Question

我有一个以下代码片段，它在OL 3.3和OL 4.9中提供了预期的结果。

当我将代码与我的OL4.9应用程序集成时，出于某种原因，我在Openlaszlo 4.9中将'parts'作为null。我无法弄清楚原因。以下代码是否正确？

OL3.3

<canvas>
<attribute name="result" />
<attribute name="dp" value="$once{new LzDatapointer()}" />
<handler name="onresult">
    _populateList();
</handler>
<method name="_populateList">
            var node = LzDataNode.stringToLzData(result);
            Debug.write('_populateList' , node);
            dp.setPointer(node);
            Debug.write('_populateList dp' , dp);
            var parts = dp.xpathQuery('tracker');
            Debug.write("parts::" , parts);
            var partsArray = new Array();
            if ( parts instanceof LzDataNode ) {
                partsArray[0] = parts;
            }
            else if ( parts instanceof Array ) {
                partsArray = parts;
            }           
</method>
<button name="sample">Click Me
<handler name="onclick"><![CDATA[
    canvas.setAttribute('result','<root><child1/><child2><sub/><sub/></child2><tracker sequence_number="1" next="NULL"/></root> ');
]]></handler>
</button>       
</canvas>

OL4.9

<canvas>
<attribute name="result" />
<attribute name="dp" value="$once{new lz.datapointer()}" />
<handler name="onresult">
    _populateList();
</handler>
<method name="_populateList" >
        var node = lz.DataElement.stringToLzData(result);
            Debug.write('_populateList' , node);
            dp.setPointer(node);
            Debug.write('_populateList dp' , dp);
            var parts = dp.xpathQuery('tracker');
            Debug.write("parts::" , parts);
            var partsArray = new Array();
            if ( parts instanceof lz.DataElement ) {
                partsArray[0] = parts;
            }
            else if ( parts instanceof Array ) {
                partsArray = parts;
            }           
</method>

<button name="sample">Click Me

<handler name="onclick"><![CDATA[
    canvas.setAttribute('result','<root><child1/><child2><sub/><sub/></child2><tracker sequence_number="1" next="NULL"/></root> ');
]]></handler>
</button>
</canvas>

Answer 1

这可能是4.9唯一的问题。我测试了flex4.6分支，这是我的输出。

flex4.6分支，swf11运行时：

_populateList «LzDataElement#0| <root><child1/><child2><sub/><sub/></child2><tracker sequence_number="1" next="NULL"/></root>» 
_populateList dp «<datapointer>#1| <root><child1/><child2><sub/><sub/></child2><tracker sequence_number="1" next="NULL"/></root>» 
parts:: «LzDataElement#2| <tracker sequence_number="1" next="NULL"/>»

flex4.6分支，DHTML运行时

_populateList «LzDataElement#0| <root><child1/><child2><sub/><sub/></child2><tracker sequence_number="1" next="NULL"/></root>»
_populateList dp «<datapointer>#1| <root><child1/><child2><sub/><sub/></child2><tracker sequence_number="1" next="NULL"/></root>»
parts:: «LzDataElement#2| <tracker sequence_number="1" next="NULL"/>»

您在4.9中看到的输出是什么？我没有在这里安装4.9进行测试。

OpenLaszlo DataPointer无法正常工作

1 个答案: