d3.js selection.filter()用法及代碼示例

d3.js中的d3.selection.filter()函數用於過濾給定的選擇並返回其過濾器為true的新選擇。要使用的過濾器可以是字符串或函數。

用法:

selection.filter(filter);

參數：該函數接受上麵提到並在下麵描述的一個參數：

filter:它是一個字符串或一個函數，用於過濾選擇。使用函數時，過濾器將應用於每個選定的元素。

返回值：此函數返回新選擇。

範例1：本示例選擇指定元素的所有奇數子代。

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8"> 
    <meta name="viewport" content= 
        "width=device-width,initial-scale=1.0"> 
      
    <script src= 
        "https://d3js.org/d3.v4.min.js"> 
    </script> 
    <script src= 
        "https://d3js.org/d3-selection.v1.min.js"> 
    </script> 
</head> 
  
<body> 
    <div> 
        <b>1. This text is in bold</b> 
        <b>2. This text is also in bold</b> 
        <b>3. Geeks for geeks</b> 
        <b>4. Geeks for geeks</b> 
        <b>5. Geeks for geeks</b> 
    </div> 
     
    <script> 
        let selection = d3.selectAll("b") 
            .filter(":nth-child(odd)") 
            .nodes(); 
        selection.forEach((e) => { 
            console.log(e.textContent) 
        }) 
    </script> 
</body> 
  
</html>

輸出：

範例2：本示例選擇指定元素的所有偶數子代。

HTML

<!DOCTYPE html> 
<html lang="en"> 
  
<head> 
    <meta charset="UTF-8"> 
    <meta name="viewport" content= 
        "width=device-width,initial-scale=1.0"> 
    <script src= 
        "https://d3js.org/d3.v4.min.js"> 
    </script> 
    <script src= 
        "https://d3js.org/d3-selection.v1.min.js"> 
    </script> 
</head> 
  
<body> 
    <div> 
        <b>1. This text is in bold</b> 
        <b>2. This text is also in bold</b> 
        <b>3. Geeks</b> 
        <b>4. Geeks</b> 
        <b>5. Geeks for geeks</b> 
    </div> 
      
    <script> 
        let selection = d3.selectAll("b") 
            .filter(":nth-child(even)") 
            .nodes(); 
        selection.forEach((e) => { 
            console.log(e.textContent) 
        }) 
    </script> 
</body> 
  
</html>

輸出：

範例3：本示例使用selection.selectAll作為過濾器。

HTML

<!DOCTYPE html> 
<html> 
  
<head> 
    <meta charset="UTF-8"> 
    <meta name="viewport" content= 
        "width=device-width, initial-scale=1.0"> 
  
    <script src= 
        "https://d3js.org/d3.v4.min.js"> 
    </script> 
    <script src= 
        "https://d3js.org/d3-selection.v1.min.js"> 
    </script> 
</head> 
  
<body> 
    <div> 
        <h3>1. This text is in bold</h3> 
        <h3>2. This text is also in bold</h3> 
        <h3>3. Geeks</h3> 
        <h3>4. Geeks</h3> 
        <h3>5. Geeks for geeks</h3> 
    </div> 
      
    <script> 
  
        // Using selection.selectAll with filter 
        let selection = d3.selectAll("div") 
            .selectAll("h3") 
            .filter(":nth-child(even)") 
            .nodes(); 
        selection.forEach((e) => { 
            console.log(e.textContent) 
        }) 
    </script> 
</body> 
  
</html>

輸出：

相關用法

注：本文由純淨天空篩選整理自tarun007大神的英文原創作品 D3.js selection.filter() Function。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。