. little bit of s little bit of s little bit of s
</div>
<div id="popup" style="top:120px;">
This is some sample text, just a little bit of sample text.
This is some sample This is some sample text, just a little bit of sample text.
This is some sample This is some sample text, just a little bit of sample text.
This is some sample
</div>
</div>
CSS
#popupWrapper {
width: 100%;
text-align:center;
position:absolute;
}
#popup {
background: #FFF;
top: 50px;
border: 1px solid #000;
box-shadow: 0 0 3px #CCC;
padding: 10px;
max-width:100%;
display: inline-block;
}

textarea immitation is not working well. any replacements?

I have this html and css: http://jsfiddle.net/b7rDL/6/
HTML:
<div class="text-block" contenteditable="true" spellcheck="false">Some Text</div>
css:
.text-block {
resize: none;
font-size:40px;
border: none;
line-height: 1;
-moz-appearance: textfield-multiline;
-webkit-appearance: textarea;
min-width: 30px;
overflow: visible;
white-space: nowrap;
display: inline-block;
}
This code allows me to write text with no width limit or height limit. It displays no scroll bar and it grows with the text. Those are basically the features I need.
How can I convert this to regular textarea that will act the same? I want this to work on browser that doesn't implemented "contenteditable". Therefore I want to replace the div with textarea or other basiv element. How can I do it? (I don't mind using JavaScript).
How can I disable the spellchecker? spellcheck=false doesn't work. In the example, when I focus on the text box, I get that buggy red line. I am using Firefox.
How can I get rid of the border when I am focused? - SOLVED
I don't mind using JavaScript to solve those issues.
Any answer for those questions will help me.
Thanks
UPDATES:
#Oylex helped me with 3
#1
Working fiddle is here: http://jsfiddle.net/d9H9w/11/ (tested in IE8, Chrome and Firefox)
What you need is to set the width and height attributes as a user is typing within a text box.
Height
This is pretty straightforward:
Get the content of the textarea
Match for newline characters
Set the height to total number of newline characters(plus one for the first line and 1.5 for wiggle room) in em's.
Setting the height in em's makes this font-size agnostic, so it'll work with multiple font-sizes.
function getNewlines(){
// get the value(text) of the textarea
var content = textEl.value;
//use regex to find all the newline characters
var newLines = content.match(/\n/g);
// use the count of newlines(+1 for the first line + 1 for a buffer)
// to set the height of the textarea.
textEl.style.height = ((newLines && newLines.length || 0)+2.5)+'em';
};
Width
This is fairly easy, too, with one gotcha.
Get the content of the textarea
Split on newline characters to get an array consisting of lines of the textarea
Sort to get the longest line
Set the width to the length of the longest string in em's, multiplied by about .6(emRatio in my code), plus 2 ems for buffer space.
That last part is the kicker. The 'em' measurement is supposed to be a square representing the width and height that a single character takes up. This doesn't take kerning into account, so the height of a char is usually accurate, but the width is dependent on the chars around it. So, by guess and check, I figured that .6 em is about the average width of a character after kerning. .6 is pretty close, so I add 2 ems to the width for a bit of buffer space.
var emRatio = .6;
function longestLine(){
// get the value(text) of the textarea
var content = textEl.value;
// split on newline's. this creates an array, where each item in
// the array is the text of one line
var a = content.split('\n');
// use a sorting function to order the items in the array:
// longest string to shortest string
a.sort(function(a,b){return b.length - a.length});
// use the longest string * the emRatio to set the width
// Due to kerning, the letters aren't ever really 1em x 1em
