我相信没有一个直接的方法所以。虽然使用两个ajax请求不太漂亮，但您可以至少达到预期的结果。

您的datatable渲染的每一行（tr）都有一个名为 data-rk 与您的rowKey和另一个名为 data-ri 的属性与您的rowIndexVar值。

您可以通过 dtWidgetVar.selection 获取 data-rk 属性（dtWidgetVar是widgetVar的名称您的datatable）。

您现在可以使用remoteCommand将indexRow发送到您的模型

这是代码我曾经测试过：

视图

 < p：remoteCommand name =displayIndexprocess =@ thisupdate =indexactionListener =＃{viewMBean.displayRowIndex} /> 

< p：dataTable id =dtvar =data
 value =＃{viewMBean.dataModel}
 selection =＃{viewMBean.selectedRow} 
 selectionMode =single
 widgetVar =dtVar
 rowIndexVar =index> 
< p：ajax event =rowSelect
 oncomplete =displayIndex（[{name：'index'，value：jQuery（'tr [data-rk ='+ dtVar.selection +'] '）.attr（'data-ri'）}]）process =@ this/> 
< p：column headerText =＃> 
＃{index + 1} 
< / p：column> 
< p：column headerText =Dados> 
＃{data.name} 
< / p：column> 
< / p：dataTable> 
< br /> 
行索引：< p：inputText id =indexvalue =＃{viewMBean.index}/> 
 

托管Bean

  public void displayRowIndex（）{
 FacesContext context = FacesContext.getCurrentInstance（）; 
 Map map = context.getExternalContext（）。getRequestParameterMap（）; 
 String pIndex =（String）map.get（index）; 
 index = Integer.parseInt（pIndex）; 
} 
 

如果您使用复选框选择，您可以检索所选索引：

  function beforeDisplayingIndexes（）{
 var indexes =; 
 jQuery（tbody .ui-chkbox-box）。each（function（）{
 if（jQuery（this）.hasClass（ui-state-active））{
索引=索引+（索引===？：，）+ jQuery（this）.closest（tr）。attr（data-ri）; 
} 
 }）; 
 //仅用于调试
 console.log（indexes）; 
 displayIndex（[{name：'index'，value：indexes}]）
} 
 

您现在应该可以对您的代码进行适当的修改，以便利用这一点。

I have a primefaces datatable i need to display (selected row number) of (total number of rows) in the JSF page.I could get the row numbers displayed in one of the columns using rowIndexVar attribute but i am not getting any idea to display the same numbers separately in the input text on row select.

What should i need to do in JSF page or managed bean to get selected row number.

Please help me in this regard.

Below is my JSF page

<p:dataTable id="workSpaceList" var="data"
            value="#{workSpaceBean.lpInfoList}" widgetVar="multiSelection"
            selection="#{workSpaceBean.selectedRows}" resizableColumns="true"
            liveScroll="true" scrollRows="55" scrollWidth="85%"
            scrollHeight="81%" styleClass="datatable" 
            scrollable="true" rowIndexVar="rowIndex"
            filteredValue="#{workSpaceBean.filteredWorkSpaceItems}">

            <p:column selectionMode="multiple" style="width:3%" />
            <p:column headerText="#" style="width:3%">
                #{rowIndex+1}
            </p:column>
            <p:column headerText="Insured" filterBy="#{data.insuredName}"
                sortBy="#{data.insuredName}" style="width:24%">
                <h:outputText value="#{data.insuredName}" />
                <!--   style="width:250px" -->
            </p:column>

            <p:column headerText="City" filterBy="#{data.custAddress_City}"
                sortBy="#{data.custAddress_City}" style="width:12%">
                <h:outputText value="#{data.custAddress_City}" />
            </p:column>
            .
            .
            .
            .

        </p:dataTable>

I believe that there's not a straight forward way to do so. Although using two ajax requests is not pretty, you can at least achieve the result you expect.

Every row (tr) rendered by your datatable has a attribute called data-rk with your rowKey and another attribute called data-ri with your rowIndexVar value.

You can get the data-rk attribute through dtWidgetVar.selection (dtWidgetVar is the name of the widgetVar in your datatable).

You can now send the indexRow to your model using a remoteCommand

Here is the code I used to test it:

The View

<p:remoteCommand name="displayIndex" process="@this" update="index" actionListener="#{viewMBean.displayRowIndex}"/>

<p:dataTable id="dt" var="data"
             value="#{viewMBean.dataModel}" 
             selection="#{viewMBean.selectedRow}"
             selectionMode="single"
             widgetVar="dtVar"
             rowIndexVar="index">
    <p:ajax event="rowSelect" 
            oncomplete="displayIndex([{name:'index', value:jQuery('tr[data-rk=' + dtVar.selection + ']').attr('data-ri')}])" process="@this" />
    <p:column headerText="#">
        #{index + 1}
    </p:column>
    <p:column headerText="Dados">
        #{data.name}
    </p:column>
</p:dataTable>
<br />
Row Index: <p:inputText id="index" value="#{viewMBean.index}" />

Managed Bean

public void displayRowIndex() {
    FacesContext context = FacesContext.getCurrentInstance();
    Map map = context.getExternalContext().getRequestParameterMap();
    String pIndex = (String) map.get("index");
    index = Integer.parseInt(pIndex);
}

In case you are using checkbox selection, you can retrieve the selected indexes like this:

function beforeDisplayingIndexes(){
    var indexes = "";
    jQuery("tbody .ui-chkbox-box").each(function(){
      if (jQuery(this).hasClass("ui-state-active")){
        indexes = indexes + (indexes === "" ? "" : ",") + jQuery(this).closest("tr").attr("data-ri");
      }
    });
    //for debuging only
    console.log(indexes);
    displayIndex([{name:'index', value:indexes}])
}

You should now be able to make the proper modification to your code to make use of that.