vendor/assets/jquery/jquery.autogrowtextarea.js

   1 /*!
   2  * Autogrow Textarea Plugin Version v2.0
   3  * http://www.technoreply.com/autogrow-textarea-plugin-version-2-0
   4  *
   5  * Copyright 2011, Jevin O. Sewaruth
   6  *
   7  * Date: March 13, 2011
   8  */
   9 jQuery.fn.autoGrow = function(){
  10         return this.each(function(){
  11                 // Variables
  12                 var colsDefault = this.cols;
  13                 var rowsDefault = this.rows;
  14
  15                 //Functions
  16                 var grow = function() {
  17                         growByRef(this);
  18                 }
  19
  20                 var growByRef = function(obj) {
  21                         var linesCount = 0;
  22                         var lines = obj.value.split('\n');
  23
  24                         for (var i=lines.length-1; i>=0; --i)
  25                         {
  26                                 linesCount += Math.floor((lines[i].length / colsDefault) + 1);
  27                         }
  28
  29                         if (linesCount >= rowsDefault)
  30                                 obj.rows = linesCount + 1;
  31                         else
  32                                 obj.rows = rowsDefault;
  33                 }
  34
  35                 var characterWidth = function (obj){
  36                         var characterWidth = 0;
  37                         var temp1 = 0;
  38                         var temp2 = 0;
  39                         var tempCols = obj.cols;
  40
  41                         obj.cols = 1;
  42                         temp1 = obj.offsetWidth;
  43                         obj.cols = 2;
  44                         temp2 = obj.offsetWidth;
  45                         characterWidth = temp2 - temp1;
  46                         obj.cols = tempCols;
  47
  48                         return characterWidth;
  49                 }
  50
  51                 // Manipulations
  52                 this.style.width = "auto";
  53                 this.style.height = "auto";
  54                 this.style.overflow = "hidden";
  55                 this.style.width = ((characterWidth(this) * this.cols) + 6) + "px";
  56                 this.onkeyup = grow;
  57                 this.onfocus = grow;
  58                 this.onblur = grow;
  59                 growByRef(this);
  60         });
  61 };