如何知道HTML5输入类型颜色是否可用作颜色选择器？

Question

如果没有显示颜色选择器,我想添加一个jquery颜色选择器后备.例如,chrome显示颜色选择器,但到目前为止,safari只显示一个文本字段.有没有办法(没有用户代理)检测颜色选择器是否可用？

编辑:Modernizr并不好,因为它只会说safari也支持它.Safari支持输入类型颜色,因为它不允许在输入框中输入#hex颜色.但是没有颜色选择器.我需要知道是否有颜色选择器.

Answer 1

干得好。

/**
 * Determine if the current browser has support for HTML5 input type of color.
 * @author Matthew Toledo
 * @return {boolean} True if color input type supported. False if not.
 */
var test = function() {
  var colorInput;

  // NOTE:
  //
  // If the browser is capable of displaying a color picker, it will sanitize the color value first. So "!"" becomes #000000;
  //
  // Taken directly from modernizr:
  // @see http://modernizr.com/docs/#features-html5
  //
  // These types can enable native datepickers, colorpickers, URL validation, and so on.
  // If a browser doesn’t support a given type, it will be rendered as a text field. Modernizr
  // cannot detect that date inputs create a datepicker, the color input create a colorpicker,
  // and so on—it will detect that the input values are sanitized based on the spec. In the
  // case of WebKit, we have received confirmation that sanitization will not be added without
  // the UI widgets being in place.
  colorInput = $('<input type="color" value="!" />')[0];
  return colorInput.type === 'color' && colorInput.value !== '!';
};

$(function(){
  if (test()) {
    $('body').append('<p1>Your browser supports the color input</p>');
  } else {
    $('body').append('<p>Your browser Doesn\'t Support the color input</p>');
  }
})

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>