时间:2021-07-01 10:21:17 帮助过:15人阅读
- $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。
- $data = array (
- 0 => array (
- 'id' => '1',
- 'name' => 'WEB编程',
- 'parentid' => '0',
- ),
- 1 => array (
- 'id' => '2',
- 'name' => 'PHP',
- 'parentid' => '1',
- ),
- 2 => array (
- 'id' => '3',
- 'name' => 'Ajax',
- 'parentid' => '1',
- ),
- 3 => array (
- 'id' => '4',
- 'name' => 'java',
- 'parentid' => '1',
- ),
- 4 => array (
- 'id' => '5',
- 'name' => 'WinForm编程',
- 'parentid' => '0',
- ),
- 5 => array (
- 'id' => '6',
- 'name' => 'VB',
- 'parentid' => '5',
- ),
- 6 => array (
- 'id' => '7',
- 'name' => 'VC',
- 'parentid' => '5',
- ),
- );
- echo '<select name="categorys">';
- foreach($data as $v) {
- if($v['parentid'] == 0)
- echo "<optgroup label='$v[name]'>";
- else
- echo "<option value='$v[id]' >$v[name]</option>";
- }
- echo '</select>';
唠叨大哥,你上面的操作还是缺了结束符啊</optgroup>
我就是在苦闷如何把这个</optgroup>加进去。
- echo "<optgroup label='$v[name]'>$v[name]</optgroup>";
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>';
只是foreach了三次怕效率较差,不知还没有有别的方法。
重做数组的话……
- $data = array (
- array (
- 'id' => '1',
- 'name' => 'WEB编程',
- 'parentid' => '0',
- 'sub'=>
- array(
- array(
- 'id' => '2',
- 'name' => 'PHP',
- 'parentid' => '1',
- ),
- array (
- 'id' => '3',
- 'name' => 'Ajax',
- 'parentid' => '1',
- ),
- array (
- 'id' => '4',
- 'name' => 'java',
- 'parentid' => '1',
- )
- )
- ),
- array (
- 'id' => '5',
- 'name' => 'WinForm编程',
- 'parentid' => '0',
- 'sub'=>
- array(
- array (
- 'id' => '6',
- 'name' => 'VB',
- 'parentid' => '5',
- ),
- array (
- 'id' => '7',
- 'name' => 'VC',
- 'parentid' => '5',
- )
- )
- )
- );
- echo '<select style="width:200px;">';
- for($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>';
是吗?
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>';
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