CD Actual Thematic 7: Programming/CDAT7.iso/Share/Java/ScriptBuilder/NOSB30_TRIAL.exe/data1.cab/Program_Files/CompLib/scrollbar.js

Text File | 1998-10-05 | 4.7 KB | 118 lines

function com_netobjects_scrollBarComponent( params ) {
    this.statusScroll = seStatusScroll;
    this.display = display;
    this.clearStatusBar = ssClearStatusBar;

    this.name = (params.name+"" != "undefined" && params.name+"" != "" && params.name != null ? params.name : "scrollBarComponent1");
   this.tooltip = (params.tooltip+"" != "undefined" && params.tooltip != null ? params.tooltip : "");
    this.updateDuration = (params.updateDuration+"" != "undefined" && params.updateDuration != null ? params.updateDuration : 10);
    this.scrollRate = (params.scrollRate+"" != "undefined" && params.scrollRate != null ? params.scrollRate : 1);
    this.scrollMsg = (params.scrollMsg+"" != "undefined" && params.scrollMsg != null ? params.scrollMsg : "");
    this.scrollWidth = (params.scrollWidth+"" != "undefined" && params.scrollWidth != null ? params.scrollWidth : 200);
    this.scrollNewWidth = (params.scrollWidth+"" != "undefined" && params.scrollWidth != null ? params.scrollWidth : 200);

    function display() {

        window.status = this.tooltip;
        setTimeout(this.name + '.display();',this.updateDuration*1000);
    }

       function ssClearStatusBar() {
        window.status="";
       }

    /* ======================================================================
    FUNCTION:    statusScroll

    INPUT:        msg (string): the string to be displayed in the status bar
                    width (integer): the number of spaces to appear between
                                            the left margin of the status bar and the
                                            message string, msg, when first displayed
                    rate (integer): the number of milliseconds between scrolling
                                    intervals

    RETURNS:        a handle to the timer;
                    null if invalid parameters were entered.

    DESC:            This function scrolls a user-defined message, msg, from right to
                    left in the browser's status bar.  The message is scrolled and
                    refreshed at every interval specified by the rate parameter.
                    Set the width parameter to determine how far from the left side
                    of the status bar to start the scrolling message.  The message
                    will then scroll that many spaces from right to left until being
                    "swallowed up" by the left margin, and repeat.

                    The following example shows how to generate a scrolling message
                    that will scroll 100 spaces from right to left, moving one
                    space every 50 milliseconds:

                    statusScroll("Welcome to my site!", 100, 50);

    PLATFORMS:    Netscape Navigator 3.01 or higher,
                    Microsoft Internet Explorer 3.02 or higher
    ====================================================================== */
    function seStatusScroll()
    {
        // Use the hidden 4th parameter to "save" the initial width during the multiple
        // iterations of the function.  If it's not specified, as is the case when called
        // for the first time by the user, initialize  it to the width param.
        var CWIDTH = this.scrollWidth;
         var width = this.scrollNewWidth;

        var ch = " ";
        var outputStr = "";
        var command = "";

        // Check validity of parameters
        if (this.scrollMsg+"" == "undefined" || this.scrollMsg == null)
            return null;
        if (width+"" == "undefined" || width == null)
            return null;
        if (this.scrollRate+"" == "undefined" || this.scrollRate == null)
            return null;

        // If the current width is greater than the initial width,
        // whittle it down.
        if (width > CWIDTH)
            width--;
        else if (width <= CWIDTH && width > 0) {
            // If the current width is less than the initial width,
            // but still greater than zero, the message is being
            // displayed between the status-bar boundaries.

            // Pad the msg string with spaces
            for (var i=0 ; i < width ; i++)
                outputStr+=" ";
            outputStr += this.scrollMsg;

            // Decrement the width to keep the string moving from right to left
            width--;
        }
        else if (width <= 0) {
            // If the width is less than zero, then the string is
            // being "swallowed up" but the left border of the
            // margin.  Execute the code to swallow up one character
            // at a time.
            if (-width < this.scrollMsg.length) {
                outputStr += this.scrollMsg.substring(-width, this.scrollMsg.length);
                width--;
            }
            else {
                outputStr = " ";
                width = CWIDTH;
            }
        } // end else if (width <= 0)

       window.status = outputStr;

        // Set the timer to call this function with the newly decremented width
        // parameter.  Continue to pass the msg and rate parameters.  Also pass
        // the CWIDTH parameter so the original width is always known.  This is
        // needed to continually loop through the sequence.
        this.scrollNewWidth = width;
        command = this.name + ".statusScroll()";
        scrollTimer = window.setTimeout(command, this.scrollRate*1000);
        return outputStr;

    }     // end statusScroll
}