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jquery.overlay.js
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jquery.overlay.js
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/*!
* jQuery.textoverlay.js
*
* Repository: https://github.com/yuku-t/jquery-textoverlay
* License: MIT
* Original Author: Yuku Takahashi
* Modifying Author: Niki Castle
*
* This version is from https://github.com/neekee/jquery-overlay/tree/master, which includes
* modifications made to get this working for input fields and resizeable textareas, and to
* allow nested matching.
*
*/
;(function ($) {
'use strict';
/**
* Get the styles of any element from property names.
*/
var getStyles = (function () {
var color;
color = $('<div></div>').css(['color']).color;
if (typeof color !== 'undefined') {
return function ($el, properties) {
return $el.css(properties);
};
} else { // for jQuery 1.8 or below
return function ($el, properties) {
var styles;
styles = {};
$.each(properties, function (i, property) {
styles[property] = $el.css(property);
});
return styles
};
}
})();
var entityMap = {
'&': '&',
'<': '<',
'>': '>',
'"': '"',
"'": ''',
'/': '/'
}
var entityRegexe = /[&<>"'\/]/g
/**
* Function for escaping strings to HTML interpolation.
*/
var escape = function (str) {
if (typeof str !== 'undefined'){
return str.replace(entityRegexe, function (match) {
return entityMap[match];
})
}
};
/**
* Determine if the array contains a given value.
*/
var include = function (array, value) {
var i, l;
if (array.indexOf) return array.indexOf(value) != -1;
for (i = 0, l = array.length; i < l; i++) {
if (array[i] === value) return true;
}
return false;
};
var Overlay = (function () {
var html, css, textareaToWrapper, textareaToOverlay, allowedProps;
html = {
wrapper: '<div class="textoverlay-wrapper"></div>',
overlay: '<div class="textoverlay"></div>'
};
css = {
wrapper: {
margin: 0,
padding: 0,
overflow: 'hidden'
},
overlay: {
position: 'absolute',
color: 'transparent',
'white-space': 'pre-wrap',
'word-wrap': 'break-word'
},
textarea: {
background: 'transparent',
position: 'relative',
outline: 0
}
};
// CSS properties transport from textarea to wrapper
textareaToWrapper = ['display'];
// CSS properties transport from textarea to overlay
textareaToOverlay = [
'margin-top',
'margin-right',
'margin-bottom',
'margin-left',
'padding-top',
'padding-right',
'padding-bottom',
'padding-left',
'font-family',
'font-weight',
'font-size',
'background-color'
];
function Overlay($textarea) {
var $wrapper, position;
// Setup wrapper element
position = $textarea.css('position');
if (position === 'static') position = 'relative';
$wrapper = $(html.wrapper).css(
$.extend({}, css.wrapper, getStyles($textarea, textareaToWrapper), {
position: position
})
);
// Setup overlay
this.textareaTop = parseInt($textarea.css('border-top-width'));
this.textareaLeft = parseInt($textarea.css('border-left-width'));
this.$el = $(html.overlay).css(
$.extend({}, css.overlay, getStyles($textarea, textareaToOverlay), {
top: this.textareaTop,
right: parseInt($textarea.css('border-right-width')),
bottom: parseInt($textarea.css('border-bottom-width')),
left: parseInt($textarea.css('border-left-width'))
})
);
// Setup textarea
this.$textarea = $textarea.css(css.textarea);
// Render wrapper and overlay
this.$textarea.wrap($wrapper).before(this.$el);
// Add styles that depend on which type of input field this is attached to
if ($textarea.is("input[type='text']")) {
$wrapper.addClass("with-input");
this.$el.css('white-space', 'nowrap');
if ($textarea.css('width') == "100%") {
$wrapper.css('width', "100%");
}
} else if ($textarea.is("textarea")) {
$wrapper.addClass("with-textarea");
$textarea.css('margin', 0);
$textarea.css('overflow-y', 'scroll');
this.$el.css('margin', 0);
}
// Intercept val method
// Note that jQuery.fn.val does not trigger any event.
this.$textarea.origVal = $textarea.val;
this.$textarea.val = $.proxy(this.val, this);
// Bind event handlers
this.$textarea.on({
'input.overlay': $.proxy(this.onInput, this),
'change.overlay': $.proxy(this.onInput, this),
'scroll.overlay': $.proxy(this.resizeOverlay, this),
'resize.overlay': $.proxy(this.resizeOverlay, this),
'keydown.overlay': $.proxy(this.resizeOverlay, this),
'keyup.overlay': $.proxy(this.resizeOverlay, this),
'focus.overlay': $.proxy(this.resizeOverlay, this),
'blur.overlay': $.proxy(this.resizeOverlay, this),
'click.overlay': $.proxy(this.resizeOverlay, this),
// These events should technically be covered by events above, but fixes issues where
// the events weren't firing correctly in different browsers. See each event for event and browser(s).
