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[ticket/10741] Function to resize textarea elements

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New function to automatically resize textarea elements
as user types text

PHPBB3-10741
This commit is contained in:
Vjacheslav Trushkin 2013-04-09 18:38:59 +03:00
parent c25dfef770
commit 88072fd6c2
1 changed files with 85 additions and 0 deletions
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85
phpBB/assets/javascript/core.js
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@ -568,4 +568,89 @@ phpbb.addAjaxCallback('toggle_link', function() {
el.parent().attr('class', toggleClass);
});
/**
* Automatically resize textarea
*
* This function automatically resizes textarea elements when user
* types text.
*
* @param jQuery item jQuery object to resize
* @param object options Optional parameter that adjusts default
* configuration. See configuration variable
*/
phpbb.resizeTextArea = function(items) {
// Configuration
var configuration = {
minWindowHeight: 500, // Minimum browser window height when textareas are resized
minHeight: 200, // Minimum height of textarea
maxHeight: 500, // Maximum height of textarea
heightDiff: 200, // Minimum difference between window and textarea height
// In following callbacks parameter "item" is jQuery object. "this" points to DOM object
resizeCallback: function(item) { }, // Function to call after resizing textarea.
resetCallback: function(item) { } // Function to call when resize has been canceled
}
if (arguments.length > 1)
{
configuration = $.extend(configuration, arguments[1]);
}
function resetAutoResize(item)
{
var $item = $(item);
if ($item.hasClass('auto-resized'))
{
$(item).css('height', '').removeClass('auto-resized');
configuration.resetCallback.call(item, $item);
}
};
function autoResize(item)
{
function setHeight(height)
{
$item.css('height', height + 'px').addClass('auto-resized');
configuration.resizeCallback.call(item, $item);
}
var windowHeight = $(window).height();
if (windowHeight < configuration.minWindowHeight)
{
resetAutoResize(item);
return;
}
var maxHeight = Math.min(Math.max(windowHeight - configuration.heightDiff, configuration.minHeight), configuration.maxHeight),
$item = $(item),
height = parseInt($item.height()),
scrollHeight = (item.scrollHeight) ? item.scrollHeight : 0;
if (height > maxHeight)
{
setHeight(maxHeight);
}
else if (scrollHeight > (height + 5))
{
setHeight(Math.min(maxHeight, scrollHeight));
}
};
items.bind('focus change keyup', function() {
$(this).each(function() {
autoResize(this);
});
}).css('resize', 'none').change();
$(window).resize(function() {
items.each(function() {
if ($(this).hasClass('auto-resized'))
{
autoResize(this);
}
});
});
};
})(jQuery); // Avoid conflicts with other libraries