jsp中，控件checkbox为空取值问题！！！急_框架

你没选择的话，

String[] classid = requestgetParameterValues("ckbox");

所以 classid 是null

本身是没问题的，

但是for(int i=0;i<classidlength;i++)

在这里，你取了一个空数组的length，

这个对象是空的，

你对他取length，

java会报空指针异常的·······

你好！——

首先，你的提问很有意思。大概是不是指如果在Servlet或Action里接受页面textbox元素的值？

textbox 控件是可复选的。

Servlet：String[] array = requestgetParameterValues("elementName");

Action：String[] array //实现getter and setter即可，Struts2自动将值注入Action对应的属性。

这个控件我也用过

下面是我修改过的代码我能测试通过

主要修改的地方是获取对象元素的方法由name改成id

////////////////////下面代码

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 40 Transitional//EN">

<HTML>

<HEAD>

<TITLE> New Document </TITLE>

var myC_x,myC_y;

var myC_timeset=null,myC_timeset1=null;

var divObj=null;

var inputName;

function myCalendar() //构建对象

{

var myDate = new Date();

thisyear = myDategetFullYear();

thismonth = myDategetMonth()+1;

thisdate = myDategetDate();

thisformat="yyyy-mm-dd";

thisstyle = myStyle(1);

thisshow = createCalendar;

thisinput = createInput;

}

function myStyle(num) //设置样式

{

if(!num||isNaN(num)){alert('参数不对,采用默认样式！');num=1;}

var style = new Array();

style[1]="week{background-color:#DfDfff;font-size:12px;width:140px;}"

+"ds{width:140px;font-size:12px;cursor:hand}"

+"mover{border:1px solid black;background-color:#f4f4f4;}"

+"move1{border:1px solid #5d5d5d;background-color:#f4f4f4;color:#909eff;font-size:12px}"

+"tit{background-color:#909EFF;width:140px;font-size:12px;color:white;cursor:default}"

+"cs{position:absolute;border:1px solid #909eff;width:142px;left:0px;top:0px;z-index:9999;}"

+"shadow{position:absolute;left:0px;top:0px;font-family: Arial Black;font-size:50px;color:#d4d4d4;z-index:1;text-align:center;}";

documentwrite("<style type='text/css'>");

documentwrite(style[num]);

documentwrite("</style>");

}

function createCalendar()

{

var week = new Array('日','一','二','三','四','五','六');

documentwrite("<div class='cs' onselectstart='return false' oncontextmenu='return false' onmousedown='if(eventbutton==2)thisstyledisplay=\"none\"' id='myC_div'><div class='shadow'></div><div style='position:absolute;left:0px;top:0px;z-index:1'>");

//创建头部

documentwrite("<table class='tit' id='myC_Top' onmousedown='myC_x=eventx-parentNodeparentNodestylepixelLeft;myC_y=eventy-parentNodeparentNodestylepixelTop;setCapture()' onmouseup='releaseCapture();' onmousemove='myCMove(thisparentElementparentElement);'><tr><td width=10 onmouseover='thisstylecolor=\"black\"' onmouseout='thisstylecolor=\"\"' onclick='cutYear()' style='font-family: Webdings;cursor:hand;' title='减少年份'>7</td><td title='减少月份' onmouseover='thisstylecolor=\"black\"' onclick='cutMonth()' onmouseout='thisstylecolor=\"\"' width=10 style='font-family: Webdings;cursor:hand;'>3</td><td align=center onmouseover=thisclassName='move1'; onmouseout=thisclassName='';divHidden(myCparentElementnextSibling); onclick='createyear("+thisyear+",this);divShow(myCparentElementnextSibling);'></td><td align=center onclick='createmonth("+thismonth+",this);divShow(myCparentElementnextSibling)' onmouseover=thisclassName='move1'; onmouseout=thisclassName='';divHidden(myCparentElementnextSibling);></td><td width=10 onmouseover='thisstylecolor=\"black\"' onmouseout='thisstylecolor=\"\"' onclick='addMonth()' style='font-family: Webdings;cursor:hand;' title='增加月份'>4</td><td width=10 style='font-family: Webdings;cursor:hand;' onmouseover='thisstylecolor=\"black\"' onmouseout='thisstylecolor=\"\"' onclick='addYear()' title='增加年份'>8</td></tr></table>");

//创建星期条目

documentwrite("<table class='week'><tr>");

for(i=0;i<7;i++)

documentwrite("<td align=center>"+week[i]+"</td>");

documentwrite("</tr></table>");

