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annotate source/examples/counters.js @ 194:2f10061fec29 javascript-exercises

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$ python py/remove_answers.py
author jf3243
date Mon, 21 Nov 2011 17:27:12 +0000
parents 5bec62c76e8b
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 (function()
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2 {
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4 var _create_fn = function(){};
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5 var create = function(parent){
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6
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7 _create_fn.prototype = parent;
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8 var instance = new _create_fn();
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9 return instance;
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10 };
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12 var global = (function(){return this;})();
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14 var counter = {}; // Prototype object for Counter.
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15
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16 var Counter = function(){
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18 var instance = create(counter);
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19 instance.__init__.apply(instance, arguments);
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20 return instance;
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21 };
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23 counter.__init__ = function(name){
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25 this.name = name;
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26 this.count = 0;
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27 };
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29 counter.onclick = function(event){
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31 this.count ++;
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32 };
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34 counter.html = function(parent_id){
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36 return this.name + ' ' + this.count;
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37 };
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39 global.onload = function(){
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41 var models = [
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42 Counter('apple'),
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43 Counter('banana'),
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44 Counter('cherry'),
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45 Counter('date')
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46 ];
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48 var element = document.getElementById('example');
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50 element.innerHTML = (
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51 '<span id="a0">apple 0</span>'
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52 + '<span id="a1">banana 0</span>'
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53 + '<span id="a2">cherry 0</span>'
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54 + '<span id="a3">date 0</span>'
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55 );
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57 element.onclick = onclick_factory(models);
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58 element = undefined; // Avoid IE memory leak.
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59 };
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61 var onclick_factory = function(models){
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63 var onclick = function(event){
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65 event = event || global.event; // For IE event handling.
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66 var target = event.target || event.srcElement;
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67 var id = target.id;
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68 if (id) {
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69 var id_num = +id.slice(1);
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70 var model = models[id_num];
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71 model.onclick();
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72 var html = model.html(id);
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73 if (html){
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74 document.getElementById(id).innerHTML = html;
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75 }
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76 }
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77 };
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78 return onclick;
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79 };
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81 })();
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