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  • How much does Javascript garbage collection affect performance?

    - by Long Ouyang
    I'm writing a bunch of scripts that present images serially (e.g. 1 per second) and require the user to make either a keyboard or mouse response. I'm using closures to handle the timing of image presentation and user input. This causes garbage collection to happen pretty frequently and I'm wondering if that will affect the performance (viz. timing of image presentation).

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  • How do I get javascript-generated image maps to work with internet explorer?

    - by schwerwolf
    I'm using javascript to generate a high resolution grid for an image that I generated on a web server. The high-resolution grid is composed of a 'map' element with hundreds of 'area' child elements. Each 'area' element has onmouseover attribute that causes the display of a popup box. After assigning the map to the img (via the usemap attribute), Internet explorer ignores the 'onmouseover' attribute of the area elements that I added via javascript. The behavior is not caused by syntactical variations between IE and other browsers. A static map behaves correctly. Only the elements that I add dynamically to an existing image map fail to fire their corresponding mouse-over events. How can I get IE to fire the mouse-over event for the added 'area' elements? function generate_image_map ( img ) { var tile_width = 8; var tile_height = 10; var plotarea_left = 40; var plotarea_top = 45; var column_count = 100; var row_count = 120; var img_id = YAHOO.util.Dom.getAttribute(img, "id"); var img_map_id = YAHOO.util.Dom.getAttribute(img, "usemap"); var original_map = YAHOO.util.Selector.query(img_map_id)[0]; var area_nodes = YAHOO.util.Selector.query("area", original_map); var last_node = area_nodes[area_nodes.length - 1]; for (var y = 0; y < row_count; y++) { var top = Math.round(plotarea_top + (y * tile_height)); var bottom = Math.round(plotarea_top + (y * tile_height) + tile_height); for (var x = 0; x < column_count; x++) { var left = Math.round(plotarea_left + (x * tile_width)); var right = Math.round(plotarea_left + (x * tile_width) + tile_width); var area = document.createElement("area"); YAHOO.util.Dom.setAttribute(area, "shape", "rect"); YAHOO.util.Dom.setAttribute(area, "onmouseover", "alert('This does not appear in IE')" ); var coords = [ left, top, right, bottom ]; YAHOO.util.Dom.setAttribute(area, "coords", coords.join(",")); YAHOO.util.Dom.insertBefore(area, last_node); } } }

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  • Visual marker when moving rows on DataGridView

    - by BlueRaja
    Users drag rows up and down in my DataGridView. I have the dragging logic down-pat, but I'd like there to be a dark marker indicating where the row will be placed after I let go of the mouse. (I've seen this in 1000 places before, but can't seem to find an example right now) Does anyone know how I'd go about doing this? Is this built-in, or would I have to draw my own marker (if so, how do I do that)? Thanks!

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  • Google map - How to escape charaters in the title of a marker in a google map?

    - by Anthony
    Say have this piece of code: var marker = new google.maps.Marker({ position: location, title: 'B&#250;fals', map: map }); This creates a marker as expected but if I hover the mouse over it I don’t see 'Búfals' as I would expect (instead I see the html code). This doesn't make any difference: var marker = new google.maps.Marker({ position: location, title: unescape('B&#250;fals'), map: map }); Any ideas? Thanks.

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  • How to add a click event to a textbox created in code

    - by jvcoach23
    I'm using silverlight 3 and i'd like to create a handler and event wired up to a mouse click in a text box that was created in code behind. Can someone point me in the right direction. I need to make it so that some things fire off when that textbox is clicked into. if you have an example in vb.net that would be even better. thanks shannon

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  • One Common event for all controls in Silverlight

    - by Veejay
    I have a couple of textblock controls and all of them are calling a single event. But i have to wire all of them invidividually using TextBlock1.MouseMove += new MouseEventHandler(TextBlock_MouseMove); TextBlock2.MouseMove += new MouseEventHandler(TextBlock_MouseMove); TextBlock3.MouseMove += new MouseEventHandler(TextBlock_MouseMove); Is there a way that I can apply the mouse move to all TextBlock without wiring them one by one

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  • Highlight DIV and dim the rest on mouseover

    - by Darren Sweeney
    I have a page full of DIVs which contain images. When I mouse over an image I can highlight it or add a shadow to accent it easily by adding class etc but is there a way to dim every other image instead. DIVs are loaded into DOM and I would like the DIV currently hovered over to retain 100% or 1 opacity and the rest of the DIVs on the page to fade to say 70% or 0.7 when one DIV is highlighted. Is this possible?

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  • Many tooltips after upgrade to Eclipse 3.5

    - by javapowered
    I've upgraded to Eclipse 3.5 and now tooltips are displayed for everything - for any field, for any method, for anything. The worst thing is that they are displaying immediately after i've moved the mouse (no delay!) So almost always I do see some tooltip, this is very inconvenient. How can I either increase the delay or disable tooltips?

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  • Problem with button addition when double clicking a command label

    - by mistique
    Hy, I got an intersting problem which I stumbled upon. When I double click a label in a JLabel I want to add another button in a JPanel, its a shorter way to make a dragg and drop. The problem is that the button doesn't appears only if i'll position the mouse on the area the button should appear. Why does it happens this way? Anyone got a clue? Are there some thread related issues involved? Thanks in advance

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  • AS3: How to simplify Action Script 3 Code ?!

    - by funny_pete
    Here's a example that I've to use when I want to create a button with mouse-over effect: this.buttonExample.buttonMode = true; this.buttonExample.useHandCursor = true; this.buttonExample.addEventListener(MouseEvent.CLICK,myaction); I'm new to AS3 - is there any way, to simplify this code like this: this.buttonExample.buttonMode = true;.useHandCursor = true;.addEventListener(MouseEvent.CLICK,myaction); why does it not works ?

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  • How to do Automated UI testing for Flash

    - by Ran
    I have an actionscript 2 application that I'd like to write automated UI testing for. For example I'd like to simulate a mouse click on a button and validate that a movie-clip is displayed at the right position and in the right color... Basically, UI testing. What are the best tools available or what is the desired approach? In JavaScript there is the selenium framework which does a nice job. Any similar tool for flash?

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  • Any thoughts on how to create a true 'punch-out' area in a Sprite?

    - by rhtx
    I've been working on this for awhile, now. You might also call it a 'reverse mask', or an 'inverse mask'. Basically, I'm creating a view window within a display object. I need to allow objects on the stage that are under the window to be able to interact with the mouse. This is similar to a WPF question: http://stackoverflow.com/questions/740994/use-wpf-object-to-punch-hole-in-another, which has a much shorter write-up. I've got a Class called PunchOutShield, which creates a Sprite that covers the stage (or over some desired area). The Sprite's Graphics object is filled using the color and transparency of Flex's modal screen. The result is a screen that looks like the screen which appears behind a modal PopUp. PunchOutShield has a method called punch, which takes two arguments - the first is a Shape object, which defines the shape of the punch-through area; the second is a Point object, which indicates where to position the punch-through area. It took some experimenting, but I found that I can successfully create a punch-out area (i.e. - the modal screen does not display within the bounds of the given Shape). To do this, I set cacheAsBitmap to true on the Sprite that is used to create the modal screen, and also on the Shape object, which is added to the modal screen Sprite's displayList. If I set the blend mode of the Shape to ERASE, a completely transparent area is created in the modal screen. So far, great. The problem is that Shape does not subclass InteractiveObject, so there is no way to set mouseEnabled = false on it. And so, it prevents interaction between the mouse and any objects that are visible through the punch-out area. On top of that, InteractiveObject isn't available to look at, so I can't see if there is a way to borrow what it's doing to provide the mouseEnabled functionality and apply it to a subclass of Shape. I've tried using another Sprite object, rather than a Shape object, but the blending doesn't work out correctly. I'm not sure why there is a difference, but the Shape object seems to somehow combine with the parenting Sprite, allowing the ERASE blendMode to effect the desired punch-out visual appearance. It wouldn't be the end of the world if I had to draw up the screen with a series of rectangles so that the punch-out area was just simply not drawn, but that approach won't work if the punch-out area is complex. Or round. Any thoughts on this approach, or on an alternative approach?