//创建日期条目

documentwrite("<table class='ds' id='myC' cellspacing=2 cellpadding=0>");

for(i=0;i<6;i++)

{

documentwrite("<tr>");

for(j=0;j<7;j++)

documentwrite("<td width=10% height=16 align=center onmouseover='mOver(this)' onmouseout='mOut(this)' onclick='if(thisinnerText!=\"\")getValue(inputName,thisinnerText);myC_divstyledisplay=\"none\"'></td>");

documentwrite("</tr>");

}

documentwrite("</table>");

//建建水印

documentwrite("</div>");

//创建选择图层

documentwrite("<div style='position:absolute;left:0px;top:0px;z-index:3' onmouseover=divShow(this) onmouseout=divHidden(this)></div>");

documentwrite("</div>");

//显示日期

showDate(thisyear,thismonth);

myC_divstyledisplay='none';

}

function getValue(obj,value)

{

var tonylinzhen=documentgetElementById(obj);

tonylinzhenvalue=parseInt(myC_Topcells[2]innerText)+"-"+parseInt(myC_Topcells[3]innerText)+"-"+value;

}

function showDate(year,month)

{

var myDate = new Date(year,month-1,1);

var today = new Date();

var day = myDategetDay();

var length = new Array(31,30,31,30,31,30,31,31,30,31,30,31);

length[1] = ((year%4==0)&&(year%100!=0)||(year%400==0))29:28;

for(i=0;i<myCcellslength;i++)myCcells[i]innerHTML = "";

for(i=0;i<length[month-1];i++)

{

myCcells[i+day]innerHTML = (i+1);

if(new Date(year,month-1,i+1)getDay()==6||new Date(year,month-1,i+1)getDay()==0){myCcells[i+day]stylecolor='red';}

}

myC_Topcells[2]innerText=year+"年";

myC_Topcells[3]innerText=month+"月";

with(myCparentNodepreviousSiblingstyle)

{

pixelLeft=myCoffsetLeft;

pixelTop=myCoffsetTop;

height = myCclientHeight;

width = myCclientWidth;

}

myCparentElementparentElementstyleheight=myCparentElementoffsetHeight;

myCparentElementpreviousSiblinginnerHTML=year;

}

//一些附加函数--------------------

//---------Begin-------------------

function mOver(obj){objclassName = 'mover';}

function mOut(obj){if(objclassName=='mover')objclassName = '';}

function addYear(){var year = parseInt(myC_Topcells[2]innerText);var month = parseInt(myC_Topcells[3]innerText); year++;showDate(year,month);}

function addMonth(){var year = parseInt(myC_Topcells[2]innerText);var month = parseInt(myC_Topcells[3]innerText);month++;if(month>12){month=1;year++;}showDate(year,month);}

function cutYear(){var year = parseInt(myC_Topcells[2]innerText);var month = parseInt(myC_Topcells[3]innerText);year--;showDate(year,month);}

function cutMonth(){var year = parseInt(myC_Topcells[2]innerText);var month = parseInt(myC_Topcells[3]innerText);month--;if(month<1){month=12;year--;}showDate(year,month);}

function divS(obj)

{

if(obj!=divObj)

{

objstylebackgroundColor="#909eff";

objstylecolor='black';

}

if(divObj!=null)

{

divObjstylebackgroundColor='';

divObjstylecolor='';

}

divObj = obj;

}

function divShow(obj)

{ if (myC_timeset!=null) clearTimeout(myC_timeset);

objstyledisplay='block';

}

function divHidden(obj){myC_timeset=windowsetTimeout(function(){objstyledisplay='none'},500);}

function createyear(year,obj)//创建年份选择

{

var ystr;

var oDiv;

ystr="<table class='move1' cellspacing=0 cellpadding=2 width="+objoffsetWidth+">";

ystr+="<tr><td style='cursor:hand' onclick='createyear("+(year-20)+",myC_Topcells[2])' align=center>上翻</td></tr>";

for(i=year-10;i<year+10;i++)

if(year==i)

ystr+="<tr style='background-color:#909eff'><td style='color:black;height:16px;cursor:hand' align=center onclick='myC_Topcells[2]innerText=thisinnerText;showDate("+i+",parseInt(myC_Topcells[3]innerText));myCparentElementnextSiblinginnerHTML=\"\"'>"+i+"年</td></tr>";

else

ystr+="<tr><td align=center style='cursor:hand' onmouseover=divS(this) onclick='myC_Topcells[2]innerText=thisinnerText;showDate("+i+",parseInt(myC_Topcells[3]innerText));myCparentElementnextSiblinginnerHTML=\"\"'>"+i+"年</td></tr>";

ystr+="<tr><td style='cursor:hand' onclick='createyear("+(year+20)+",myC_Topcells[2])' align=center>下翻</td></tr>";

ystr+="</table>";

oDiv = myCparentElementnextSibling;

oDivinnerHTML='';

oDivinnerHTML = ystr;

showDiv(oDiv,objoffsetTop+objoffsetHeight,objoffsetLeft);

