Question

我想你已经在这里被问了1000次，但是我已经完成了我的作业而且由于某些原因我似乎无法将我的容器div放到中心，我想知道你是否可以请帮我解决我出错的地方。我尝试了几种不同的方法将它与中心对齐我将把我尝试过的代码放在下面，但首先我要确认网站设置。容器div包含所有其他div（惊喜），但是我已经用asbolute值设置了很多div，然后用像素值定位它们，并想知道这是否影响容器div对齐。

body {
    margin: 0;
    padding: 0;
    text-align: center;
}
#container {
    width:2504px;
    margin: 0 auto;
    text-align: left;
}

body {
    margin-right: auto;
    margin-left: auto;
    text-align: center;
}
#container {
    width: 2504px;
    margin-right: auto;
    margin-left: auto;
    text-align: left;
}

提前感谢您提供任何帮助

Answer 1

假设您有body > div要将后者div置于中心位置，那么这样的事情应该有效：

body { width: 100%; margin: 0; }
body > div { width: 100%; margin: 0 auto; max-width: 2504px; }

Answer 2

如果您已经有这样的话，那就足够了。

<body>
<div id="container"></div>
</body>


#container {
width: 2504px;
margin-right: auto;
margin-left: auto;
text-align: left;
}

Answer 3

现在我可以看到该网站，这应该适合您：

import java.awt.*;
import javax.swing.*;
import java.text.DecimalFormat;
import java.awt.event.*;
import javax.swing.JOptionPane;

public class TravelExpenses extends JFrame{

    //info for labels
    private JLabel daysOnTrip;
    private JLabel carRental;
    private JLabel airfair;
    private JLabel parkingFees;
    private JLabel taxiFees;
    private JLabel milesDriven;
    private JLabel conReg;
    private JLabel lodgingNightCharges;

    //reference panel obs
    private JPanel travelInfo;
    private JPanel buttonP;

    //info from fields of texts
    private JTextField daysOnTripText;
    private JTextField carRentalText;
    private JTextField airfairText;
    private JTextField parkingFeesText;
    private JTextField taxiFeesText;
    private JTextField milesDrivenText;
    private JTextField conRegText;
    private JTextField lodgingNightChargesText;

    //buttons that will be used to function 
    private JButton calculate; //will be used to calculate informaiton that the user enters when clicked
    private JButton reset; // will be used to reset the fields as needed when clicked

    //constants as specified 
    private double mealsCost = 37.00; //per day for meals
    private double parkingFeesAmount = 10.00; // up to 10 per day
    private double taxiFeesAmount = 20.00; // up to 20 per day
    private double lodgingChargesAmount = 95.00; // up to 95 a day
    private double mileAmount = 0.27; //per mile driven

    /**
     * Constructor 
     * @param args
     */

    public TravelExpenses(){
        //JFrame title called
        super("Travel Expenses");

        //center of desktop placement
        setLocationRelativeTo(null);

        //Close button will do this..
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //border layout mgr cp
        setLayout(new BorderLayout());

        //TravelInfo&Buttons
        buildTravelInfoPanel();
        buildButton();

        // get panels to frame content
        add(travelInfo, BorderLayout.CENTER);
        add(buttonP, BorderLayout.SOUTH);

        //window content display
        pack();
        setVisible(true);
    }
    private void buildTravelInfoPanel(){
        //field labels made
        daysOnTrip = new JLabel("Number of days for trip.");
        airfair = new JLabel("Airfair Amount: ");
        carRental = new JLabel ("Car Rental Cost Amount: ");
        milesDriven = new JLabel ("Mile Driven: ");
        parkingFees = new JLabel ("Parking Fees: ");
        taxiFees = new JLabel ("Taxi Fees: ");
        conReg = new JLabel ("Conference Registration Cost: ");
        lodgingNightCharges =  new JLabel ("Lodging Charges per Night: ");

