jsf提交验证(<a4j:commandButton><h:commandButton>)

 function checkform(){
      var flag=true;
var biaoti=document.getElementById("form1:fieldsDataTable-4028839d2b2ce122012b2dba78fa12e4:0:BT-4028839d2b2ce122012b2dba78fa12e4").value;
       if(biaoti==""){
         alert("资料标题不能为空");
         return false;
       }
      return flag;

 }

//<a4j:commandButton>验证

<a4j:commandButton value="保存" onclick="if(!checkform())return"
actionListener="#{ziliaoguanlimokuai_ziliaoguanli_detailBean.baocunAction}"
styleClass="button-02" />

//<h:commandButton>验证

<h:commandButton value="保存" onclick="return checkform();"
id="tianjiaziliaoguanlimokuai_tblfujian_listBean"
action="#{ziliaoguanlimokuai_ziliaoguanli_detailBean.tianjiaAction}"
styleClass="button-02" />