$data = array (
0 =>
array (
'id' => '1',
'name' => 'WEB编程',
'parentid' => '0',
),
1 =>
array (
'id' => '2',
'name' => 'PHP',
'parentid' => '1',
),
2 =>
array (
'id' => '3',
'name' => 'Ajax',
'parentid' => '1',
),
3 =>
array (
'id' => '4',
'name' => 'java',
'parentid' => '1',
),
4 =>
array (
'id' => '5',
'name' => 'WinForm编程',
'parentid' => '0',
),
5 =>
array (
'id' => '6',
'name' => 'VB',
'parentid' => '5',
),
6 =>
array (
'id' => '7',
'name' => 'VC',
'parentid' => '5',
),
);这么一个数组,想得到下面的效果。<select name="categorys">
<optgroup label="WEB编程">
<option value="2" >PHP</option>
<option value="3" >Ajax</option>
<option value="4" >java</option>
</optgroup> <optgroup label="WinForm编程">
<option value="6" >VB</option>
<option value="7" >VC</option>
</optgroup>
</select>
难点在于如何在foreach里判断把<option>包含在<optgroup>里,折腾了半天也没出办法。请高手指点如何完成。
0 =>
array (
'id' => '1',
'name' => 'WEB编程',
'parentid' => '0',
),
1 =>
array (
'id' => '2',
'name' => 'PHP',
'parentid' => '1',
),
2 =>
array (
'id' => '3',
'name' => 'Ajax',
'parentid' => '1',
),
3 =>
array (
'id' => '4',
'name' => 'java',
'parentid' => '1',
),
4 =>
array (
'id' => '5',
'name' => 'WinForm编程',
'parentid' => '0',
),
5 =>
array (
'id' => '6',
'name' => 'VB',
'parentid' => '5',
),
6 =>
array (
'id' => '7',
'name' => 'VC',
'parentid' => '5',
),
);这么一个数组,想得到下面的效果。<select name="categorys">
<optgroup label="WEB编程">
<option value="2" >PHP</option>
<option value="3" >Ajax</option>
<option value="4" >java</option>
</optgroup> <optgroup label="WinForm编程">
<option value="6" >VB</option>
<option value="7" >VC</option>
</optgroup>
</select>
难点在于如何在foreach里判断把<option>包含在<optgroup>里,折腾了半天也没出办法。请高手指点如何完成。
0 => array (
'id' => '1',
'name' => 'WEB编程',
'parentid' => '0',
),
1 => array (
'id' => '2',
'name' => 'PHP',
'parentid' => '1',
),
2 => array (
'id' => '3',
'name' => 'Ajax',
'parentid' => '1',
),
3 => array (
'id' => '4',
'name' => 'java',
'parentid' => '1',
),
4 => array (
'id' => '5',
'name' => 'WinForm编程',
'parentid' => '0',
),
5 => array (
'id' => '6',
'name' => 'VB',
'parentid' => '5',
),
6 => array (
'id' => '7',
'name' => 'VC',
'parentid' => '5',
),
);echo '<select name="categorys">';
foreach($data as $v) {
if($v['parentid'] == 0)
echo "<optgroup label='$v[name]'>";
else
echo "<option value='$v[id]' >$v[name]</option>";
}
echo '</select>';
稍微改下就行了。
$data = array (
0 =>
array (
'id' => '1',
'name' => 'WEB编程',
'parentid' => '0',
),
1 =>
array (
'id' => '2',
'name' => 'PHP',
'parentid' => '1',
),
2 =>
array (
'id' => '3',
'name' => 'Ajax',
'parentid' => '1',
),
3 =>
array (
'id' => '4',
'name' => 'java',
'parentid' => '1',
),
4 =>
array (
'id' => '5',
'name' => 'WinForm编程',
'parentid' => '0',
),
5 =>
array (
'id' => '6',
'name' => 'VB',
'parentid' => '5',
),
6 =>
array (
'id' => '7',
'name' => 'VC',
'parentid' => '5',
),
);
$tempArray = array();
foreach($data as $item){
$tempArray[$item['parentid']][$item['id']] = $item['name'];
