📜  p5.js | p5.Table clearRows() 方法

📅  最后修改于: 2022-05-13 01:56:45.530000             🧑  作者: Mango

p5.js | p5.Table clearRows() 方法

p5.js 中 p5.Table 的clearRows() 方法用于清除表中的所有行。它不影响列及其标题。它可用于清除表而不影响其列结构。它没有参数。
句法:

clearRows()

参数:此函数没有参数。
下面的示例说明了 p5.js 中的clearRows()函数
例子:

javascript
function setup() {
  createCanvas(500, 300);
  textSize(16);
  
  getColBtn = createButton("Get Table Row Details");
  getColBtn.position(30, 50);
  getColBtn.mouseClicked(getTableRows);
  
  getColBtn = createButton("Clear Rows");
  getColBtn.position(30, 80);
  getColBtn.mouseClicked(clearAllRows);
  
  text("Click on the button to clear the"+
       " rows in the table", 20, 20);
  
  // Create the table
  table = new p5.Table();
  
  // Add columns
  table.addColumn("author");
  table.addColumn("book");
  
  // Add two rows
  let newRow = table.addRow();
  newRow.setString("author", "Marcel Proust");
  newRow.setString("book", "In Search of Lost Time");
  
  newRow = table.addRow();
  newRow.setString("author", "James Joyce");
  newRow.setString("book", "Ulysses");
}
  
function clearAllRows() {
  clear();
  text("Click on the button to clear"+
       " the rows in the table", 20, 20);
    
  // Use the clearRow() method to
  // clear all rows in the table
  table.clearRows();
  
  text("All rows cleared!", 20, 140);
}
  
function getTableRows() {
  clear();
  text("Click on the button to clear the rows "+
       "in the table", 20, 20);
  
  // Display all the rows present in the table
  text("There are " + table.getRowCount() + 
       " rows in the table", 20, 140);
  for (let i = 0; i < table.getRowCount(); i++) {
    let rowContents = table.rows[i].arr.toString();
    text("Row " + i + ": " + rowContents, 20, 160 + i * 20);
  }
}


输出:

clearRows-btn

在线编辑器: https://editor.p5js.org/
环境设置: https://www.geeksforgeeks.org/p5-js-soundfile-object-installation-and-methods/
参考: https://p5js.org/reference/#/p5.Table/clearRows