backbase Read-time data refresh for listgrid

Read-time data refresh for listgrid.

刷新listgrid只需要调用其select-page方法就可以，实现实时刷新，可以在新线程中建立一个函数调用循环循环来调用b:listgrid的select-page方法。代码如下：

xml 代码

<!---->
   <b:listgrid id="movies-listgrid" b:template="listgrid.xsl" style="height:280px;" b:url="listgrid-data.xml" b:page-number="1" b:page-size="20" b:items-in-total="1000">
      <s:event b:on="command">
         <s:task b:action="alert" b:value="{'The event comes from row: ', (count($_mouseElement/ancestor::tr/preceding-sibling::tr) + 1)}"
        b:test="$_mouseElement/name()='input'" />
      <!---->s:event>
      <b:listgridhead>
         <b:listgridrow>
            <b:listgridheadcell b:datatype="text">Title<!---->b:listgridheadcell>
            <b:listgridheadcell b:datatype="text">Director<!---->b:listgridheadcell>
            <b:listgridheadcell b:datatype="genre">Genre<!---->b:listgridheadcell>
            <b:listgridheadcell b:datatype="text">Language<!---->b:listgridheadcell>
            <b:listgridheadcell b:datatype="datepicker" b:sorttype="string">Premiere<!---->b:listgridheadcell>
         <!---->b:listgridrow>
      <!---->b:listgridhead>
      <b:listgridbody />
   <!---->b:listgrid>
<!---->div>
<div>
    refresh every second
    <s:event b:on="command">
        <!---->>
        <s:task b:action="trigger" b:event="refresh-listgrid" b:async="true" />
    <!---->s:event>
    <s:event b:on="refresh-listgrid">
        <!---->
        <s:task b:action="trigger" b:event="select-page" b:target="id('movies-listgrid')"/>
        <!---->
        <s:task b:action="trigger" b:event="refresh-listgrid" b:delay="1000"/>
    <!---->s:event>
<!---->div>