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  • Emacs 23: Selection not highlighted

    - by phimuemue
    I installed Ubuntu 10.04, and with it came Emacs 23. If I want to select text in Emacs, that works perfectly fine except the fact that the region is not highlighted. However, this only happens, if I try to make a region using the keyboard. If I select something with the mouse, it is highlighted as usual. Does anybody know, why the region is not highlighted and how to fix that?

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  • Keyboard Shortcuts you use when your typing code.

    - by Sagistic
    People use a variety of little shortcuts that make typing code easier and without the hassle of going back to your mouse. For example, when deleting, ctrl + backspace will delete the whole word. I was wondering what types of little nifty tricks you know that you would like to share!

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  • jquery event handler- trigger function upon specific key and action

    - by Gal
    Background story: when a user selects a portion of text in a text field with her mouse (mark it up manually), and subsequently hits "alt" key, a certain function would trigger. My questions are: How can I trigger a function when a user hits a key (in her keyboard)? How can I preserve a portion of text selected, and use it as a parameter for that function? I've tried looking up online but haven't found any good answers, but i'd greatly appreciate links as well.

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  • How can I stop Flash from changing indent when user Clicks on hyperlink in TextField?

    - by Paul Chernoch
    I have a TextField which I initialize by setting htmlText. The text has anchor tags (hyperlinks). When a user clicks on the hyperlink, the indentation of the second and subsequent lines in the paragraph changes. Why? How do I stop it? My html has an image at the beginning of the line, followed by the tag, followed by more text. To style the hyper links to look blue always and underlined when the mouse is over them, I do this: var css:StyleSheet = new StyleSheet(); css.parseCSS("a {color: #0000FF;} a:hover {text-decoration: underline;}"); stepText.styleSheet = css; stepText.htmlText = textToUse; stepText.visible = true; Here is a fragment of the html text (with newlines and exrta whitespace added to improve readability - originally it was one long line): <textformat indent="-37" blockindent="37" > <img src="media/interface/level-1-bullets/solid-circle.png" align="left" hspace="8" vspace="1"/> American Dental Association. (n.d.). <i>Cleaning your teeth and gums (oral hygiene)</i>. Retrieved 11/24/08, from <a href="http://www.ada.org/public/topics/cleaning_faq.asp" target="_blank">http://www.ada.org/public/topics/cleaning_faq.asp </a> </textformat> <br/> As it turns out, the text field is of a width such that it wraps and the second line starts with "Retrieved 11/24/08". Clicking on the hyper link causes this particular line to be indented. Subsequent paragraphs are not affected. ASIDE: The image is a list bullet about 37 pixels wide. (I used images instead of li tags because Flash does not allow nested lists, so I faked it using a series of images with varying amounts of whitespace to simulate three levels of indentation.) IDEA: I was thinking of changing all hyperlinks to use "event:" as the URL protocol, which causes a TextEvent.LINK event to be triggered instead of following the link. Then I would have to open the browser in a second call. I could use this event handler to set the html text to itself, which might clear the problem. (When I switch pages in my application and then come back to the page, everything is OKAY again.) PROBLEM: If I use the "event:" protocol and user tries the right-mouse button click, they will get an error, or so I am told. (See http://www.blog.lessrain.com/as3-texteventlink-and-contextmenu-incompatibilities/ ) I do not like this trade-off.

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