// See https://github.com/neekee/jquery-overlay/issues/5 for more information.
'wheel.overlay': $.proxy(this.resizeOverlay, this), // Overlaps with "scroll". Chrome, Opera
'DOMFocusOut.overlay': $.proxy(this.resizeOverlay, this) // Overlaps with "blur". Chrome, Opera, Safari
});
this.strategies = [];
}
$.extend(Overlay.prototype, {
val: function (value) {
return value == null ? this.$textarea.origVal() : this.setVal(value);
},
setVal: function (value) {
this.$textarea.origVal(value);
this.renderTextOnOverlay();
return this.$textarea;
},
onInput: function (e) {
this.renderTextOnOverlay();
this.resizeOverlay();
},
renderTextOnOverlay: function () {
var text, i, l, strategy, match, style;
text = $('<div></div>').text(this.$textarea.val());
// Apply all strategies
for (i = 0, l = this.strategies.length; i < l; i++) {
strategy = this.strategies[i];
match = strategy.match;
if ($.isArray(match)) {
match = $.map(match, function (str) {
return str.replace(/(\(|\)|\|)/g, '\\$1');
});
match = new RegExp('(' + match.join('|') + ')', 'g');
}
// Style attribute's string
style = 'background-color:' + strategy.css['background-color'];
// Set up highlighting
if (this.allowOverlapping) {
// Allow matching within an overlay that may already have been applied for another strategy
var textContent, prevIndex, str, html;
// Get the current html (including overlays added by previous strategies)
textContent = text.html();
html = '';
for (prevIndex = match.lastIndex = 0; prevIndex < textContent.length; prevIndex = match.lastIndex) {
// Get all matches
str = match.exec(textContent);
// If there are no messages, we're done with this strategy
if (!str) {
if (prevIndex) html += textContent.substr(prevIndex);
break;
}
// Apply an overlay to the first match
str = str[0];
html += textContent.substr(prevIndex, match.lastIndex - prevIndex - str.length);
html += '<span style="' + style + '">' + str + '</span>';
};
// Update the current html
if (prevIndex) text.html(html);
} else {
// Application of each strategy splits the string into individual nodes; consequent strategies are applied to each node
text.contents().each(function () {
var text, html, str, prevIndex;
if (this.nodeType != Node.TEXT_NODE) return;
text = this.textContent;
html = '';
for (prevIndex = match.lastIndex = 0; ; prevIndex = match.lastIndex) {
str = match.exec(text);
if (!str) {
if (prevIndex) html += escape(text.substr(prevIndex));
break;
}
str = str[0];
html += escape(text.substr(prevIndex, match.lastIndex - prevIndex - str.length));
html += '<span style="' + style + '">' + escape(str) + '</span>';
};
if (prevIndex) $(this).replaceWith(html);
});
}
}
this.$el.html(text.contents());
return this;
},
resizeOverlay: function () {
this.$el.css({ top: this.textareaTop - this.$textarea.scrollTop() });
this.$el.css({ left: this.textareaLeft - this.$textarea.scrollLeft() });
if (this.$textarea.is("textarea")) {
this.$el.css({ width: this.$textarea.width() - parseInt(this.$textarea.css('padding-left')) - parseInt(this.$textarea.css('padding-right')) });
this.$el.css({ 'padding-right': this.$textarea.width() - this.$el.width() + parseInt(this.$textarea.css('padding-right'))});
}
},
register: function (strategies, opts) {
strategies = $.isArray(strategies) ? strategies : [strategies];
this.strategies = this.strategies.concat(strategies);
if (this.allowOverlapping == null) {
this.allowOverlapping = opts.allowOverlapping;
}
return this.renderTextOnOverlay();
},
destroy: function () {
var $wrapper;
this.$textarea.off('.overlay');
$wrapper = this.$textarea.parent();
$wrapper.after(this.$textarea).remove();
this.$textarea.removeData('overlay');
this.$textarea = null;
}
});
return Overlay;
})();
$.fn.overlay = function (strategies, opts) {
var dataKey;
dataKey = 'overlay';
if (opts == null) {
opts = {};
}
if (strategies === 'destroy') {
return this.each(function () {
var overlay = $(this).data(dataKey);
if (overlay) { overlay.destroy(); }
});
}
return this.each(function () {
var $this, overlay;
$this = $(this);
overlay = $this.data(dataKey);
if (!overlay) {
overlay = new Overlay($this);
$this.data(dataKey, overlay);
}
overlay.register(strategies, opts);
});
};
})(window.jQuery);