Question

js中实现代码说明：

function FindBlockAttrib()
{
    var winWidth = 440;
    var winHeight = 140;
    var winLeft = (screen.width - winWidth) / 2;
    var winTop = (screen.height - winHeight) / 2 - 20;

    var str = 'dialogHeight:' + winHeight + 'px;dialogWidth:' + winWidth + 'px;dialogTop:' + winTop + 'px;dialogLeft:' + winLeft + 'px;resizable:yes;center:yes;status:no;'

    var rt = window.showModalDialog("Gettext.htm?tmp=" + Math.random(), "输入属性文字", str);

    var txt;

    if (typeof (rt) == "undefined") {
        return;
    } else {
        var arr = rt.split(",");
        txt = arr[0];
    }

    var ss = mxOcx.NewSelectionSet();
    var spFilte = mxOcx.NewResbuf();

    // 把块对象，当着过滤条件.
    spFilte.AddStringEx("INSERT", 5020);

    // 得到图上，所有块对象.
    ss.Select2(5, null, null, null, spFilte);


    // 遍历每个块.
    for (var i = 0; i < ss.Count; i++) {
        var ent = ss.Item(i);
        if (ent == null)
            continue;
        if (ent.ObjectName == "McDbBlockReference") {
            var blkref = ent;
            var j = 0;
            for (; j < blkref.AttributeCount; j++) {
                var attrib = blkref.AttributeItem(j);
                if (attrib.TextString == txt) {
                    // 找到块属性。
                    mxOcx.PutEntityInView(ent.ObjectID, 300);

                    var dLen = mxOcx.ViewLongToDocCoord(80);

                    // 绘制一个标记圆.
                    mxOcx.DrawVectorCircle(ent.Position.x,
                ent.Position.y,
                 dLen, 65280);
                    return;
                }
            }
        }
        ent = null;
    }


    alert("没有找到块属性文字");



    // 在这里必须显示释放控件的COM对象指针.
    ss = null;
    spFilte = null;
    CollectGarbage();
}