Detect browser file input support [http://stackoverflow.com/questions/12479897/detect-browser-file-input-support]

gistfile1.js

function hasFileUploadSupport(){
  var hasSupport = true;
  try{
    var testFileInput = document.createElement('input');
    testFileInput.type = 'file';
    testFileInput.style.display = 'none';
    document.getElementsByTagName('body')[0].appendChild(testFileInput);
    if(testFileInput.disabled){
      hasSupport = false;
    }
  } catch(ex){
     hasSupport = false;
  } finally {
    if(testFileInput){
      testFileInput.parentNode.removeChild(testFileInput);
    }
  }
  return hasSupport;
}

alert(hasFileUploadSupport());