表单提交问题

[donbe]

为什么这个表单中 点击 image按钮 也会提交表单

                                  <form name="form_music" enctype="application/x-www-form-urlencoded"  method="get" action="plays.asp" >
                                    <tr>
                                    <td><table width="100%" border="0" cellspacing="0" cellpadding="0">
                                      <tr>
                                        <td align="right"><input type="image" src="../weihu/images/quanxuan.gif" width="57" height="22" /></td>
                                        <td align="center"><input type="image" src="../weihu/images/fanxuan.gif" width="57" height="22" onclick="selectall();" /></td>
                                        <td><input type="image" src="../weihu/images/lianbo.gif" width="57" height="22" /></td>
                                      </tr>
                                    </table></td>
                                  </tr> <input type="submit" value="提交" />
                                  </form>
                                  
                               
<script language="javascript" type="text/javascript">
								  
function selectall()
{
var el=document.getElementsByTagName("input");
var len = el.length;    
for(var i=0; i<len; i++) 
{
	if((el[i].type=="checkbox") && (el[i].name=="musicid")) 
	{
	if(el[i].checked==false){
	 el[i].checked=true;}
	 else
	 {
	 el[i].checked=false;
	 }
	 }
} 
}
                                  
                                  </script>

[澄仙]

image控件本身也有submit的性质 也可以做提交按钮 这个没什么好说的吧？ 呵

[一把编程的菜刀]

onclick="return selectall();"
试试看

[jingzhao1985]

                                  <form name="form_music" enctype="application/x-www-form-urlencoded"  method="get" action="plays.asp" >
                                    <tr>
                                    <td><table width="100%" border="0" cellspacing="0" cellpadding="0">
                                      <tr>
                                        <td align="right"><input type="image" src="../weihu/images/quanxuan.gif" width="57" height="22" /></td>
                                        <td align="center"><input type="image" src="../weihu/images/fanxuan.gif" width="57" height="22" onclick="selectall();" /></td>
                                        <td><input type="image" src="../weihu/images/lianbo.gif" width="57" height="22" />这个地方不要用input，直接用<img src="="../weihu/images/lianbo.gif" /> </td>
                                      </tr>
                                    </table></td>
                                  </tr> <input type="submit" value="提交" />
                                  </form>
                                  
                               
<script language="javascript" type="text/javascript">
                                  
function selectall()
{
var el=document.getElementsByTagName("input");
var len = el.length;    
for(var i=0; i<len; i++) 
{
    if((el[i].type=="checkbox") && (el[i].name=="musicid")) 
    {
    if(el[i].checked==false){
     el[i].checked=true;}
     else
     {
     el[i].checked=false;
     }
     }
} 
}
                                  
                                  </script>

[jingzhao1985]

再贴一次
<form name="form_music" enctype="application/x-www-form-urlencoded" method="get" action="plays.asp" >
<tr>
<td><table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td align="right">><input type="image" src="../weihu/images/quanxuan.gif" width="57" height="22" />这个地方不要用input，直接用<img src="../weihu/images/quanxuan.gif" /></td>
<td align="center"><input type="image" src="../weihu/images/fanxuan.gif" width="57" height="22" onclick="selectall();" />这个地方不要用input，直接用<img src="../weihu/images/fanxuan.gif" onclick="selectall();"/> </td>
<td<input type="image" src="../weihu/images/lianbo.gif" width="57" height="22" />这个地方不要用input，直接用<img src="../weihu/images/lianbo.gif" /> </td>
</tr>
</table></td>
</tr> <input type="submit" value="提交" />
</form>


<script language="javascript" type="text/javascript">

function selectall()
{
var el=document.getElementsByTagName("input");
var len = el.length;
for(var i=0; i<len; i++)
{
if((el[i].type=="checkbox") && (el[i].name=="musicid"))
{
if(el[i].checked==false){
el[i].checked=true;}
else
{
el[i].checked=false;
}
}
}
}

</script>