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Simpan kedudukan DIV boleh seret dalam jadual HTML dan simpan ke pangkalan data MySQL

Saya tertanya-tanya sama ada/bagaimana saya boleh menyimpan kedudukan yang saya alihkan div boleh seret ke atas meja, jadi apabila halaman dimuat semula ia akan kembali ke tempat ia berhenti (dari pangkalan data MySQL).

Saya telah membaca beberapa artikel berkaitan, tetapi semuanya tentang menggunakan jquery (acara, ui) dengan AJAX.

Ini kod saya:

   var p = document.getElementsByTagName('p');
   var choice = document.getElementsByClassName('choice');
   var dragItem = null;
   
   for(var i of p){
        i.addEventListener('dragstart', dragStart);
        i.addEventListener('dragend', dragEnd);
   }
   function dragStart(){
        dragItem = this;
        setTimeout(()=>this.style.display = "none", 0);
   }
   function dragEnd(){
        setTimeout(()=>this.style.display = "block", 0);
        dragItem = null;
   }
   for(j of choice){
        j.addEventListener('dragover', dragOver);
        j.addEventListener('dragenter', dragEnter);
        j.addEventListener('dragleave', dragLeave);
        j.addEventListener('drop', Drop);
   }
   function Drop(){
        this.append(dragItem);
   }
   function dragOver(e){
        e.preventDefault();
        this.style.border = "2px dotted cyan";
   }
   function dragEnter(e){
        e.preventDefault();
   }
   function dragLeave(e){
        this.style.border = "none";
   }
   section{
      width: 1000px;
      height: 360px;
      margin: 100px auto;
      display: flex;
      justify-content: space-around;
   }
   h1{
      text-align: center;
   }
   div{
      width: 200px;
      height: 90%;
      padding: 20px;
      margin: 10px;
      background: #fafafa;
      box-sizing: border-box;
   }
   p{
      font-weight: bold;
      border-radius: 5px;
      padding: 5px;
      color: white;
      background: red;
   }
   table, th, td {
  border:1px solid black;
}
      button{
      width: 100px;
      height: 15px;
      padding: 15px;
      margin: 10px;
      background: gray;
      box-sizing: border-box;
   }
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>test drag & drop </title>
</head>
<body>
<h1> it's just a test for js </h1>
<section>
<div2>
 <table  style="width:100%">
  <tr>
    <th>time</th>
    <th>DIM</th>
    <th>LUN</th>
  </tr>
  <tr>
    <td>8:00 - 9:00</td>
    <td><div class="choice"></div> S1-1</td>
    <td><div class="choice"></div>S1-2</td>
  </tr>
  <tr>
    <td>9:00 - 10:00</td>
    <td><div class="choice"></div>S2-1</td>
    <td><div class="choice"></div>S2-2</td>
  </tr>
</table> 
<button>save</button>
</div2>
<div class="choice">
     <p draggable="true">MODULE 1</p>
     <p draggable="true">MODULE 2</p>
     <p draggable="true">MODULE 3</p>
     <p draggable="true">MODULE 4</p>
     <p draggable="true">MODULE 5</p>
</div>

</section>
</body> 
</html>

P粉909476457P粉909476457380 hari yang lalu423

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  • P粉729436537

    P粉7294365372024-02-04 16:28:41

    Ini mungkin jawapan yang terlalu rumit. Tetapi saya rasa cara terbaik ialah menyimpan module 对象的数组。每个 module 都有一个 position 属性,每次移动模块时都需要更新该属性。您还可以使用 data atribut html dalam JavaScript untuk menyimpan kedudukan elemen itu sendiri pada elemen (https://developer.mozilla.org/en-US/docs/Learn/HTML/Howto/Use_data_attributes ). Ini kod saya:

    Javascript:

    var dragItem = null;
    let modules = loadDataFromServer();
    
    //Initial UI
    updateUI(modules);
    
    
    function dragStart() {
        console.log("Start")
        dragItem = this;
        setTimeout(() => this.style.display = "none", 0);
    }
    function dragEnd() {
        console.log("End")
        setTimeout(() => this.style.display = "block", 0);
        dragItem = null;
    }
    
    function Drop() {
        console.log("Drop")
        console.log(dragItem)
        this.append(dragItem);
        moveModuleTo(modules.length - 1, modules[dragItem.dataset.position])
    }
    function dragOver(e) {
        e.preventDefault();
        this.style.border = "2px dotted cyan";
    }
    function dragEnter(e) {
        e.preventDefault();
    }
    function dragLeave(e) {
        this.style.border = "none";
    }
    
    //Added Code
    
    function loadDataFromServer() {
        //return an array of modules
        return [
            {
                title: "Module 1",
                position: 0
            },
            {
                title: "Module 2",
                position: 1
            },
            {
                title: "Module 3",
                position: 2
            },
            {
                title: "Module 4",
                position: 3
            },
            {
                title: "Module 5",
                position: 4
            },
        ]
    }
    
    function moveModuleTo(position, module) {
        if (module.position < position) {
            //Module is moving down the list
            console.log(position)
            console.log(module.position)
            for (let i = module.position; i < position; i++) {
                modules[i] = modules[i + 1];
                modules[i].position = i
            }
        } else {
            //Module is moving up the list
            for (let i = module.position - 1; i > position; i--) {
                modules[i] = modules[i - 1]
                modules[i].position = i + 1;
            }
        }
        modules[position] = module
        modules[position].position = position
        console.log(modules)
        //Update UI and database
        updateUI(modules)
    }
    
    function updateUI(modules) {
        let choice = document.getElementsByClassName('choice');
    
        //Remove old Modules
        const draggableContainer = document.getElementById("draggableContainer")
        while (draggableContainer.firstChild) {
            draggableContainer.removeChild(draggableContainer.lastChild)
        }
    
        //Add updated Modules
        modules.forEach(item => {
            console.log("yeet")
            let newDraggableItem = document.createElement('p')
            newDraggableItem.innerHTML = `${item.title}`
            newDraggableItem.draggable = true
            newDraggableItem.dataset.position = item.position
            draggableContainer.appendChild(newDraggableItem);
        });
    
        //ReAdd Event listeners
    
        var p = document.getElementsByTagName('p');
    
        for (var i of p) {
            i.addEventListener('dragstart', dragStart);
            i.addEventListener('dragend', dragEnd);
        }
    
        for (j of choice) {
            j.addEventListener('dragover', dragOver);
            j.addEventListener('dragenter', dragEnter);
            j.addEventListener('dragleave', dragLeave);
            j.addEventListener('drop', Drop);
        }
    }
    

    HTML:

    
    
    
        
        
        
        test drag & drop 
    
    
        

    it's just a test for js

    time DIM LUN
    8:00 - 9:00
    S1-1
    S1-2
    9:00 - 10:00
    S2-1
    S2-2
    sssccc

    Untuk mengemas kini pangkalan data, anda boleh mengisih tatasusunan mengikut nilai write 数据库调用。然后每次加载页面时,只需根据 position setiap kali anda mengalihkan modul. Harap ini membantu!

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