Question

在IE9中运行OpenLayers地图时，我得到“无法获取属性'displayClass'的值：对象为空或未定义”错误消息。

在查看问题后，看来Openlayers.js文件中的这一行是问题

this.controls=this.controls.concat(controls);
for(var i=0,len=controls.length;i<len;i++)
{var element=document.createElement("div");
element.className=controls[i].displayClass+"ItemInactive"; /* Problem here */
controls[i].panel_div=element;if(controls[i].title!="")
{controls[i].panel_div.title=controls[i].title;}

我的自定义工具栏的脚本是：

OpenLayers.Control.CustomNavToolbar = OpenLayers.Class(OpenLayers.Control.Panel,{
    initialize: function(options){
        OpenLayers.Control.Panel.prototype.initialize.apply(this, [options]);
        this.addControls([
            new OpenLayers.Control.Navigation({displayClass: 'olControlNavigation', zoomBoxEnabled:false}),
            new OpenLayers.Control.DrawFeature(vlayer, OpenLayers.Handler.Point, {displayClass: 'olControlDrawPoint'}),
            new OpenLayers.Control.DrawFeature(vlayer, OpenLayers.Handler.Path, {displayClass: 'olControlDrawPath'}),
            new OpenLayers.Control.DrawFeature(vlayer, OpenLayers.Handler.Polygon, {displayClass: 'olControlDrawPolygon'}),
            new OpenLayers.Control.ZoomBox({displayClass: 'olControlZoomBox', alwaysZoom:true}),
        ])
        this.displayClass = 'olControlCustomNavToolbar'
    },
    draw: function(){
        var div = OpenLayers.Control.Panel.prototype.draw.apply(this, arguments);
        this.defaultControl = this.controls[0];
        return div;
    }
});
var panel = new OpenLayers.Control.CustomNavToolbar({div:OpenLayers.Util.getElement('panel')});
map.addControl(panel);

使用CSS

    olControlCustomNavToolbar{
        float:left;
        right:0px;
        top:0px;
        width:160px;
        height:24px;
        margin:0px 6px 0px 0px;
    }   
    .olControlCustomNavToolbar div{
        float:right;
        height:24px;
        width:160px;
        margin:0px 0px 0px 6px;
    }
    .olControlCustomNavToolbar .olControlNavigationItemActive{
        width:24px !important;
        height:24px !important;
        margin:3px 0px 0px 6px !important;
        background-image: url("/OpenLayers-2.11/theme/default/img/pan_on.png")!important;
        background-repeat: no-repeat;
    }
    .olControlCustomNavToolbar .olControlNavigationItemInactive{
        width:24px !important;
        height:24px !important;
        margin:3px 0px 0px 6px !important;
        background-image: url("/OpenLayers-2.11/theme/default/img/pan_off.png")!important;
        background-repeat: no-repeat;
    }
    .olControlCustomNavToolbar .olControlDrawPointItemActive{
        width:24px !important;
        height:24px !important;
        margin:3px 0px 0px 6px !important;
        background-image: url("/OpenLayers-2.11/theme/default/img/draw_point_on.png")!important;
        background-repeat: no-repeat;
    }
    .olControlCustomNavToolbar .olControlDrawPointItemInactive{
        width:24px !important;
        height:24px !important;
        margin:3px 0px 0px 6px !important;
        background-image: url("/OpenLayers-2.11/theme/default/img/draw_point_off.png")!important;
        background-repeat: no-repeat;
    }
    .olControlCustomNavToolbar .olControlDrawPathItemActive{
        width:24px !important;
        height:24px !important;
        margin:3px 0px 0px 6px !important;
        background-image: url("/OpenLayers-2.11/theme/default/img/draw_line_on.png") !important;
        background-repeat: no-repeat;
    }
    .olControlCustomNavToolbar .olControlDrawPathItemInactive{
        width:24px !important;
        height:24px !important;
        margin:3px 0px 0px 6px !important;
        background-image: url("/OpenLayers-2.11/theme/default/img/draw_line_off.png") !important;
        background-repeat: no-repeat;
    }
    .olControlCustomNavToolbar .olControlDrawPolygonItemActive{
        width:24px !important;
        height:24px !important;
        margin:3px 0px 0px 6px !important;
        background-image: url("/OpenLayers-2.11/theme/default/img/draw_polygon_on.png") !important;
        background-repeat: no-repeat;
    }
    .olControlCustomNavToolbar .olControlDrawPolygonItemInactive{
        width:24px !important;
        height:24px !important;
        margin:3px 0px 0px 6px !important;
        background-image: url("/OpenLayers-2.11/theme/default/img/draw_polygon_off.png") !important;
        background-repeat: no-repeat;
    }
    .olControlCustomNavToolbar .olControlZoomBoxItemActive{
        width:24px !important;
        height:24px !important;
        margin:3px 0px 0px 6px !important;
        background-image: url("/OpenLayers-2.11/theme/default/img/drag-rectangle-off.png") !important;
        background-repeat: no-repeat;
    }
    .olControlCustomNavToolbar .olControlZoomBoxItemInactive{
        width:24px !important;
        height:24px !important;
        margin:3px 0px 0px 6px !important;
        background-image: url("/OpenLayers-2.11/theme/default/img/drag-rectangle-on.png") !important;
        background-repeat: no-repeat;
    }

有人能对我在这里做错了什么有所了解吗？谢谢

编辑： FYI这在Firefox，Chrome和Opera中运行良好。只有IE有这个问题。

编辑：抱歉，我犯了一个错误，我运行IE7兼容;在取下标签后重新措辞： meta http-equiv =“X-UA-Compatible”content =“IE = EmulateIE7”它在IE9中运行良好。

或者它不在IE7或IE8模式下工作，如果有人有任何想法仍然希望在IE7和IE8中使用它。谢谢，抱歉这个混乱。

Answer 1

在OpenLayers.Control.CustomNavToolbar类中，this.addControls参数数组有一个逗号。

Answer 2

如果使用的话，FYI IE9会死：

map.layers [J]。的原 .CLASS_NAME

请改用它，你没关系：

map.layers [j]的.CLASS_NAME

IE中的控制错误

2 个答案: