html - Change background gradient color with Javascript -


i trying change background gradient color. code. browser reflects getcolor undefined.color1, color2 , color 3 inputs user. work still unable change background gradient color.

<script>     function getcolor(){         var color1 = document.getelementbyid('color1').value;         var color2 = document.getelementbyid('color2').value;         var color3 = document.getelementbyid('color3').value;         function getcssvalueprefix()             {                 var rtrnval = '';//default standard syntax                 var prefixes = ['-o-', '-ms-', '-moz-', '-webkit-'];                  // create temporary dom object testing                 var dom = document.createelement('div');                  (var = 0; < prefixes.length; i++)                 {                     // attempt set style                     dom.style.background = prefixes[i] + 'liner-gradient(#000000, #ffffff)';                      // detect if style set                     if (dom.style.background)                     {                         rtrnval = prefixes[i];                     }                 }                  dom = null;                 delete dom;                  return rtrnval;               }         document.getelementsbytagname("body")[0].style.background = getcssvalueprefix() + 'linear-gradient('+ '38deg' + ', ' + color1 + ', '+ color2  + ',' + color3 +')';      </script>

in html have button follows:

<button onclick="getcolor">change background color</button>

browser reflects getcolor undefined

the probable problem script not placed in window.onload. so, html onclick handler tries getcolor before it's loaded.

note: have liner-gradient in code. that's typo.


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