Clever Geek Handbook

How can I check my Image object type?

If I write something like this:

var img = $(new Image()).attr('src', image.src);

How can I check later if the img var is an image and not something else?

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3 answers 


 if ( img.is('img') ){

 }

for safety. I might be tempted to re-include var in jQuery, just you can change img to dom node or whatever ...



if ( $(img).is('img') ){

}
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img.filter('img')


If it returns something, then it's an image.

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You should avoid explicit type checking.

Use polymorphism to choose what to do with images and what to do with other objects.

var img = $(new Image())(...);
img.process = function(){ ... do whatever images need ... };
objs.push( img );

var txt = new Text();
txt.process = function(){ .. do text processing, spellcheck, ... };
objs.push( txt );

...

objs.each( o ) { o.process(); }
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