p5.js | p5.Table removeRow() 方法

p5.js 中 p5.Table 的removeRow() 方法用于从表中删除给定的行。要删除的行是使用其行 ID 指定的。

句法：

removeRow( id )

参数：此函数接受如上所述和如下所述的单个参数：

• id：它是一个数字，表示要删除的行的 ID。

下面的示例说明了 p5.js 中的removeRow()函数：

示例 1：

function setup() {
  createCanvas(500, 400);
  textSize(16);
  
  rowInput = createInput();
  rowInput.position(30, 40);
  
  clearRowBtn = createButton("Clear Given Row");
  clearRowBtn.position(30, 70);
  clearRowBtn.mouseClicked(clearRow);
  
  // Create the table
  table = new p5.Table();
  
  // Add columns
  table.addColumn("author");
  table.addColumn("book");
  
  // Add 10 random rows to the table
  for (let i = 0; i < 10; i++) {
    let newRow = table.addRow();
    newRow.setString("author", "Author " + floor(random(1, 100)));
    newRow.setString("book", "Book " + floor(random(1, 100)));
  }
  
  // Display the rows currently present
  getTableRows();
}
  
function clearRow() {
  clear();
  text("Click on the button to clear the given row in the table", 20, 20);
  
  // Get the index of the row to be removed
  let rowToClear = int(rowInput.value());
  
  // Use the removeRow() method to
  // clear the given row of the table
  if (rowToClear >= 0 && rowToClear < table.getRowCount())
    table.removeRow(rowToClear);
  
  text("Last row cleared!", 20, 140);
  getTableRows();
}
  
function getTableRows() {
  clear();
  text("Click on the button to clear the given row in the table", 20, 20);
  
  // Display all the rows present in the table
  text("There are " + table.getRowCount() + " rows in the table", 20, 120);
  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：

示例 2：

function setup() {
  createCanvas(500, 400);
  textSize(16);
  
  removeRowBtn = createButton("Clear Last Row");
  removeRowBtn.position(30, 60);
  removeRowBtn.mouseClicked(clearLastRow);
  
  // Create the table
  table = new p5.Table();
  
  // Add columns
  table.addColumn("author");
  table.addColumn("book");
  
  // Add 10 random rows to the table
  for (let i = 0; i < 10; i++) {
    let newRow = table.addRow();
    newRow.setString("author", "Author " + floor(random(1, 100)));
    newRow.setString("book", "Book " + floor(random(1, 100)));
  }
  
  // Display the rows currently present
  getTableRows();
}
  
function clearLastRow() {
  clear();
  text("Click on the button to clear the last row in the table", 20, 20);
  
  // Get the index of the last row
  // of the table
  let lastRow = table.getRowCount() - 1;
  
  // Use the removeRow() method to
  // clear the given row of the table
  if (lastRow >= 0) table.removeRow(lastRow);
  
  text("Last row cleared!", 20, 140);
  getTableRows();
}
  
function getTableRows() {
  clear();
  text("Click on the button to clear the last row in the table", 20, 20);
  
  // Display all the rows present in the table
  text("There are " + table.getRowCount() + " rows in the table", 20, 120);
  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：

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/removeRow