Question

我想像我在javascript中一样使用php通过id访问下拉列表选项。我也想在php中完成这项工作。有没有办法做到这一点。请指导。我的JS代码是。

var opt = amove.options[amove.selectedIndex];

   if(opt.id =="Exchange"){          
      document.getElementById('barcode2lb').style.display='block';

      document.getElementById('barcode2txt').style.display='block';
}
else{

     document.getElementById('barcode2lb').style.display='none';

     document.getElementById('barcode2txt').style.display='none';
}

Answer 1

如果您使用原始php，则

<select name="">
  <option value=""> select a option </option>
<?php
  $sql = 'SELECT * FROM table ORDER BY id ASC';
  $result_select = mysql_query($sql);
  $rows = array();
  while($row = mysql_fetch_array($result_select)){
    if($row['which column you want to compare'] == value){
      echo "<option value="".$row['value index']."">".$row['value index']." </option>"
   }
  }
?>

Answer 2

例如，

<select>
<?php foreach($yourArr as $row):
if(yourConidtion){
  $selected='selected';
}else{
  $selected='';
}?>
<option value="<?= $row->id?>" <?= $selected ?>><?= $row->name ?></option>
<?php endforeach;?>
</select>

我想这就是你要的

Answer 3

class App extends React.Component { state = { data_rows: [ [ "Research", "Find sources", new Date(2015, 0, 1), new Date(2015, 0, 5), null, 100, null ], [ "Write", "Write paper", null, new Date(2015, 0, 9), daysToMilliseconds(3), 25, "Research,Outline" ], [ "Cite", "Create bibliography", null, new Date(2015, 0, 7), daysToMilliseconds(1), 20, "Research" ], [ "Complete", "Hand in paper", null, new Date(2015, 0, 10), daysToMilliseconds(1), 0, "Cite,Write" ], [ "Outline", "Outline paper", null, new Date(2015, 0, 6), daysToMilliseconds(1), 100, "Research" ] ] }; onAddRow() { let newState = Object.assign({}, this.state); newState.data_rows.push([ "Task" + newState.data_rows.length, "Some new task", null, new Date(2015, 0, 6), daysToMilliseconds(1), 100, "Research" ]); this.data_rows++; this.setState(newState); } getHeight() { if (document.getElementsByTagName("svg")[0]) { document .getElementsByTagName("svg")[0] .setAttribute("height", (this.state.data_rows.length + 1) * 42); document .getElementsByTagName("svg")[1] .setAttribute("height", (this.state.data_rows.length + 1) * 42); } return (this.state.data_rows.length + 1) * 42; } render() { return ( <div className="App"> <span style={{ backgroundColor: "#0f0", cursor: "pointer" }} onClick={() => this.onAddRow()} > add row </span> <div id="chart_div"> <Chart chartType="Gantt" data={[columns, ...this.state.data_rows]} width="100%" height={this.getHeight()} legendToggle /> </div> <div> </div> </div> ); } }是服务器端语言，因此您将需要PHP使用AJAX发布ID值。从您的JS代码进行AJAX调用，并处理JS代码中的数据

我如何使用php通过id获取选择选项

3 个答案: