需要用户能够将“添加选项”添加到选择列表中

Question

编辑将医疗手术事件添加到Google日历的表单。在表单上是一个（外科医生列表）选择框，它从index.php文件中提取选项值。我试图改变这种情况，让用户通过在文本框中输入名称然后单击“添加”按钮来将“外科医生”添加到该选择框列表中。

我的解决方案是在“外科医生列表”选择框下添加一个文本字段和一个按钮。在名称中键入，然后单击提交按钮会将新的外科医生姓名写入XML文件。然后，我将“外科医生列表”选择框从XML文件中拉出它的选项值。

我能够创建输入框和按钮，将新的外科医生名称添加到XML文件，但现在我有两个提交按钮。当我尝试将新的外科医生姓名添加到XML文件时，它认为我已经完成了整个表单，并且正在尝试提交它。如何在不提交表单的情况下将新选项值发送到XML文件？任何信息表示赞赏。

这是当前选择框（不是从XML文件还拉）和我下面的XML添加现场...

<input type="hidden" name="action" value="<?php if($edit) echo 'edit';else echo 'insert';?>"> 
    <input type="hidden" name="event_id" value="<?php if($edit) echo $event_data['id'];else echo '0';?>"> 
    <div class="col-md-6 col-sm-6 col-xs-12"> 
    <div class="form-group"> 
    <label for="event_title">Surgeon Name <span class="required">*</span></label> 
    <select name="event_title" id="event_title" class="form-control required"> 
    <option value="BERASI"> BERASI</option> 
    <option value="BERGHOFF"> BERGHOFF</option> 
    <option value="BIGGS"> BIGGS</option> 
    <option value="BORUS"> BORUS</option> 
    <option value="BURKE"> BURKE</option> 
    <option value="CANNONE"> CANNONE</option> 
    <option value="DEARBORN"> DEARBORN</option> 
    </select> 
    </div> 
    </div> 

    <div class="col-md-6 col-sm-6 col-xs-12"> 
    <div class="form-group"> 
    <form action="index.php" method="post"> 
    <label for="surgeon" >Surgeon</label> 
    <input type="text" name="surgeon" class="btn btn-secondary"/> 
    <input type="submit" name="ok" value="add"/> 
    </div> 
    </div> 

目前提交我的除了与冲突在窗体上按钮在这里...

<input type="hidden" name="action" value="<?php if($edit) echo 'edit';else echo 'insert';?>"> 
    <input type="hidden" name="event_id" value="<?php if($edit) echo $event_data['id'];else echo '0';?>"> 
    <div class="col-md-6 col-sm-6 col-xs-12"> 
    <div class="form-group"> 
    <label for="event_title">Surgeon Name <span class="required">*</span></label> 
    <select name="event_title" id="event_title" class="form-control required"> 
    <option value="BERASI"> BERASI</option> 
    <option value="BERGHOFF"> BERGHOFF</option> 
    <option value="BIGGS"> BIGGS</option> 
    <option value="BORUS"> BORUS</option> 
    <option value="BURKE"> BURKE</option> 
    <option value="CANNONE"> CANNONE</option> 
    <option value="DEARBORN"> DEARBORN</option> 
    </select> 
    </div> 
    </div> 

    <div class="col-md-6 col-sm-6 col-xs-12"> 
    <div class="form-group"> 
    <form action="index.php" method="post"> 
    <label for="surgeon" >Surgeon</label> 
    <input type="text" name="surgeon" class="btn btn-secondary"/> 
    <input type="submit" name="ok" value="add"/> 
    </div> 
    </div> 

这里是我的窗体的图像... enter image description here

这里是摇摆JSC代码...

import java.awt.BorderLayout; 
    import java.awt.Cursor; 
    import java.awt.Dimension; 
    import java.awt.event.ActionEvent; 
    import java.awt.event.ActionListener; 
    import java.awt.event.KeyAdapter; 
    import java.awt.event.KeyEvent; 
    import java.awt.event.WindowAdapter; 
    import java.awt.event.WindowEvent; 
    import java.awt.event.WindowListener; 
    import java.io.File; 
    import java.io.FileInputStream; 
    import java.io.FileOutputStream; 
    import java.io.ObjectInput; 
    import java.io.ObjectInputStream; 
    import java.io.ObjectOutput; 
    import java.io.ObjectOutputStream; 
    import java.net.URL; 

    import javax.swing.Box; 
    import javax.swing.BoxLayout; 
    import javax.swing.ComboBoxModel; 
    import javax.swing.JComboBox; 
    import javax.swing.JEditorPane; 
    import javax.swing.JFrame; 
    import javax.swing.JLabel; 
    import javax.swing.JOptionPane; 
    import javax.swing.JPanel; 
    import javax.swing.JScrollPane; 
    import javax.swing.JTextField; 
    import javax.swing.event.HyperlinkEvent; 
    import javax.swing.event.HyperlinkListener; 

    public class MemComboBoxDemo extends JFrame { 

     protected MemComboBox urlComboBox = new MemComboBox(); 

     public MemComboBoxDemo() { 
     super(); 
     setSize(300, 100); 
     getContentPane().setLayout(new BorderLayout()); 

