asp net mvc barcode scanner About the Plug-in in Java

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About the Plug-in
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This plug-in creates an in-browser pop-up window that can be moved about by the user and also popped back down again It requires the following arguments:
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An object or object ID identifying the main container this may not be an array An object or object ID identifying the draggable header An object or object ID identifying the close button
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headerid closeid x & y
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The top left coordinates of the pop-up
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Figure 8-12 Creating an inbrowser pop-up window
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bounds type
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If true, the pop-up is forced to stay within the browser window, otherwise it may be moved off the edges The type of transition to use when popping the pop-up up or down, either fade , inflate , zoom , or instant
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w & h
If type is either inflate or zoom , w and h specify which dimension(s) will be modified, otherwise these values will be ignored
msecs The number of milliseconds a pop-up or pop-down should take (unless type is instant ) interruptible
If true, the pop-up can be interrupted by a pop-down call during its pop-up transition
Variables, Arrays, and Functions
browserw, browserh borderw, borderh popupw, popuph xoffset, yoffset x, y r, b Local variables containing the width and height of the browser Local variables containing the total widths of the left and right and top and bottom borders of the pop-up Local variables containing the width and height of the pop-up Local variables of the BWMove() subfunction containing the differences between the pop-up location and the current mouse positions Local variables of the DoBWMove() sub-subfunction containing the differences between the current and saved mouse positions Local variables of the DoBWMove() sub-subfunction containing the right and bottom maximum allowable coordinates for the pop-up if bounds is true Style property of closeid set to pointer when the mouse passes over it Event of id attached to the BWToFront() subfunction and event of closeid attached to the BWCloseWindow() subfunction Event of headerid attached to the BWMove() subfunction Global variables containing the coordinates of the mouse cursor Global variable set to true when the mouse button is down Global variable set to true when the mouse cursor is within the bounds of the browser Global variables containing the number of pixels the document has been scrolled in the horizontal and vertical directions Function to start repeated interrupts Function to stop repeated interrupts Function to return the maximum of two values Function to return the minimum of two values Plug-in to stop an event from occurring
cursor onclick onmousedown MOUSE_X, MOUSE_Y MOUSE_DOWN MOUSE_IN SCROLL_X, SCROLL_Y setInterval() clearInterval() Mathmax() Mathmin() PreventAction()
8:
Menus and Navigation
GoTo() PopUp() PopDown() BWToFront() BWCloseWindow() BWMove() DoBWMove()
Plug-in to move an object to a new location Plug-in to pop up a previously popped down object Plug-in to pop down and object Subfunction to bring a pop-up window to the front Subfunction to close a pop-up window Subfunction to prepare to move a pop-up when it is dragged Sub-subfunction to move a pop-up when it is dragged
How It Works
The first thing this plug-in does is move the pop-up to its correct location and initiate the pop-up process, like this:
GoTo(id, x, y) PopUp(id, type, w, h, msecs, interruptible)
Next, some local variables are assigned values to keep track of the browser s dimensions, the borders (if any) of the pop-up, and its width and height, as follows:
var browserw = GetWindowWidth() var browserh = GetWindowHeight() var borderw = NoPx(S(id)borderLeftWidth) + NoPx(S(id)borderRightWidth) var borderh = NoPx(S(id)borderTopWidth) + NoPx(S(id)borderBottomWidth) var popupw = W(id) var popuph = H(id)
The mouse cursor is then set to become a pointer when it passes over the closeid object, which is used as the close button After that, the BWToFront() subfunction is assigned to the onclick event of the pop-up so that whenever you click anywhere on the pop-up, if it is partially obscured by another, it is brought to the front In addition, the closeid object is assigned to the BWCloseWindow() subfunction so that clicking the close button will pop the window down, and the BWMove() subfunction is attached to the headerid object so that you can click and drag the header to move the pop-up about, like this:
S(closeid)cursor O(id)onclick O(closeid)onclick O(headerid)onmousedown = = = = 'pointer' BWToFront BWCloseWindow BWMove
The last couple of lines in the main setup section of code use the PreventAction() plug-in to disable the select event on the headerid and closeid objects If this is not done, dragging the pop-up quickly may highlight parts of the header text because the pop-up will drag behind the pointer This unsightly behavior is prevented like this:
PreventAction(headerid, 'select', true) PreventAction(closeid, 'select', true)
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