使动态棋盘响应用户输入jQuery



我正在处理一个编码挑战,要求我使用jQuery创建一个棋盘,以及一个输入表格,询问游戏板的大小(即6x6板、7x7板等)。每当输入是奇数(即7x7板、9x9板、11x11板)时,我都很难分配奇数/偶数类。如果在将输入#增加到任意奇数时运行JS fiddle,则奇数/偶数赋值将"跳过"。

$(document).ready(function() {
    
  //create input form for number/size of board
  $('h1').append('<div class=div1>Size of Board: <input type="text" id = "size1" name="size2" min = "2" max = "100" step = "2" value = "6"><input type="submit" id="submit1" value="Create"></div>')
 
  //create button to print Game Pieces 
  $('h1').append('<div><input type="submit" id="submitForm" value="Lets Play!"></div>');
  
  
  var z = '';
  //on clicking the button, create array of empty boxes/<td>
  $('#submit1').click(function() {
    var array = [];
    //remove previous appended array
    $('tbody').empty();
    //grab current value or size of gameboard
    z = $('#size1').val();
    
      //with a for loop, create "empty" table (z by z) of boxes
      for (var i=0; i<z; i++) {
        //addClass so we can grab later for color assignment
        var trEven = $('<tr>').addClass('trEven');
        var trOdd = $('<tr>').addClass('trOdd');
        //Differentiate between row to row: assign class trEven and trOdd to every other row      
        if (i%2 == 0) {
          array.push(trEven);
        }
        else {
          array.push(trOdd);
        }
        //for each row add z number of td's
          for (var j=0; j<z; j++) {
            array[i].append('<td></td>');
          }
      } 
    //append updated array to <tbody>
    $('tbody').append(array);
    //select all evens/odds of trOdd/trEven to assign colors using special selectors
    $('.trOdd td:odd').css('background-color', 'black'); 
    $('.trOdd td:even').css('background-color', 'white'); 
    $('.trEven td:odd').css('background-color', 'white');
    $('.trEven td:even').css('background-color', 'black'); 
  });//onclick function
  
  
  //Play Button: add game pieces
  $('#submitForm').click(function(){
    if (z <= 6) {
      //first two rows
      $('#gameBoard tr:eq(0) td:odd').append('<div class="gamePiece">')
      $('#gameBoard tr:eq(1) td:even').append('<div class="gamePiece">')
      //last two rows
      $('#gameBoard tr:last td:even').append('<div class="gamePiece">')
      $('#gameBoard tr:nth-last-child(2) td:odd').append('<div class="gamePiece">')
    }
    else if (z > 6) {
	  //first three rows
      $('#gameBoard tr:eq(0) td:odd').append('<div class="gamePiece">')
      $('#gameBoard tr:eq(1) td:even').append('<div class="gamePiece">')
      $('#gameBoard tr:eq(2) td:odd').append('<div class="gamePiece">')
      //last three rows
      $('#gameBoard tr:last td:even').append('<div class="gamePiece">')
      $('#gameBoard tr:nth-last-child(2) td:odd').append('<div class="gamePiece">')
      $('#gameBoard tr:nth-last-child(3) td:even').append('<div class="gamePiece">') 
    }
  })//onclick function
  
  
})//document
table {
  border: solid 1px black;
  border-spacing: 0px;
}
td {
  width: 50px;
  height: 50px;
}
.div1 {
  font-size: medium;
}
.gamePiece {
  border-radius: 100%;
  height: 100%;
  width: 100%;
  background-color: red;
}
<!DOCTYPE html>
<body>
  <h1>Game Board</h1>
  <table id="gameBoard">
    <tbody></tbody>
  </table>
  <script src="https://code.jquery.com/jquery-2.1.4.min.js"></script>
</body>

如果您调出检查器工具,单击"跳过"行(例如第三行)并将其与第一行进行比较,则两行都被识别为"偶数"行,但第一个td元素不同。第1行的第一个td/"列"被拉为td:even。然而,第三行的第一个td/"列"被拉为td:odd。据我所知,似乎在每对行(1奇数行和1偶数行)之后,索引都会跳过,第一列应该是"0",而它是"1"。只有当电路板尺寸为奇数时才会出现这种情况。

有人知道为什么跳过索引吗?

使用布尔标志来确定分配类的位置怎么样?

