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POIs there a simple and efficent way to make JS works correctly with forms?
 

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  1. POIs there a simple and efficent way to make JS works correctly with forms?
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    <p>i asked a similar question yesterday and the answers were very clear so i thought that i understand the concept. This morning i set up a new HTML form and write a little javascript code snippet to make it work. But again nothing, i tried variuous implementation, but i get no response. i tried with the <code>action</code> attribute, i tried with the onclick, i looked on the references and everything look fine to me. I've just started studying programming, so i may missing something stupid, but i need help. </p> <p>here is my code:</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;title&gt;PROVA&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;form action="javascript: eseguiMedia();" &gt; Proponi un numero per ogni campo:&lt;br&gt; &lt;input type="text" id="numero1" &gt;&lt;br&gt; &lt;input type="text" id="numero2" &gt;&lt;br&gt; &lt;input type="text" id="numero3" &gt;&lt;br&gt; &lt;input type="submit" value="Submit" &gt; &lt;/form&gt; &lt;script type="text/javascript"&gt; function eseguiMedia() { var value1 = document.getElementsById("numero1").value; var value2 = document.getElementsById("numero2")value; var value3 = document.getElementsById("numero3").value; var average = Media(value1,value2,value3); average = Math.round(average * 100); average = average / 100; alert("La media di " + value1 + ", " + value2 + " and " + value3 + " \(rounded to two places\) è " + average + "."); } function Media(num1,num2,num3) { return ( (num1*1) + (num2*1) + (num3*1) ) / 3; } &lt;/script&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>i tried this different solutions:</p> <ul> <li>using the action attribute in this way action="javascript: eseguiMedia();"</li> <li>without the action, but with the onclick="eseguiMedia();" in the button. . with both of them.</li> </ul> <p>i would like to know what is the correct and always working way to invoke a function in a HTML form and pass to it the values. </p> <p>ps(i know jquery is better, but i need to use javascript in this exam) </p>
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    1. COThe traditional way to validate a form in JS is using the `onsubmit` property of the form ... http://www.w3schools.com/jsref/event_form_onsubmit.asp
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      1. POIs there a simple and efficent way to make JS works correctly with forms?
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    2. COty, but i tried also that way, but when i click on submit button nothing happen!
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      1. USciaoben
    3. COAt the very least there are two syntax errors: `document.getElementsById("numero2")value;` - you're missing a '.' between '(' and 'value'. `" \(rounded to two places\) è " ` '\' is the start of an escape sequence in a JS string, you need to do: `" \\(rounded to two places\\) è "` (or none at all if you just want the parenthesis)
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      1. POIs there a simple and efficent way to make JS works correctly with forms?
      1. USRobH
 

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