在表单提交前进行验证的几种方式

var txt_firstname = $.trim($("#firstname").attr("value"));

var isSuccess = 1;

if(txt_ == 0)

{

$("#firstnameLabel").text("firstname不能为空！")

$("#firstnameLabel").css({"color":"red"});

isSuccess = 0;

}

if(isSuccess == 0){

return false;

}

return true;

}

注意：onsubmit=“return false”为不执⾏提交；onsubmit=“return true”或onsubmit=“return ”都执⾏提交。3 去掉submit类型button，直接⽤普通button.提交

function checktosubmit(){

var txt_firstname = $.trim($("#firstname").attr("value"));

var isSuccess = 1;

if(txt_ == 0)

{

$("#firstnameLabel").text("firstname不能为空！")

$("#firstnameLabel").css({"color":"red"});

isSuccess = 0;

}

if(isSuccess == 1)

{

();

}

} 原⽂链接：/qian_f/article/details/9631691

2023年6月21日发(作者：)

在表单提交前进⾏验证的⼏种⽅式1在button的submit事件时判断提交

("#form").bind("submit",function(){ var txt_firstname = $.trim($("#firstname").attr("value")); var isSuccess = 1;//默认验证通过 if(txt_ == 0){

$("#firstnameLabel").text("firstname不能为空！")

$("#firstnameLabel").css({"color":"red"});

isSuccess = 0; //验证不通过，修改isSuccess }

if(isSuccess == 0){ return false;//最后未通过，不提交

}})2 在form的onsubmit判断function check(){

var txt_firstname = $.trim($("#firstname").attr("value"));

var isSuccess = 1;

if(txt_ == 0)

{

$("#firstnameLabel").text("firstname不能为空！")

$("#firstnameLabel").css({"color":"red"});

isSuccess = 0;

}

if(isSuccess == 0){

return false;

}

return true;

}

注意：onsubmit=“return false”为不执⾏提交；onsubmit=“return true”或onsubmit=“return ”都执⾏提交。3 去掉submit类型button，直接⽤普通button.提交

function checktosubmit(){

var txt_firstname = $.trim($("#firstname").attr("value"));

var isSuccess = 1;

if(txt_ == 0)

{

$("#firstnameLabel").text("firstname不能为空！")

$("#firstnameLabel").css({"color":"red"});

isSuccess = 0;

}

if(isSuccess == 1)

{

();

}

} 原⽂链接：/qian_f/article/details/9631691