1 | /* -------------------------------------------------------------------------- * |
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2 | * Experience Javascript Library (version 1.0b) |
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3 | * (c) 2007 Ahmed Saad <ahmeds@users.sourceforge.net> |
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4 | * |
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5 | * Experience is freely distributable under the terms of an MIT-style license. |
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6 | * For details, see project website at http://experience.sf.net |
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7 | * -------------------------------------------------------------------------- */ |
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8 | |
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9 | // Cloudy component |
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10 | |
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11 | experience.cloudy = { |
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12 | |
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13 | Version : '0.1', |
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14 | |
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15 | WeightedList : function (userParams){ |
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16 | |
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17 | this.Params = $H({ |
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18 | MinFontSize : 8, |
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19 | MaxFontSize : 40, |
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20 | Unit : "px", |
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21 | Items : null, // an array of items |
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22 | RenderIn: null, // an element or id |
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23 | ItemCSSClass: "cloudyItem", |
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24 | TipCSSClass: "cloudyTip" |
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25 | }); |
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26 | |
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27 | //// PUBLIC METHODS //////////////////////////////////////////////// |
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28 | |
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29 | this.render = experience.cloudy.render; |
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30 | |
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31 | //// INITIALIZATION /////////////////////////////////////////////// |
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32 | |
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33 | this.Params.merge(userParams); |
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34 | }, |
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35 | |
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36 | /** |
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37 | * Renders the weighted list inside an element (ie a <div>) |
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38 | * Parameters: |
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39 | * arr: A numerically indexed array of hash-like objects |
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40 | * representing items that has the following properties: |
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41 | * label: the label of the item (ie tag name) |
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42 | * weight: a number indicating item weight |
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43 | * href: where to link the item |
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44 | * html: (optional) a piece of html code (or just text) to |
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45 | * display when hovering over the item |
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46 | * handlers: (optional) an object-like hash of event names and |
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47 | * their handlers |
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48 | **/ |
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49 | |
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50 | render : function(){ |
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51 | |
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52 | if (this.Params.Items == null){ |
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53 | throw new Error ("No Items array was specified in the Items parameter"); |
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54 | } |
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55 | |
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56 | if (this.Params.RenderIn == null){ |
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57 | throw new Error ("No element (or id) was specified in the RenderIn parameter"); |
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58 | } |
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59 | |
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60 | var arr = this.Params.Items; |
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61 | var min, max, fix; |
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62 | |
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63 | for(var i = 0; i < arr.length; i++){ |
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64 | max = (arr[i]["weight"] > max || max == null)? arr[i]["weight"] : max; |
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65 | min = (arr[i]["weight"] < min || min == null)? arr[i]["weight"] : min; |
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66 | } |
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67 | |
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68 | var fix = max - min == 0? 1 : max - min; |
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69 | |
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70 | for(var i = 0; i < arr.length; i++){ |
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71 | var ratio = (1 - (max - arr[i]["weight"]) / fix); |
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72 | var fontSize = this.Params.MinFontSize + (ratio * (this.Params.MaxFontSize - this.Params.MinFontSize)) ; |
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73 | |
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74 | var a = document.createElement('a'); |
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75 | a.href = arr[i]['href']? arr[i]['href'] : '#' ; |
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76 | a.className = this.Params.ItemCSSClass; |
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77 | a.style.fontSize = fontSize + this.Params.Unit; |
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78 | a.innerHTML = arr[i]["label"]; |
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79 | |
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80 | if(typeof(arr[i]["html"]) != 'undefined'){ |
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81 | experience.Core.bindTip(a, arr[i]["html"], this.Params.TipCSSClass ); |
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82 | } |
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83 | |
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84 | if (arr[i]["handlers"]){ |
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85 | for(eventName in arr[i]["handlers"]){ |
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86 | Event.observe(a, eventName, arr[i]["handlers"][eventName]); |
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87 | } |
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88 | } |
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89 | |
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90 | $(this.Params.RenderIn).appendChild(a); |
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91 | $(this.Params.RenderIn).appendChild(document.createTextNode(' ')); |
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92 | } |
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93 | } |
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94 | } |
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95 | |
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96 | |
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