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POCalculating investment values with javascript
 

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  1. POCalculating investment values with javascript
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    <p>I am currently learning javascript. I have created a calculator to find invesment future value. It is giving me an incorrect value when it displays the <code>future value</code>. I have checked the formula several times but it still gives me an error. Also, I have set alerts to appear if the interest is less than <code>0</code> or greater than <code>20</code> but nothing is showing. How would i be able to properly display the correct future value and alerts when necessary? <a href="http://webprolearner2346.zxq.net/calculator/future_value.html" rel="nofollow">Example</a></p> <p><strong>Javascript</strong></p> <pre><code>var $ = function (id) { return document.getElementById(id); } var calculate_click = function () { var investment = parseFloat( $("investment").value ); var annualRate = parseFloat( $("rate").value ) /100; var years = parseInt( $("years").value ); $("futureValue").value = ""; if (isNaN(investment) || investment &lt;= 0) { alert("Investment must be a valid number\nand greater than zero."); } else if(isNaN(annualRate) || annualRate &lt;= 0 || annualRate &gt; 20) { alert("Annual rate must be a valid number\nand less than or equal to 20."); } else if(isNaN(years) || years &lt;= 0 || years &gt; 50) { alert("Years must be a valid number\nand less than or equal to 50."); } else { //var monthlyRate = annualRate / 12; //var months = years * 12; var futureValue = 0; for ( i = 1; i &lt;= years; i++ ) { futureValue = ( futureValue + investment ) * ( 1 + annualRate ); } $("futureValue").value = futureValue.toFixed(2); } } var clear_click = function () { $("investment").value = ""; $("rate").value = ""; $("years").value = ""; $("futureValue").value = ""; } window.onload = function () { $("calculate").onclick = calculate_click; $("investment").focus(); $("clear").onclick = clear_click; } </code></pre>
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    1. COCan you please give example inputs and expected output along with the output you are getting?
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      1. POCalculating investment values with javascript
      1. USJon
    2. COOn a side note, I think you aren't checking the correct values for `annualRate`, as the first thing you do is divide by `100`, so you should be checking for `> .2`
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