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Webmaster Forum / HTML, CSS, Scripts / JavaScript / March 2007About the DOM document object
In an if statement with "document.images" as it's expression, does it simply check if there are any image elements in an HTML page? I'm assuming if it finds any that the expression will return true and execute the statements within the if. if(document.images) { // various statements.... } Draenox@gmail.com wrote on 29 mrt 2007 in comp.lang.javascript: > In an if statement with "document.images" as it's expression, does it > simply check if there are any image elements in an HTML page? I'm [quoted text clipped - 5 lines] > // various statements.... >} No, not true, try: <script type='text/javascript'> if (document.images) alert(document.images); </script> This returns [object] even if there are no img elemants. (document.images) only equates to false if the object is not part of the DOM of that browser, or if no DOM exists [in a non browser environment, methinks].  SignatureEvertjan. The Netherlands. (Please change the x'es to dots in my emailaddress) Draenox@gmail.com said: >In an if statement with "document.images" as it's expression, does it >simply check if there are any image elements in an HTML page? I'm [quoted text clipped - 5 lines] > // various statements.... >} No, there don't have to be any images on the page for document.images to evaluate to true. The browser simply has to support images (and in some cases, images may have to be enabled). -- > Drae...@gmail.com said: > [quoted text clipped - 13 lines] > > -- You can call document.images.length and if it returns 0 then there are no images, if it returns >= 1 then there are. if (document.images.length > 0) { //do image stuff } else { //do no image stuff } > You can call document.images.length and if it returns 0 then there are > no images, if it returns >= 1 then there are. Are you sure about that ? Because i thought in case images are only included by css, ie. : myTag {background-image: url(<URL of an image>;} that kind of image isn't seen by document.images ??? SignatureUne Bévue On Mar 30, 9:11 am, unbewusst.s...@wortanschahung.com.invalid (Une Bévue) wrote: > > You can call document.images.length and if it returns 0 then there are > > no images, if it returns >= 1 then there are. [quoted text clipped - 8 lines] > -- > Une Bévue Maybe I'm weird, but I wouldn't expect them to. I would expect to get a array of <img> tags...the same as calling document.getElementsByTagName('IMG'). I was unaware that the OP was looking for something different. He said he was looking for image elements.... Tom Cole said the following on 3/30/2007 11:41 AM: > On Mar 30, 9:11 am, unbewusst.s...@wortanschahung.com.invalid (Une > Bévue) wrote: [quoted text clipped - 12 lines] > > Maybe I'm weird, but I wouldn't expect them to. It doesn't. > I would expect to get a array of <img> tags...the same as calling > document.getElementsByTagName('IMG'). Pretty much what it gives when you do something like: allImages = document.images; > I was unaware that the OP was looking for something different. He said > he was looking for image elements.... No, he was asking for clarification of what the posted code did. SignatureRandy Chance Favors The Prepared Mind comp.lang.javascript FAQ - http://jibbering.com/faq/index.html Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/ "Draenox@gmail.com" <Draenox@gmail.com> wrote in comp.lang.javascript: > In an if statement with "document.images" as it's expression, does it > simply check if there are any image elements in an HTML page? I'm [quoted text clipped - 5 lines] > // various statements.... > } Since the 'images' property is an array ("collection"?), I would guess that if you really wanted to find a condition in which there are images truly in the document, why not evaluate: if (document.images.length > 0) |
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