请告诉我我在代码中出错的地方 [英] Please show me where I making wrong in code

问题描述

< pre lang =   Javascript >< pre lang =   Javascript> 

我在桌子下面

 <   table     border   =  1 >  
 <  < span class =code-leadattribute> tr  >  
 <   th  >  <  输入    type   = <跨度class =code-keyword>复选框      id   =  selectall    onchange   =  chkall（）  /  >  <  < span class =code-leadattribute> / th  >  
 <   th  >  1 <  < span class =code-leadattribute> / th  >  
 <   th  >  2 <  <跨越式s =code-leadattribute> / th  >  
 <   / tr  >  
 <   tr  >  
 <   td     align   =  center >  <   input    类型  = 复选框      value   =  1  /  >  <   / td  >  
 <   td  >  1 <   / td  >  
 <   td  >  2 <   / td  >  
 <   / tr  >  
 < span class =code-keyword><   tr  >  
 <   td     align   =  center >  <  输入   类型  = 复选框      value   =  2  /  >  <   / td  >  
 <   td  >  1 <   / td  >  
 <   td  >  2 <   / td  >  
 <   / tr  >  
 <   tr  >  
 <   td     align   =  center  >  <  输入   <跨度class =code-attribute> type   = 复选框      value   =   3  /  >  <   / td  >  
 <   td  >  1 <   / td  >  
 <   td  >  2 <   / td  >  
 <   / tr  >  
 <   tr  >  
 < span class =code-keyword><   td     align   =  center >  <  输入    type   = 复选框 < span class =code-attribute>   value   =  4  /  >   <   / td  >  
 <   td  >  1  <   / td  >  
 <   td  >  2  <   / td  >  
 <   / tr  >  
 <   tr  >  
 <   td    对准 <温泉n class =code-keyword> =  center >  <  输入    type   = 复选框      value   =  5  /  >  <   / td  >  
 <   td  >  1 <   / td  >  
 <   td  >  2 <   / td  >  
 <   / tr  >  
 <   / table  >  

我有以下javascript

<前lang =Javascript> 功能 chkall（）{
var sall = document .getElementById（ selectall）;
var il = document .getElementsByTagName（ input）;
if （sall.checked）{
for （ var i = 0 ; i< il.length; i ++）{
il（i）.checked = < span class =code-keyword> true ;
}
}
}

代码假设在我们检查顶部后检查所有检查按钮一。但它没有按照惯例工作，任何人都可以帮助我在代码中出错。

解决方案

你好，



更改您的代码，如下所示。

  function  chkall（）{
 < span class =code-keyword> var  sall =  document  .getElementById（ < span class =code-string> selectall）; 
  var  il =  document  .getElementsByTagName（   input）; 
 alert（sall.checked）; 
  if （sall.checked）{
  for （ var  i =  1 ; i< il.length; i ++）{
 il [i] .checked = < span class =code-keyword> true ; 
} 
} 
} 

问候，

试试这个

 <   table     border   =  1 >  
 <   tr  >  
 <   th  >  <   input     type   =  复选框     < span class =code-attribut e> id   =  selectall    onchange   =  chkall（）  /  >  <   / th  >  
 <   th  > 选择<   / th  >  
 <   th  > 所有<   / th  >  
 <   / tr  >  
 <   tr  >  
 <   td     align   =  center >  <  输入    type   = 复选框   < span class =code-attribute> id   =  1      value   =  1  /   >  <   / td  >  
 <   td  > ;  1 <   / td  >  
 <   td  > ;  2 <   / td  >  
 <   / tr   >  
 <   tr  >  
 < span class =code-keyword><   td     align   =  center >  <  输入    type   = 复选框 < span class =code-attribute>   id   =  2      value   =  2  /  >  <   / td  < span class =code-keyword>>  
 <   td  >  1 <   / td  < span class =code-keyword>>  
 <   td  >  2 <   / td  < span class =code-keyword>>  
 <   / tr  >  
 <   tr  >  
 <   td     align   =  center >  <   input     type   = 复选框    id   =  3      value   =  3   /  >  <   / td  >  
 <   td  >  1 <   / td  >  
 <   td  >  2 <  < span class =code-leadattribute> / td  >  
 <   / tr  >  
 <   tr  >  
 <   td     align   =  center >  <  输入    type   = 复选框    id   =  4    value   =  4  /  >  <   / td  >  
 <   td  >  1 <   / td  >  
 <   td  >  2 <   / td  >  
 <   / tr  >  
 < ;   tr  >  
  <   td     align   =  center >  <   input    类型  = 复选框    id   =  5      value   =  5  /   >  <   / td  >  
 <   td  > ;  1 <   / td  >  
 <   td  > ;  2 <   / td  >  
 <   / tr   >  
 <   / table  >  

