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1在button的submit事件时判断
<button type="submit">提交</button>
("#form").bind("submit",function(){
var txt_firstname = $.trim($("#firstname").attr("value"));
var isSuccess = 1;//默认验证通过
if(txt_firstname.length == 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
<form id="form" method="post" action="/DealWithForm/" onsubmit="return check()">
function check(){ var txt_firstname = $.trim($("#firstname").attr("value")); var isSuccess = 1; if(txt_firstname.length == 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.
<button type="button" onclick="checktosubmit()">提交</button>
function checktosubmit(){
var txt_firstname = $.trim($("#firstname").attr("value"));
var isSuccess = 1;
if(txt_firstname.length == 0)
{
$("#firstnameLabel").text("firstname不能为空！")
$("#firstnameLabel").css({"color":"red"});
isSuccess = 0;
}
if(isSuccess == 1)
{
form.submit();
}
}
原文链接：http://blog.csdn.net/qian_f/article/details/9631691
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原文地址：http://www.cnblogs.com/alexandra/p/5560048.html
