var pageSizeComponent;        //分页控制toolbar表单pageSize组件
var pageForm;        //分页控制toolbar表单名称

//分页页面加载时获取pagesize组件并重构其change事件方法
window.onload = function() {
    pageForm = document.pager;
    var inputElements = pageForm.getElementsByTagName("input");
    pageSizeComponent = inputElements[inputElements.length - 1];
    pageSizeComponent.attachEvent("onchange", convertPagesize);
}

//pagesize组件onchange事件方法
function convertPagesize() {
    pageForm.pageNo.value = '1';
    if (!z.test(trim(pageSizeComponent.value)) || Number(pageSizeComponent.value) > 10000) {
        pageSizeComponent.value = 20;
    }
    pageForm.pageSize.value = pageSizeComponent.value;
    pageForm.submit();
}