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Thread: java script newbie.. please help.. just calculating stuff

  1. #1
    Join Date
    Nov 2008
    Posts
    3

    java script newbie.. please help.. just calculating stuff

    I'm trying to write a code for a BMR calculator thing and it's not working. I think it is the radio buttons.. they come out as undefined or something. thanks so much..

    <script type="text/javascript">
    function CalculateBMR(f)
    {
    var ele = f.elements;

    var weight = Number(ele.text1.value);
    var feet = Number(ele.text2.value);
    var inch = Number(ele.text3.value);
    var age = Number(ele.text4.value);
    var bmr;
    var sex = "";

    for (i = 0; i <2; i++) {
    if (ele.text5[i].value.checked) {
    sex = ele.text5[i].value;
    }
    }
    if(sex=="male"){
    bmr = 66+parseInt( 6.23*weight)+parseInt(12.7*(feet*12+parseInt(inch)))-parseInt( 6.8*age);

    } else if (sex=="female"){
    bmr = 655 + (4.35*weight)+(4.7*(feet*12+inch))-(4.7*age);
    }


    ele.text6.value = bmr;
    return true;
    }
    </script>


    <form>
    <table border="0">
    <tbody>
    <tr>
    <td align="left"><span style="text-decoration: underline;"><strong>Height</strong></span></td>
    </tr>
    <tr>
    <td align="left"><strong>Feet</strong>

    <input name="text2" size="3" type="text" /></td>
    <td align="right"><strong>Inch</strong>

    <input name="text3" size="3" type="text" /></td>
    </tr>
    <tr>
    <td align="left"><span style="text-decoration: underline;"><strong>Weight</strong></span></td>
    </tr>
    <tr>
    <td align="left"><input name="text1" size="4" type="text" /><strong>lb</strong></td>
    </tr>
    <tr>
    <td align="left"><input name="text4" size="4" type="text" /><strong>age</strong></td>
    </tr>
    <tr>
    <input type="radio" name="text5" value="male" /> Male
    <br />
    <input type="radio" name="text5" value="female" /> Female
    <br />
    </tr>
    <tr>
    <td colspan="2" align="left"><input onclick="return CalculateBMR(this.form)" type="button" value="Calculate" /></td>
    <td></td>
    </tr>
    <tr>
    <td align="left"><strong>BMR</strong>

    <input name="text6" size="5" type="text" /></td>
    </tr>
    </tbody></table>
    </form>

  2. #2
    Join Date
    Apr 2003
    Location
    Netherlands
    Posts
    21,654
    Code:
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
    <html lang="en">
    <head>
    <title>Calculate BMR</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    
    <script type="text/javascript">
    function CalculateBMR(f)
    {
    var ele = f.elements;
    
    var weight = Number(ele.text1.value);
    var feet = Number(ele.text2.value);
    var inch = Number(ele.text3.value);
    var age = Number(ele.text4.value);
    var bmr;
    var sex = (ele.text5[0].checked)? "male" : "female";
    
    if(sex=="male"){
    bmr = 66+parseInt( 6.23*weight)+parseInt(12.7*(feet*12+parseInt(inch)))-parseInt( 6.8*age);
    
    } else if (sex=="female"){
    bmr = 655 + (4.35*weight)+(4.7*(feet*12+inch))-(4.7*age);
    }
    
    
    ele.text6.value = bmr;
    return true;
    }
    </script>
    
    </head>
    <body>
    <form action="#">
    <table border="0">
    <tbody>
    <tr>
    <td><strong style="text-decoration: underline;">Height</strong></td>
    </tr>
    <tr>
    <td><strong>Feet</strong>
    
    <input name="text2" size="3" type="text">
    <strong>Inch</strong>
    
    <input name="text3" size="3" type="text"></td>
    </tr>
    <tr>
    <td><strong style="text-decoration: underline;">Weight</strong></td>
    </tr>
    <tr>
    <td><input name="text1" size="4" type="text"><strong>lb</strong></td>
    </tr>
    <tr>
    <td><input name="text4" size="4" type="text"><strong>age</strong></td>
    </tr>
    <tr>
    <td>
    <input type="radio" name="text5" value="male" checked> Male
    <br />
    <input type="radio" name="text5" value="female"> Female
    <br />
    </td>
    </tr>
    <tr>
    <td colspan="2"><input onclick="return CalculateBMR(this.form)" type="button" value="Calculate"></td>
    <td></td>
    </tr>
    <tr>
    <td><strong>BMR</strong>
    
    <input name="text6" size="5" type="text"></td>
    </tr>
    </tbody></table>
    </form> 
    </body>
    </html>
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