}

function createmonth(month,obj)//创建月份选择

{

var mstr;

var oDiv;

mstr="<table class='move1' cellspacing=0 cellpadding=2 width="+(objoffsetWidth+5)+">";

for(i=1;i<13;i++)

if (month==i)

mstr+="<tr style='background-color:#909eff'><td style='color:black;height:16px;cursor:hand' align=center onclick='myC_Topcells[3]innerText=thisinnerText;showDate(parseInt(myC_Topcells[2]innerText),"+i+");myCparentElementnextSiblinginnerHTML=\"\"'>"+i+"月</td></tr>";

else

mstr+="<tr><td align=center style='cursor:hand' onmouseover='divS(this)' onclick='myC_Topcells[3]innerText=thisinnerText;showDate(parseInt(myC_Topcells[2]innerText),"+i+");myCparentElementnextSiblinginnerHTML=\"\"'>"+i+"月</td></tr>";

mstr+="</table>";

oDiv = myCparentElementnextSibling;

oDivinnerHTML='';

oDivinnerHTML = mstr;

showDiv(oDiv,objoffsetTop+objoffsetHeight,objoffsetLeft);

}

function showDiv(obj,top,left)

{

objstylepixelTop=top;

objstylepixelLeft=left;

}

function myCMove(obj)

{

if(eventbutton==1)

{

var X = objclientLeft;

var Y = objclientTop;

objstylepixelLeft= X+(eventx-myC_x);

objstylepixelTop= Y+(eventy-myC_y);

windowstatus=myC_y;

}

function showDiv2(obj)

{

inputName=objid;

var e=obj;

var ot = objoffsetTop;

var ol=objoffsetLeft;

while(obj=objparentElement){ot+=objoffsetTop;ol+=objoffsetLeft;}

myC_divstylepixelTop=ot+eoffsetHeight;

myC_divstylepixelLeft=ol;

myC_divstyledisplay="block";

}

function createInput(name)

{myC_divstyledisplay='none';

documentwrite("<input type='text' id='"+name+"' size=20 onfocus='showDiv2(this)'>");

}

// --------------End ---------------------

</script>

var myCalendar=new myCalendar;

myCalendaryear=2009;

myCalendarshow();

myCalendarinput("txt1");

</script>

</HEAD>

<BODY>

<form>

</form>

</BODY>

</HTML>

<input type="button" name="check" value="check"/>--->查询<input type="button" name="update" value="update"/>--->更新在servlet中通过String type = requestgetParameter("name")获取，然后判断。

//声名两个单选按钮

private JRadioButton male;

private JRadioButton female;

//初始化按钮，男为默认选中

male = new JRadioButton("男", true);

female = new JRadioButton("女");

//将两个按钮放到同一个组中

ButtonGroup group = new ButtonGroup();

groupadd(male);

groupadd(female);

//在actionPerformed()中获得按钮的选择值

DefaultButtonModel model = (DefaultButtonModel) malegetModel();

if (modelgetGroup()isSelected(model))

//男被选中的处理

else

//女被选中的处理

我觉得你可以这样实现。这样接受传过来的参数

<% String id= requestgetParameterNames(“id”);

然后下面是js代码赋值。

o = documentgetElementById("select3"); for(i=0;i<olength;i++){ if(ooptions[i]selected){ alert(ooptions[i]value); } }

以上就是关于jsp中，控件checkbox为空取值问题！！！急全部的内容，包括:jsp中，控件checkbox为空取值问题！！！急、JSP中如何获得textbox的值，然后传给JSP或Action,我用的是Struts2、jsp表单得不到js日历控件的返回值等相关内容解答，如果想了解更多相关内容，可以关注我们，你们的支持是我们更新的动力！

欢迎分享，转载请注明来源：内存溢出

原文地址:https://54852.com/web/9388150.html

jsp中，控件checkbox为空取值问题！！！急

发表评论

评论列表（0条）