// So I'm multiplying by an approximate ratio here (guess and check)
textEl.style.width = (a[0].length * emRatio + 2)+ 'em';
};
Existing problems with this implementation
To support resizing during long-held key presses, an onkeydown handler has to be included as well(this is not optimal for all cases that don't include long key presses)
All things considered, I think this fits what you need.
EDITS
Instead of having emRatio be .7, I changed it to .6 and added a buffer of 2 ems to the width. This addresses both issues #Naor mentioned in his comments.
I've updated the fiddle link and the Width section to reflect the changes.
EDIT 0
Request #1 Update
Working Solution: http://jsfiddle.net/7aeU2/
JQuery
$(function() {
// changes mouse cursor when highlighting loawer right of box
$("textarea").mousemove(function(e) {
var myPos = $(this).offset();
myPos.bottom = $(this).offset().top + $(this).outerHeight();
myPos.right = $(this).offset().left + $(this).outerWidth();
if (myPos.bottom > e.pageY && e.pageY > myPos.bottom - 16 && myPos.right > e.pageX && e.pageX > myPos.right - 16) {
$(this).css({ cursor: "nw-resize" });
}
else {
$(this).css({ cursor: "" });
}
})
// the following simple make the textbox "Auto-Expand" as it is typed in
.keyup(function(e) {
// the following will help the text expand as typing takes place
while($(this).outerHeight() < this.scrollHeight + parseFloat($(this).css("borderTopWidth")) + parseFloat($(this).css("borderBottomWidth"))) {
$(this).height($(this).height()+1);
};
});
});​
Request #2 Update
Also, here's a good explanation of why you can't outright disable spell check.
This does not belong to the realm of CSS (which is optional
presentational suggestions). It is not about stylistic features of
rendering data but about processing data interactively.
On browsers that support “spell checking” (which may involve grammar
and style checks), the HTML attribute spellcheck or the corresponding
IDL (DOM) attribute, settable in JavaScript, is effective.
In practice, those browsers tend to have “spelling checking” enabled
by default for textareas only, and as textareas normally contain human
language texts, turning it off does not sound useful. It is in any
case user-controllable (the user can switch it off or select
language).
via https://stackoverflow.com/a/9209791/1085891
Request #1
Simple Solution is pretty straight forward.
Working example: http://jsfiddle.net/b7rDL/12/
JQuery
$("#Solution0").keyup(function(e) {
while($(this).outerHeight() < this.scrollHeight) {
$(this).width($(this).width()+50);
};
});
HTML
<textarea id="Solution0" rows="1" style="height: 1.2em;"></textarea>
Fancier solution that will require some updating if you want the
width, rather than the height, to expand. Still, it's pretty nice.
http://jsfiddle.net/edelman/HrnHb/
https://github.com/ultimatedelman/autogrow
Other solutions - I know these all expand height. Let me know if you need width implementation of one of the below solutions.
http://bgrins.github.com/ExpandingTextareas/
http://blogs.sitepointstatic.com/examples/tech/textarea-expander/index.html
http://code.google.com/p/xautoresize-jquery/downloads/list
http://www.impressivewebs.com/textarea-auto-resize/
http://www.technoreply.com/autogrow-textarea-plugin-3-0/
Request #2
spellcheck="true" should work as described in the Mozilla docs: Controlling spell checking in HTML forms. It works for me in my first simple example running in Firefox 13.0.1. What version are you running?
for #3, the css option you are looking for is: outline: none;
I was having trouble figuring out the bounds of the textarea's content, so with this approach I'm copying the content of the textarea into a similarly styled p element, which is set to float: left; and then resizing the textarea based on the size of the p. This handles both width and height.
I've tested on Mac 10.8.1 FF 18.0, Safari 6.0, Chrome 25.0.1362.0 canary, iOS Safari 6.0.1 and iOS Simulator 5.1 (272.21). I don't have a PC or IE handy.