}
echo '<select name="categorys">';
foreach($tempArray[0] as $parentid=>$name){
echo "<optgroup label=\"$name\">";
foreach($tempArray[$parentid] as $id=>$name){
echo "<option value=\"$id\" >$name</option>";
}
echo '</optgroup>';
}
echo '</select>';
array (
'id' => '1',
'name' => 'WEB编程',
'parentid' => '0',
'sub'=>
array(
array(
'id' => '2',
'name' => 'PHP',
'parentid' => '1',
),
array (
'id' => '3',
'name' => 'Ajax',
'parentid' => '1',
),
array (
'id' => '4',
'name' => 'java',
'parentid' => '1',
)
)
),
array (
'id' => '5',
'name' => 'WinForm编程',
'parentid' => '0',
'sub'=>
array(
array (
'id' => '6',
'name' => 'VB',
'parentid' => '5',
),
array (
'id' => '7',
'name' => 'VC',
'parentid' => '5',
)
)
)
);
echo '<select style="width:200px;">';
for($i=0,$il=count($data);$i<$il;$i++){
echo '<optgroup label="'.$data[$i]['name'].'">';
for($j=0,$jl=count($data[$i]['sub']);$j<$jl;$j++){
echo '<option>'.$data[$i]['sub'][$j]['name'].'</option>';
}
echo '<optgroup>';
}
echo '</select>';
哦,是少了个 </optgroup>
不过我测试代码时并没有感觉出有与没有的差异一定要有的话,就加个开关变量。要多次循环干什么?
echo '<select name="categorys">';
$k = false;
foreach($data as $v) {
if($v['parentid'] == 0) {
echo "<optgroup label='$v[name]'>";
$k = true;
}else {
if($k) echo '</optgroup>';
echo "<option value='$v[id]' >$v[name]</option>";
$k = false;
}
}
echo '</select>';
这样运行<optgroup>并没有把<option>组包进去。而是单独一对了。
<select name="categorys">
<optgroup label='WEB编程'></optgroup>
<option value='2' >PHP</option>
<option value='3' >Ajax</option>
<option value='4' >java</option>
<optgroup label='WinForm编程'></optgroup>
<option value='6' >VB</option>
<option value='7' >VC</option>
</select>
$k = false;
foreach($data as $v) {
if($v['parentid'] == 0) {
if($k) echo '</optgroup>';
echo "<optgroup label='$v[name]'>";
$k = true;
}else {
echo "<option value='$v[id]' >$v[name]</option>";
$k = false;
}
}
echo '</select>';
$data = array (
0 =>
array (
'id' => '1',
'name' => 'WEB编程',
'parentid' => '0',
),
1 =>
array (
'id' => '2',
'name' => 'PHP',
'parentid' => '1',
),
2 =>
array (
'id' => '3',
'name' => 'Ajax',
'parentid' => '1',
),
3 =>
array (
'id' => '4',
'name' => 'java',
'parentid' => '1',
),
4 =>
array (
'id' => '5',
'name' => 'WinForm编程',
'parentid' => '0',
),
5 =>
array (
'id' => '6',
'name' => 'VB',
'parentid' => '5',
),
6 =>
array (
'id' => '7',
'name' => 'VC',
'parentid' => '5',
),
);
//看看,应该比较通用的了,而且拓展到无限极分类
$d = array();
foreach($data as $item)
$d[$item['parentid']][] = $item;foreach($d[0] as $parent){
echo '<optgroup label="',$parent['name'],'">';
foreach($d[$parent['parentid']] as $item){
echo '<option value="',$item['id'],'">',$item['name'],'</option>';
}
echo '</optgroup>';
}
$k = false;
foreach($data as $v) {
if($v['parentid'] == 0) {
if($k) echo "</optgroup>";
echo "<optgroup label='$v[name]'>";
$k = true;
}else {
echo "<option value='$v[id]' >$v[name]</option>";
}
}
if($k) echo "</optgroup>";
echo "</select>";