     JPanel p = new JPanel(); 
     p.setLayout(new BoxLayout(p, BoxLayout.X_AXIS)); 
     p.add(new JLabel("Address")); 

     urlComboBox.load("addresses.dat"); 
     ComboBoxListener lst = new ComboBoxListener(); 
     urlComboBox.addActionListener(lst); 

     MemComboAgent agent = new MemComboAgent(urlComboBox); 

     p.add(urlComboBox); 
     getContentPane().add(p, BorderLayout.NORTH); 

     WindowListener wndCloser = new WindowAdapter() { 
      public void windowClosing(WindowEvent e) { 
      urlComboBox.save("addresses.dat"); 
      System.exit(0); 
      } 
     }; 
     addWindowListener(wndCloser); 

     setVisible(true); 
     urlComboBox.grabFocus(); 
       } 

     class ComboBoxListener implements ActionListener{ 
     public void actionPerformed(ActionEvent evt) { 
      System.out.println(urlComboBox.getSelectedItem()); 
     } 
     } 

     public static void main(String argv[]) { 
     new MemComboBoxDemo(); 
     } 
    } 

    class MemComboAgent extends KeyAdapter { 
     protected JComboBox comboBox; 

     protected JTextField editor; 

     public MemComboAgent(JComboBox c) { 
     comboBox = c; 
     editor = (JTextField) c.getEditor().getEditorComponent(); 
     editor.addKeyListener(this); 
     } 

     public void keyReleased(KeyEvent e) { 
     char ch = e.getKeyChar(); 
     if (ch == KeyEvent.CHAR_UNDEFINED || Character.isISOControl(ch)) 
      return; 
     int pos = editor.getCaretPosition(); 
     String str = editor.getText(); 
     if (str.length() == 0) 
      return; 

     for (int k = 0; k < comboBox.getItemCount(); k++) { 
      String item = comboBox.getItemAt(k).toString(); 
      if (item.startsWith(str)) { 
      editor.setText(item); 
      editor.setCaretPosition(item.length()); 
      editor.moveCaretPosition(pos); 
      break; 
      } 
     } 
     } 
    } 

    class MemComboBox extends JComboBox { 
     public static final int MAX_MEM_LEN = 30; 

     public MemComboBox() { 
     super(); 
     setEditable(true); 
     } 

     public void add(String item) { 
     removeItem(item); 
     insertItemAt(item, 0); 
     setSelectedItem(item); 
     if (getItemCount() > MAX_MEM_LEN) 
      removeItemAt(getItemCount() - 1); 
     } 

     public void load(String fName) { 
     try { 
      if (getItemCount() > 0) 
      removeAllItems(); 
      File f = new File(fName); 
      if (!f.exists()) 
      return; 
      FileInputStream fStream = new FileInputStream(f); 
      ObjectInput stream = new ObjectInputStream(fStream); 

      Object obj = stream.readObject(); 
      if (obj instanceof ComboBoxModel) 
      setModel((ComboBoxModel) obj); 

      stream.close(); 
      fStream.close(); 
     } catch (Exception e) { 
      System.err.println("Serialization error: " + e.toString()); 
     } 
     } 

     public void save(String fName) { 
     try { 
      FileOutputStream fStream = new FileOutputStream(fName); 
      ObjectOutput stream = new ObjectOutputStream(fStream); 

      stream.writeObject(getModel()); 

      stream.flush(); 
      stream.close(); 
      fStream.close(); 
     } catch (Exception e) { 
      System.err.println("Serialization error: " + e.toString()); 
     } 
     } 
    } 

Answer 1

看起来Jquery在这种情况下会派上用场。你可以做简单的检查，当添加按钮，用户点击，你去取字段的当前值，使用Javascript/jQuery的，你把它添加到您的选择框：

<input type="text" class="addingElement"> 
<button class="addingButton">Add</button> 
<select name="event_title" id="event_title" class="form-control required"> 
    <option value="BERASI"> BERASI</option> 
    <option value="BERGHOFF"> BERGHOFF</option> 
    <option value="BIGGS"> BIGGS</option> 
    <option value="BORUS"> BORUS</option> 
    <option value="BURKE"> BURKE</option> 
    <option value="CANNONE"> CANNONE</option> 
    <option value="DEARBORN"> DEARBORN</option> 
</select> 
<script> 
$(document).ready(function(){ 
    $('.addingButton').on('click', function(){ 
     var newElement = $('.addingElement').val(); 
     $('#event_title').append('<option></option>').attr('value', newElement).html(newElement); 
    }) 
}); 
</script>