/*
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* NumberedTextarea - jQuery Plugin
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* Textarea with line numbering
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*
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* Copyright (c) 2015 Dariusz Arciszewski
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*
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* Requires: jQuery v2.0+
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*
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* Licensed under the GPL licenses:
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* http://www.gnu.org/licenses/gpl.html
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*/
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(function ($) {
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$.fn.numberedtextarea = function(options) {
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var settings = $.extend({
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color: null, // Font color
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borderColor: null, // Border color
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class: null, // Add class to the 'numberedtextarea-wrapper'
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allowTabChar: false, // If true Tab key creates indentation
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}, options);
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this.each(function() {
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if(this.nodeName.toLowerCase() !== "textarea") {
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console.log('This is not a <textarea>, so no way Jose...');
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return false;
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}
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addWrapper(this, settings);
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addLineNumbers(this, settings);
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if(settings.allowTabChar) {
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$(this).allowTabChar();
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}
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});
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return this;
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};
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$.fn.allowTabChar = function() {
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if (this.jquery) {
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this.each(function() {
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if (this.nodeType == 1) {
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var nodeName = this.nodeName.toLowerCase();
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if (nodeName == "textarea" || (nodeName == "input" && this.type == "text")) {
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allowTabChar(this);
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}
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}
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})
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}
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return this;
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}
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function addWrapper(element, settings) {
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var wrapper = $('<div class="numberedtextarea-wrapper"></div>').insertAfter(element);
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$(element).detach().appendTo(wrapper);
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}
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function addLineNumbers(element, settings) {
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element = $(element);
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var wrapper = element.parents('.numberedtextarea-wrapper');
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// Get textarea styles to implement it on line numbers div
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var paddingLeft = parseFloat(element.css('padding-left'));
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var paddingTop = parseFloat(element.css('padding-top'));
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var paddingBottom = parseFloat(element.css('padding-bottom'));
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var lineNumbers = $('<div class="numberedtextarea-line-numbers"></div>').insertAfter(element);
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element.css({
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paddingLeft: paddingLeft + lineNumbers.width() + 'px'
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}).on('input propertychange change keyup paste', function() {
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renderLineNumbers(element, settings);
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}).on('scroll', function() {
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scrollLineNumbers(element, settings);
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});
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lineNumbers.css({
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paddingLeft: paddingLeft + 'px',
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paddingTop: paddingTop + 'px',
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lineHeight: element.css('line-height'),
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fontFamily: element.css('font-family'),
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width: lineNumbers.width() - paddingLeft + 'px',
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});
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element.trigger('change');
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}
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function renderLineNumbers(element, settings) {
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element = $(element);
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var linesDiv = element.parent().find('.numberedtextarea-line-numbers');
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var count = element.val().split("\n").length;
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var paddingBottom = parseFloat(element.css('padding-bottom'));
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linesDiv.find('.numberedtextarea-number').remove();
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for(i = 1; i<=count; i++) {
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var line = $('<div class="numberedtextarea-number numberedtextarea-number-' + i + '">' + i + '</div>').appendTo(linesDiv);
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if(i === count) {
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line.css('margin-bottom', paddingBottom + 'px');
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}
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}
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}
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function scrollLineNumbers(element, settings) {
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element = $(element);
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var linesDiv = element.parent().find('.numberedtextarea-line-numbers');
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linesDiv.scrollTop(element.scrollTop());
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}
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function pasteIntoInput(el, text) {
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el.focus();
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if (typeof el.selectionStart == "number") {
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var val = el.value;
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var selStart = el.selectionStart;
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el.value = val.slice(0, selStart) + text + val.slice(el.selectionEnd);
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el.selectionEnd = el.selectionStart = selStart + text.length;
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} else if (typeof document.selection != "undefined") {
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var textRange = document.selection.createRange();
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textRange.text = text;
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textRange.collapse(false);
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textRange.select();
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}
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}
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function allowTabChar(el) {
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$(el).keydown(function(e) {
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if (e.which == 9) {
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pasteIntoInput(this, "\t");
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return false;
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}
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});
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// For Opera, which only allows suppression of keypress events, not keydown
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$(el).keypress(function(e) {
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if (e.which == 9) {
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return false;
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}
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});
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}
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}(jQuery));
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