首先,在"创建"按钮点击处理程序中声明一个布尔变量:

var toggleFlag = true;

然后,在您的for循环中,您"计算"每行中td的数量,您可以立即分配一个类:

//for each row add z number of td's
for (var j = 0; j < z; j++) {
    if(toggleFlag){
        array[i].append('<td class="odd"></td>');
    }else{
        array[i].append('<td class="even"></td>');
    }
    // Toggle the flag for next iteration
    toggleFlag=!toggleFlag;
}

这个循环一结束,就检查每行上是否应该有奇数或偶数的td。。。因为如果它很奇怪,你必须再次切换:

// If rows contain an even amout of td, toggle again before looping to next row
if(z % 2 == 0){
    toggleFlag=!toggleFlag;
}

最后,当您点击"Let's play"按钮添加片段时,您可以使用奇数类而不是:odd:even选择器来选择td

$('#gameBoard tr:nth-last-child(3) td.odd').append('<div class="gamePiece">')

查看此工作CodePen
;)


编辑以解释初始错误

代码中的错误位于以下行:

$('.trOdd td:odd').css('background-color', 'black'); 
$('.trOdd td:even').css('background-color', 'white'); 
$('.trEven td:odd').css('background-color', 'white');
$('.trEven td:even').css('background-color', 'black'); 

这种逻辑适用于偶数平方
但如果是奇数,你会致命地得到一个抵消

这就是这种"二乘二"行分组效果的原因
所以你必须有这个代码块的"交替逻辑"。。。在每一行
这并不简单
这就是为什么我在代码的早期就解决了这个问题,在循环中逐个分配循环td的类。

为了说明这一点,我制作了另一个CodePen
它清楚地表明,该选择器$('.trOdd td:odd')选择了在奇tr中具有奇类的ALLtd但不仅仅是在一排我相信你在想。。。它不像人类那样一排排地排列。它抓取所有的表来收集匹配的元素。

看到了吗?对于jQuery,只有两行(trOddtrEven
;)

这一切都与CSS有关。尝试突出JS将类分配给奇数和偶数元素,但使用CSS来选择正确的元素。

$(document).ready(function() {
    //create input form for number/size of board
    $('h1').append('<div class=div1>Size of Board: <input type="text" id = "size1" name="size2" min = "2" max = "100" step = "2" value = "6"><input type="submit" id="submit1" value="Create"></div>')
    //create button to print Game Pieces 
    $('h1').append('<div><input type="submit" id="submitForm" value="Lets Play!"></div>');
    var z = '';
    //on clicking the button, create array of empty boxes/<td>
    $('#submit1').click(function() {
      var array = [];
      //remove previous appended array
      $('tbody').empty();
      //grab current value or size of gameboard
      z = $('#size1').val();
      //with a for loop, create "empty" table (z by z) of boxes
      for (var i = 0; i < z; i++) {
        //addClass so we can grab later for color assignment
        var trEven = $('<tr>').addClass('trEven');
        var trOdd = $('<tr>').addClass('trOdd');
        //Differentiate between row to row: assign class trEven and trOdd to every other row      
        if (i % 2 == 0) {
          array.push(trEven);
        } else {
          array.push(trOdd);
        }
        //for each row add z number of td's
        for (var j = 0; j < z; j++) {
          array[i].append('<td></td>');
        }
      }
      //append updated array to <tbody>
      $('tbody').append(array);
      //select all evens/odds of trOdd/trEven to assign colors using special selectors
      $('.trOdd td:odd').addClass('even');
      $('.trOdd td:even').addClass('odd');
      $('.trEven td:odd').addClass('odd');
      $('.trEven td:even').addClass('even');
    }); //onclick function
    //Play Button: add game pieces
    $('#submitForm').click(function() {
        if (z <= 6) {
          //first two rows
          $('#gameBoard tr:eq(0) td:odd').append('<div class="gamePiece">')
          $('#gameBoard tr:eq(1) td:even').append('<div class="gamePiece">')
            //last two rows
          $('#gameBoard tr:last td:even').append('<div class="gamePiece">')
          $('#gameBoard tr:nth-last-child(2) td:odd').append('<div class="gamePiece">')
        } else if (z > 6) {
          //first three rows
          $('#gameBoard tr:eq(0) td:odd').append('<div class="gamePiece">')
          $('#gameBoard tr:eq(1) td:even').append('<div class="gamePiece">')
          $('#gameBoard tr:eq(2) td:odd').append('<div class="gamePiece">')
            //last three rows
          $('#gameBoard tr:last td:even').append('<div class="gamePiece">')
          $('#gameBoard tr:nth-last-child(2) td:odd').append('<div class="gamePiece">')
          $('#gameBoard tr:nth-last-child(3) td:even').append('<div class="gamePiece">')
        }
      }) //onclick function
  }) //document
table {
  border: 1px solid #000;
}
td {
  background-color: #fff;
  height: 50px;
  width: 50px;
}
td:nth-child(2n) {
  background-color: #000;
}
tr:nth-child(2n) td {
  background-color: #000;
}
tr:nth-child(2n) td:nth-child(2n) {
  background-color: #fff;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<h1>Game Board</h1>
  <table id="gameBoard">
    <tbody></tbody>
  </table>

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