http://jsfiddle.net/b7rDL/34/
HTML
<textarea id="tx" class="text-block" spellcheck="false"></textarea>
<p id="dupe" class="text-block"></p>
CSS
.text-block {
font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
resize: none;
font-size:14px;
border: none;
line-height: 1;
min-width: 30px;
overflow: hidden;
white-space: pre;
display: block;
outline: none;
width: 30px;
height: auto;
border: 1px solid #ddd;
background-color: #f7f7f7;
}
#dupe {
float: left;
display: none;
width: auto;
height: auto;
}
I added a background and border so I could see what's going on.
JavaScript
// no `var` so they are global and easier to work
// with in the inspector when using jsFiddle
$tx = $('#tx');
$dupe = $('#dupe');
lineH = Number($tx.css('line-height').replace('px',''));
update();
$tx.on('keydown', function() {
setTimeout(update, 0);
});
$tx.on('propertychange input keyup change', update);
function update() {
$dupe.text($tx.val());
$tx.css({
width: $dupe.width() + 7,
height: $dupe.height() + lineH
});
}
// not sure if this is needed, leaving it because
// I don't have many browsers to test on
$tx.on('scroll', function() {
tx.scrollLeft = 0;
tx.scrollTop = 0;
});
I'm adding extra space on the right and at the bottom because it seems to perform more consistently that way. Also, in the HTML, the wrap="off" is necessary for the version of Firefox, I'm using.
I got some good tips from this blog post.
Request #2
Working Demo
<body spellcheck="false">
<div class="text-block" contenteditable="true">
Some Text SpellCheck</div>
Hi Naor, The only problem with this thing is it will disable the spellcheck for all the elements in the <body> tag. If it doesn't matter you then you can go with it.
Your question is really interesting and challenging really liked it. I hope this may help you..!!
Best efficient way which was worked for me while I did something very close in the past was creating hidden out of flow div with the same exactly styles as the textarea has. And than setting out the timeout to update its html source based on information from textarea. This sounds bit scary but yet, after some testing and playing around nothing was better, that was already suggested, so just my variant.
http://jsfiddle.net/f2gAD/16/
and jQuery based script:
var textarea = $('textarea'),
textBlock = $('div.text-block'),
interval, value, freq = 10,
doTextAreaAdjust = function(){
textarea.css({
height: textBlock.outerHeight(),
width: textBlock.outerWidth()
});
};
doTextAreaAdjust();
textarea
.focus(function(){
interval = window.setInterval(
function() {
value = textarea.val().replace(/(\r\n|\n|\r)/gm, '[rnnr]');
value = value.replace(/</gm, '||'); // break html tags
value = value.replace(/\[rnnr\]/gm, '<br>');
value = value + '|'; // or <span>|</span> for better pixel perfect
textBlock.html(value);
doTextAreaAdjust();
}, freq
);console.log(interval);
})
.blur(function(){
window.clearInterval(interval);
});
​
For performance wise did it as self starting/stopping timeout on focus/blur, though here is yet some workaround is required. While testing in Chrome noted that interval not properly stopped if you made blur by clicking on another tab. So probably replacement for self calling function into the setTimeout will be better.
It works more or less fine in IE 7-8 which suppose the main targets but still some text jumps time to time occur, while for others it is okay, but guess you will use editable feature for modern browsers. Would recommend use modernizer for its detection.
Working here
http://jsfiddle.net/H2GSx/
Code here:
HTML:
<div style="overflow: scroll; width: 200px; height: 100px;">
<div class="text-block" contenteditable="true" spellcheck="false">Some Text</div>
</div>​
CSS:
.text-block {
resize: none;
font-size:40px;
border: none;
line-height: 1;
-moz-appearance: textfield-multiline;
-webkit-appearance: textarea;
min-width: 30px;
overflow: visible;
white-space: nowrap;
display: inline-block;
}
​

