Vue reported an error: Cannot read property 'toLowerCase' of undefined "

<template>
  <div class="pagination">
    <el-row type="flex" justify="end" >
      <el-pagination
        background
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="currentPage"
        :page-sizes="pageSizes"
        :page-size="pageSize"
        :pager-count="5"
        layout="sizes, prev, pager, next, jumper"
        :total="total">
      </el-pagination>
    </el-row>
  </div>
</template>

when you click on the number of pages to modify, or the number of entries displayed on each page will report the following error

vue.esm.js?efeb:591 [Vue warn]: Error in event handler for "size-change": "TypeError: Cannot read property "toLowerCase" of undefined"

how do I correct this error?

Vue.js front-end

Mar.16,2021

There is no problem with

paging. Your code

in the size-change event

because you called the string method in the function handleSizeChange , toLowerCase , but the value you get is undefined, which does not have a string method.

is my own problem in the size-change function, and the parameters are not passed correctly

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1ea82a7-1eb6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ea82a7-1eb6.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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