        //text boxes for input from user
        daysOnTripText = new JTextField(3);
        carRentalText = new JTextField(8);
        airfairText = new JTextField(8);
        parkingFeesText = new JTextField(6);
        taxiFeesText = new JTextField(6);
        milesDrivenText = new JTextField(4);
        conRegText = new JTextField(8);
        lodgingNightChargesText = new JTextField(6);

        //panel for labels/text
        travelInfo = new JPanel();


        //Grid for 10 r and 2 c
        travelInfo.setLayout(new GridLayout(10,2));



        //labels and text for panel made
        travelInfo.add(daysOnTrip);
        travelInfo.add(daysOnTripText);
        travelInfo.add(airfair);
        travelInfo.add(airfairText);
        travelInfo.add(carRental);
        travelInfo.add(carRentalText);
        travelInfo.add(milesDriven);
        travelInfo.add(milesDrivenText);
        travelInfo.add(parkingFees);
        travelInfo.add(parkingFeesText);
        travelInfo.add(taxiFees);
        travelInfo.add(taxiFeesText);
        travelInfo.add(conReg);
        travelInfo.add(conRegText);
        travelInfo.add(lodgingNightCharges);
        travelInfo.add(lodgingNightChargesText);


    }

    /**
     * buildButton is method that adds reset and calc buttons to main panel
     * @param args
     */

    private void buildButton(){
        //caclulation button

        calculate = new JButton("Calculate Reimbursment");

        //event listiner for calculation
        calculate.addActionListener(new CalculateListener());

        //reset button
         reset = new JButton("Reset");

        //event listiner for reset
        reset.addActionListener(new ResetListener());

        //button panels
        buttonP = new JPanel();

        //buttons 
        buttonP.add(reset, BorderLayout.WEST);
        buttonP.add(calculate, BorderLayout.CENTER);





    }

    /**
     * CalculateListener will  do event for calculate button
     * @param args
     */

    private class CalculateListener implements ActionListener{
        //variables
        String input;
        int days;
        double air;
        double miles;
        double carRental;
        double conReg;
        double lodging;
        double parking;
        double meals;
        double taxi;

        public void actionPerformed(ActionEvent e){
            //variables
            double actualExpenses;
            double milesExpenses;
            double allowed;
            double exAirfair;
            double exCarRen;
            double exParking;
            double exTaxi;
            double exLodge;
            double overTotal;
            double savings;
            double reimb;

            //dec format implement
            DecimalFormat money = new DecimalFormat("$#,###.00");
        }
        //get info from text fields
        private void getInfo(){
            days = Integer.parseInt(daysOnTripText.getText());
            air = Double.parseDouble(airfairText.getText());
            carRental = Double.parseDouble(carRentalText.getText());
            miles = Double.parseDouble(milesDrivenText.getText());
            parking = Double.parseDouble(parkingFeesText.getText());
            taxi = Double.parseDouble(parkingFeesText.getText());
            conReg = Double.parseDouble(conRegText.getText());
            lodging = Double.parseDouble(lodgingNightChargesText.getText());

        }
        //figure out expenses
        private void calcActualExpenses(double actualExpenses, double milesExpenses){
            actualExpenses = air + carRental + parking + taxi + conReg + lodging;
            milesExpenses = miles * mileAmount;
            actualExpenses = actualExpenses + milesExpenses;


            //display total
            JOptionPane.showMessageDialog(null, "Total expenses: " + "\n"+
                    "Allowables expenses: " + "\n" +
                    "\n" + "Amount to be paid back: ");


        }


    }

    //this handles reset button
    private class ResetListener implements ActionListener{
        public void actionPerformed(ActionEvent e){
            daysOnTripText.setText("");
            airfairText.setText("");
            carRentalText.setText("");
            milesDrivenText.setText("");
            parkingFeesText.setText("");
            taxiFeesText.setText("");
            conRegText.setText("");
            lodgingNightChargesText.setText("");
        }
    }


    public static void main(String[] args) {
        new TravelExpenses();
    }

}

Answer 4

您需要将position: relative添加到#container CSS以获取自动边距，以充当水平居中。如果#container DIV在另一个元素中，那么该元素也需要相对或绝对定位。

容器div不居中

4 个答案: