jquery drag and drop delete tr td

jQuery is a popular JavaScript library used to simplify writing and processing JavaScript code. Among them, drag and drop is one of the common functions of web applications, which can improve website interactivity and user experience. jQuery's drag-and-drop method is particularly useful when implementing the drag-and-drop function of tables on a website.

1. Requirements Analysis

To realize the function of deleting rows and columns in the table through drag and drop, we need to conduct the following requirements analysis:

1. You need to add mouse movement events to each row and column in the table to implement drag and drop operations;
2. When the mouse moves on a row or column, there needs to be a prompt effect to let the user know that they are dragging the mouse. Object;
3. When the mouse drags a row or column, it is necessary to determine the relationship between the mouse position and other rows or columns in the table to achieve the deletion operation.

2. Implementation method

Based on the demand analysis, we can use the following method to implement the table drag and drop function:

1. In HTML Adding rows and columns in

We can use HTML's and tags to create tables and add id attributes to each row and column. When implementing the table drag and drop function, the id attribute of the row or column can be used to determine the position and delete.

For example:

<table id="myTable">
  <tr id="row1">
    <td>......</td>
  </tr>
  <tr id="row2">
    <td>......</td>
  </tr>
  <tr id="row3">
    <td>......</td>
  </tr>
  ......
</table>

2. jQuery drag and drop method

jQuery provides the draggable() method, which can easily implement dragging Drag function. We just need to add this method for each row or column.

For example:

$('#row1').draggable();

3. Judge the mouse position

The core of realizing the drag and drop function is how to judge the mouse position and other rows or columns in the table Positional relationship. We can use jQuery's offset() method to obtain the absolute position of each row or column, and then calculate the positional relationship between the mouse position and the dragged object.

For example:

var row1 = $('#row1').offset().top;
var row2 = $('#row2').offset().top;
var row3 = $('#row3').offset().top;
var mouse = event.pageY;
if (mouse > row1 && mouse < row2) {
  console.log('鼠标在第一行和第二行之间');
}

4. Realize the movement prompt effect

In the process of implementing the drag and drop function, we can set the dragging object’s style to achieve the prompt effect. For example, when a row is dragged, we can set the transparency of the dragged row to achieve a translucent prompt effect for the row.

For example:

$('#row1').draggable({
  helper: 'clone', // clone方式，拖动时保留原行
  opacity: 0.6, // 设置半透明
  cursor: 'move' // 设置移动时鼠标样式
});

5. Realize the deletion operation

After judging the mouse position relationship, we can use the remove() method to delete the dragged row or column from the table. For example:

$('#row1').draggable({
  stop: function(event, ui) {
    if (mouse > row1 && mouse < row2) {
      $(this).remove();
    }
  }
});

It should be noted that before performing the deletion operation, we need to determine how many rows or columns there are in the table to ensure that there will be no blank rows or columns in the table.

3. Conclusion

Through the above implementation method, we can easily implement the table drag and drop function. In addition, jQuery has many other practical methods that can help us develop excellent web applications and improve user experience and interactivity. Learning and mastering jQuery is crucial for those engaged in web development.

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