 function chkall（）{
  var  sall = document.getElementById（  selectall）; 
  var  il = document.getElementsByTagName（ 输入）; 
 如果（sall。已检查）{
  for （ var  i =  0 ; i <  il.length; i ++）{
 il（i）。已检查 = 真; 
} 
} 
 其他 
 {
  for （ var  i =  0 ; i <  il.length; i ++）{
 il（i）。 checked  =  false ; 
} 
} 
} 

谢谢，

- RG

<pre lang="Javascript"><pre lang="Javascript">

i have below table

<table border="1">
<tr>
	<th><input type="checkbox"  id="selectall" onchange="chkall()"/></th>
	<th>1</th>
	<th>2</th>
</tr>
<tr>
	<td align="center"><input type="checkbox"  value="1"/></td>
	<td>1</td>
	<td>2</td>
</tr>
<tr>
	<td align="center"><input type="checkbox"  value="2"/></td>
	<td>1</td>
	<td>2</td>
</tr>
<tr>
	<td align="center"><input type="checkbox"  value="3"/></td>
	<td>1</td>
	<td>2</td>
</tr>
<tr>
	<td align="center"><input type="checkbox" value="4"/></td>
	<td>1</td>
	<td>2</td>
</tr>
<tr>
	<td align="center"><input type="checkbox"  value="5"/></td>
	<td>1</td>
	<td>2</td>
</tr>
</table>

I have below javascript

function chkall() {
	var sall = document.getElementById("selectall");
	var il = document.getElementsByTagName("input");
	if (sall.checked) {
		for (var i = 0;i < il.length; i++) {
			il(i).checked = true;
		}
	}
}

the code suppose to check all check buttons once we check top one. but its not working as inteded, can anybody help me where i making wrong in code.

解决方案

Hello,

Change your code as shown below.

function chkall() {
	var sall = document.getElementById("selectall");
	var il = document.getElementsByTagName("input");
    alert(sall.checked);
	if (sall.checked) {
		for (var i = 1;i < il.length; i++) {
			il[i].checked = true;
        }
    }
}

Regards,

Try this

<table border="1">
<tr>
    <th><input type="checkbox"  id="selectall" onchange="chkall()"/></th>
    <th>Select</th>
    <th>All</th>
</tr>
<tr>
    <td align="center"><input type="checkbox" id="1"  value="1"/></td>
    <td>1</td>
    <td>2</td>
</tr>
<tr>
    <td align="center"><input type="checkbox" id="2"  value="2"/></td>
    <td>1</td>
    <td>2</td>
</tr>
<tr>
    <td align="center"><input type="checkbox" id="3"  value="3"/></td>
    <td>1</td>
    <td>2</td>
</tr>
<tr>
    <td align="center"><input type="checkbox" id="4" value="4"/></td>
    <td>1</td>
    <td>2</td>
</tr>
<tr>
    <td align="center"><input type="checkbox" id="5"  value="5"/></td>
    <td>1</td>
    <td>2</td>
</tr>
</table>

function chkall() {
       var sall = document.getElementById("selectall");
       var il = document.getElementsByTagName("input");
       if (sall.checked) {
           for (var i = 0; i < il.length; i++) {
               il(i).checked = true;
           }
       }
       else
       {
           for (var i = 0; i < il.length; i++) {
               il(i).checked = false;
           }
       }
   }

Thanks,
--RG

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