王学昌的笔记

安装openmeetings时需要

出现The entity name must immediately follow the '&' in the entity reference. Look for unescaped '&' characters in your source code的错误。

The entity name must immediately follow the '&' in the entity reference.

This message is complaining about an unescaped & character somewhere in your code. This can happen if you use the && operator in an attribute script, as in this example:

<div editme="if user.isLoggedIn && page.isScript"> ... </div>

For the scripted page to be valid XML, the && must be escaped like this:

<div editme="if user.isLoggedIn &amp;&amp; page.isScript"> ... </div>

tooltip.lzx内容如下：

<!---
      @topic Incubator
      @subtopic Tooltip
  -->
<library>

<include href="/tooltipview.lzx"/>
<!--- This class allows you to show a floating "tooltip" on any
    view.  To use it you make it a child of a view.  The parent view has
    to be clickable for the tooltip to work.  Setting clickable to false
    will disable the tooltip.
    
    For example:

    <example executable="false">
        &lt;button text="OK"&gt;
            &lt;tooltip&gt;This is a tip.&lt;/tooltip&gt;
        &lt;/button&gt;
    </example>

    The appearance of the tooltip is determined by a view on the canvas
    which must be named "tooltipview" and have a setText method and
    options="ignorelayout"
-->
<class name="tooltip" extends="node" initstage="late">
    <!--- text that appears in the tooltip.  null or empty string means tooltip will not show. -->
    <attribute name="text" type="text"/>
    <!--- @keywords private -->
    <attribute name="_mousein" value="false" type="boolean"/>
    <!--- @keywords private -->
    <attribute name="_checkdel" value="null"/>
    <!--- @keywords private -->
    <attribute name="_lastmousex" value="0"/>
    <!--- @keywords private -->
    <attribute name="_lastmousey" value="0"/>
    <!--- offset of tooltip from parent view-->
    <attribute name="p_yoffset" value="15"/>
    <!--- values = "'right',''" 
          attribute to align a tooltip 'right' so that it's right edge is flush 
          with it's parent's right edge ( minus 10 pixel inset ).   -->
    <attribute name="tipalign" value="" type="string"/>
    
    <!--- @keywords private -->
    <method event="oninit">
        this.overdel = new LzDelegate(this, "startCheck",parent,"onmouseover");
        this.outdel = new LzDelegate(this, "hideTip",parent,"onmouseout");
        this.outdel.register(parent, "onclick");
    </method>

    <!--- @keywords private -->
    <method name="startCheck">
        
        if (this.text != null &amp;&amp; this.text != "") {
            this._mousein = true;
            if (!this._checkdel) this._checkdel = new LzDelegate(this, "checkTip");
            this._lastmousex = canvas.getMouse('x');
            this._lastmousey = canvas.getMouse('y');
            this.lasttime = new Date();

            LzIdle.callOnIdle(this._checkdel);
        }
        
    </method>

    <!--- @keywords private -->
    <method name="checkTip">
        if (!this._mousein) return;
        var now = new Date();
        var newmousex = canvas.getMouse('x');
        var newmousey = canvas.getMouse('y');
        var timediff = now.getTime() - this.lasttime.getTime();

        if ((this._lastmousex != newmousex) || (this._lastmousey != newmousey)) {
            this._lastmousex = newmousex;
            this._lastmousey = newmousey;
            this.lasttime = now;
        }
        if (timediff > 500) {
            this.showTip();
        } else {
            LzIdle.callOnIdle(this._checkdel);
        }
    </method>

    <!--- @keywords private -->
    <method name="showTip"> 
        canvas.tooltipview.setText(this.text);
        
        var py = parent.getAttributeRelative( 'y', canvas )
        var tipy = this._lastmousey + 25;
        var tipx = canvas.width;
        if ( tipalign == 'right' ) {
            tipx = parent.getAttributeRelative( 'x', canvas ) + parent.width;
        }

        tipx = Math.min(tipx - canvas.tooltipview.width - 10, this._lastmousex - 5);

        var pointerontop = true;
        if (tipy > canvas.height - 30) {
          tipy = this._lastmousey - 25;
          pointerontop = false;
        }

        canvas.tooltipview.setX( tipx );
        canvas.tooltipview.setY( tipy );
        canvas.tooltipview.setPointerX( this._lastmousex, pointerontop );
        canvas.tooltipview.bringToFront( this.text );
        canvas.tooltipview.setVisible( true );
    </method>

    <!--- @keywords private -->
    <method name="hideTip">
        this._mousein = false;
        canvas.tooltipview.setVisible( false );
    </method>
</class>

</library>