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Improve type checking in ol.canvas.SUPPORTED

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This commit is contained in:
Tom Payne
2013-12-13 15:51:57 +01:00
parent 8f6952c56c
commit b39ae367e7
1 changed files with 16 additions and 12 deletions
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src/ol/canvas/canvas.js
+16 -12
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@@ -9,15 +9,19 @@ goog.require('goog.dom.TagName');
* @const * @const
* @type {boolean} * @type {boolean}
*/ */
ol.canvas.SUPPORTED = (function() { ol.canvas.SUPPORTED = (
if (!('HTMLCanvasElement' in goog.global)) { /**
return false; * @return {boolean} Canvas supported.
} */
try { function() {
var canvas = /** @type {HTMLCanvasElement} */ if (!('HTMLCanvasElement' in goog.global)) {
(goog.dom.createElement(goog.dom.TagName.CANVAS)); return false;
return !goog.isNull(canvas.getContext('2d')); }
} catch (e) { try {
return false; var canvas = /** @type {HTMLCanvasElement} */
} (goog.dom.createElement(goog.dom.TagName.CANVAS));
})(); return !goog.isNull(canvas.getContext('2d'));
} catch (e) {
return false;
}
})();