JavaScript Made Easy: Free JavaScripts Tutorials Example Code

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Body Calculator

I like this script because it uses some very ingenious JavaScripting techniques. into the process, it analyzses a persons information (sex, height, weight) and responds with a comment message.


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<SCRIPT LANGUAGE="JavaScript"> <!-- Original: Tomer and Yehuda Shiran <!-- Begin function getHeight(sex, age, height) { height = Math.round(height) var height5 = 0 var height50 = 0 if (age == 2) { height50 = 87 height5 = 82 } else if (age == 3) { height50 = 95 height5 = 90 } else if (age == 4) { height50 = 102 height5 = 95 } else if (age == 5) { height50 = 109 height5 = 101 } else if (age == 6) { height50 = 114 height5 = 107 } else if (age == 7) { height50 = 120 height5 = 112 } else if (age == 8) { height50 = 126 height5 = 118 } else if (age == 9) { height50 = 131 height5 = 121 } else if (age == 10) { height50 = 137 height5 = 127 } else if (age == 11) { height50 = 143 height5 = 131 } else if (sex == "f") { if (age == 12) { height50 = 150 height5 = 140 } else if (age == 13) { height50 = 157 height5 = 145 } else if (age == 14) { height50 = 160 height5 = 148 } else if (age == 15) { height50 = 162 height5 = 150 } else if (age == 16) { height50 = 162 height5 = 151 } else if (age == 17) { height50 = 163 height5 = 153 } else if (age == 18) { height50 = 164 height5 = 154 } } else if (age == 12) { height50 = 150 height5 = 137 } else if (age == 13) { height50 = 156 height5 = 142 } else if (age == 14) { height50 = 162 height5 = 148 } else if (age == 15) { height50 = 168 height5 = 155 } else if (age == 16) { height50 = 174 height5 = 160 } else if (age == 17) { height50 = 175 height5 = 165 } else if (age == 18) { height50 = 176 height5 = 165 } var percent = (height - height5) * (50 - 5) / (height50 - height5) + 5 return percent } function getWeight(sex, age, weight) { weight = Math.round(weight) var weight5 = 0 var weight50 = 0 if (age == 2) { weight50 = 12 weight5 = 10 } else if (age == 3) { weight50 =14 weight5 = 12 } else if (age == 4) { weight50 = 16 weight5 = 14 } else if (age == 5) { weight50 = 18 weight5 = 15 } else if (age == 6) { weight50 = 20 weight5 = 17 } else if (age == 7) { weight50 = 22 weight5 = 18 } else if (age == 8) { weight50 = 25 weight5 = 20 } else if (age == 9) { weight50 = 29 weight5 = 22 } else if (sex == "f") { if (age == 10) { weight50 = 32 weight5 = 25 } else if (age == 11) { weight50 = 37 weight5 = 27 } else if (age == 12) { weight50 = 41 weight5 = 30 } else if (age == 13) { weight50 = 46 weight5 = 34 } else if (age == 14) { weight50 = 50 weight5 = 38 } else if (age == 15) { weight50 = 53 weight5 = 40 } else if (age == 16) { weight50 = 56 weight5 = 43 } else if (age == 17) { weight50 = 57 weight5 = 45 } else if (age == 18) { weight50 = 57 weight5 = 46 } } else if (age == 10) { weight50 = 24 weight5 = 31 } else if (age == 11) { weight50 = 35 weight5 = 27 } else if (age == 12) { weight50 = 40 weight5 = 30 } else if (age == 13) { weight50 = 46 weight5 = 35 } else if (age == 14) { weight50 = 51 weight5 = 38 } else if (age == 15) { weight50 = 57 weight5 = 44 } else if (age == 16) { weight50 = 62 weight5 = 48 } else if (age == 17) { weight50 = 67 weight5 = 53 } else if (age == 18) { weight50 = 69 weight5 = 55 } var percent = (weight - weight5) * (50 - 5) / (weight50 - weight5) + 5 return percent } function printResult(height, weight, sex, age) { var heightAdj = "" var weightAdj = "" var ageAdj = "" var sexAdj = "" var gradeAdj = "" var grade = 0 var propWeight = weight / height if (height > 70) { heightAdj = "tall" grade += 2 } else if (height < 30) { heightAdj = "short" grade += 1 } else { heightAdj = "medium-height" grade += 3 } if (propWeight > 2) { weightAdj = "over-weight" grade += 1 } else if (propWeight < 0.5) { weightAdj = "slim" grade += 2 } else { weightAdj = "medium-weight" grade += 3 } ageAdj = ageInput + "-year old" if (grade >= 5) gradeAdj = "great-looking" else if (grade <= 2) gradeAdj = "ackward-looking" else gradeAdj = "fine-looking" sexAdj = (sex == "f") ? "female" : "male" var finalMessage = "You are a " + heightAdj + ", " finalMessage += weightAdj + ", " + gradeAdj + " " finalMessage += ageAdj + " " + sexAdj + "." alert(finalMessage) if (confirm("Are you interested in scientific results?")) { scMessage = "height = " + Math.round(height) scMessage +="%\rweight = " + Math.round(weight) scMessage += "%\rweight/height = " + propWeight alert(scMessage) } else if (grade <= 4) alert("Good idea!") var notice = "Thank you for using the JavaScript weight " notice += "and height calculator. All calculations are " notice += "done according to the child-development graph " notice += "in \"Compton's Encyclopedia\". We appologize " notice += "if you were insulted by the comments -- that " notice += "was not our intention. We used them to demonstrate " notice += "various JavaScript scripting techniques." alert(notice) } function convertInput() { weightInput = 0.45359 heightInput = 2.54 } var sex = prompt("Enter sex ((m)ale or (f)emale):", "") var ageInput = parseInt(prompt("Enter age in years (minimum = 2):", "")) ageInput = Math.round(ageInput) var systemMessage = "Whould you like to use the (m)etric system " systemMessage += "or the (e)nglish one?" var system = prompt(systemMessage, "m") var heightUnit = (system == "m") ? "centimeters" : "inches" var weightUnit = (system == "m") ? "kilograms" : "pounds" var heightInput = prompt("Enter height in " + heightUnit + ":", "") heightInput = parseInt(heightInput) var weightInput = prompt("Enter weight in " + weightUnit + ":", "") weightInput = parseInt(weightInput) if (system == "e") convertInput() if (ageInput > 18) var age = 18 else if (ageInput < 2) var age = 2 else var age = ageInput var heightPer = getHeight(sex, age, heightInput) var weightPer = getWeight(sex, age, weightInput) heightPer = (heightPer < 1) ? 1 : heightPer heightPer = (heightPer > 99) ? 99 : heightPer weightPer = (weightPer < 1) ? 1 : weightPer weightPer = (weightPer > 99) ? 99 : weightPer printResult(heightPer, weightPer, sex, age) // End --> </SCRIPT>

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