Extremely strange behaviour with div height change in IE7 and IE8

I have a very simple HTML/JS code, which expands the size of a div on mouse over and collapses it again on mouse out. The code looks like this:
CSS:
.sign-in-up {
position: absolute;
left: 780px;
background-color: #8599b2;
font-size: 9pt;
line-height: 23px;
color:white;
text-align: center;
height: 25px; /* note this height 25px */
width: 164px;
overflow: hidden;
}
Then I have my div in HTML:
<div class="sign-in-up" id="sign-in-up"
onmouseover="$(this).css('height','55px')"
onmouseout= "$(this).css('height','25px')">
my html goes here
</div>
This works perfectly fine in Firefox (from version 3 and up), Safari, Chrome, Opera and IE9 - but does not work on IE8 or IE7. When I mouse-over the div, visually nothing changes. I tried changing the onmouseover to be
onmouseover="$(this).css('height','55px');alert($(this).height())"
and the alert box shows correct height of 55px, however visually on screen nothing changes and the div is still shown as 25px height.
I've tried every possible thing there is - with exactly the same results. It seems like IE is changing the height of the div in the dom but is not redrawing the div on the screen to match its new height.
At this stage I'm totally lost. Any help is greatly appreciated.
Edit
Thank you all that replied. After much head banging against the wall (computer screen in this case), the issue turned out to be caused by interference from curvycorners - a javascript library to imitate rounded corners (border radius) in older versions of IE. Once it did its job it would actively prevent redraws of the affected elements.
After removing rounded corners, everything works fine, although it looks worse - but at least it works. I'll investigate other options for rounded corners.
Thank you all that replied. After much head banging against the wall (computer screen in this case), the issue turned out to be caused by interference from curvycorners - a javascript library to imitate rounded corners (border radius) in older versions of IE. Once it did its job it would actively prevent redraws of the affected elements.
After removing rounded corners, everything works fine, although it looks worse - but at least it works. I'll investigate other options for rounded corners.
Have you tried to do
$(this).height(55)
instead of
$(this).css('height','55px')
it's actually working
http://jsbin.com/ebejew
I'd tend to go for a more CSS driven approach. This pulls out your presentation into CSS where it belongs.
#sign-in-up {
height:25px;
}
#sign-in-up.expanded {
height:55px;
}
Js
$(this).addClass('expanded');
$(this).removeClass('expanded');
Use this simple jQuery:
$(document).ready(function() {
$(".sign-in-up").hover(function() {
$(this).animate({
height: 55
}, 10);
}, function() {
$(this).animate({
height: 25
}, 10);
});
});​

JavaScript/HTML to alternate row colors for input type textarea?

Is there an easy way to have an HTML <textarea> alternate its row colors
to improve editing?
I don't mind if the solution is pure CSS or if it requires JavaScript.
textarea {
background-image: linear-gradient(#F1F1F1 50%, #F9F9F9 50%);
background-size: 100% 4rem;
border: 1px solid #CCC;
width: 100%;
height: 400px;
line-height: 2rem;
margin: 0 auto;
padding: 4px 8px;
}
Found this on codepen. Working for me.
If I understand correctly that you want the colors alternating WITHIN the textarea (as in each line)?
I would suggest the easiest method is to use a background image in your textarea's and have the rows of the alternate colors the same height as the font-size/line-height to create the illusion of alternate rows, then just repeat the background image.
Additional Solution
However, it seems that using that method, the background doesn't scroll along with each line.
The best technique I can come up with is to use a jQuery plugin called 'autoResize' by James Padolsey. What this does is removes the scrollbars and as your text nears the bottom of the textarea, the textarea height is increased accordingly.
Now, that can cause problems since you could potentially have VERY long textareas depending on how much text the user writes but I've created a fix for this.
What we can do is wrap the textarea in a div and set the overflow-y (vertical) to scroll and the overflow-x (horizontal) to hidden. What this does is now give us a "fake" scrollbar on our textarea, creating the illusion that it's scrollable so our background now appears as if it scrolls up and down with the text too.
You will have to adjust the width/height/margins/borders/paddings etc accordingly and maybe check for cross browser compatibility, but this should help set you on the right track and get you going.
Here is a link to an example I have created using the above method:
http://jsfiddle.net/HelloJoe/DmPLH/
CSS supports an nth child syntax now. Check out the MDN docs for an example of changing the background-color of only every other list item inside an unordered list:
HTML:
<p>NBA players with most championships:</p>
<ul>
<li>Bill Russell</li>
<li>Sam Jones</li>
<li>Tom Heinsohn</li>
<li>K. C. Jones</li>
<li>Satch Sanders</li>
<li>John Havlicek</li>
<li>Jim Loscutoff</li>
<li>Frank Ramsey</li>
<li>Robert Horry</li>
</ul>
CSS:
li:nth-child(even) {
background-color: lightyellow;
}
RESULT:
An example of making every other line in a textarea a different color by using CSS' nth-child syntax
SOURCE:
https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-child

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