如何在数据表中创建进度条？

问题描述 投票：0回答：1

我目前正在处理包含大量数据（5000+）的数据表。为了能够加载有进度的数据，我添加了一个进度条，说明在每个时间单位内加载了多少数据。但是下面的代码不再有效了。

let handleProgressBar = (id, value, total) => {
    let percent = Math.round((value / total) * 10000) / 100;
    $(id + " > div").html(percent + "%");
    $(id + " > div").css('width', percent + "%");
}

let table = $('#data').DataTable();

fetch('https://jsonplaceholder.typicode.com/photos')
.then((res) => res.json())
.then((res) => {
  res.forEach(async(data, index)=>{
    table.row.add([
      data.id,
      data.albumId,
      data.title,
      data.url
    ]);
    handleProgressBar('#progress-bar', index+1, res.length);
    await new Promise(r => setTimeout(r, 1)); // sleep 1 ms
  });
  table.draw();
});
.progress-bar-striped {
    overflow: hidden;
    height: 20px;
    margin-bottom: 20px;
    background-color: #f5f5f5;
    border-radius: 4px;
    -webkit-box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
    -moz-box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
}

.progress-bar-striped>div {
    background-image: linear-gradient(45deg, rgba(255, 255, 255, 0.15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, transparent 75%, transparent);
    background-size: 40px 40px;
    float: left;
    width: 0%;
    height: 100%;
    font-size: 12px;
    line-height: 20px;
    color: #000000;
    font-weight: bold;
    text-align: center;
    -webkit-box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.15);
    -moz-box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.15);
    box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.15);
    /*-webkit-transition: width 3s ease;
    -moz-transition: width 3s ease;
    -o-transition: width 3s ease;
    transition: width 3s ease;*/
    animation: progress-bar-stripes 2s linear infinite;
    background-color: #288ade;
}

.progress-bar-striped p {
    margin: 0;
}

@keyframes progress-bar-stripes {
    0% {
        background-position: 40px 0;
    }
    100% {
        background-position: 0 0;
    }
}
<link href="https://cdn.datatables.net/1.13.4/css/jquery.dataTables.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdn.datatables.net/1.13.4/js/jquery.dataTables.min.js"></script>

<div id="progress-bar" class="progress-bar-striped">
    <div style="width: 0%;">
        <p>0%</p>
    </div>
</div>

<table id="data" class="table display table-stripped">
    <thead>
        <tr>
            <th>ID</th>
            <th>Album ID</th>
            <th>Title</th>
            <th>URL Photo</th>
        </tr>
    </thead>
    <tbody></tbody>
</table>

表格已成功加载，但进度条显示

100%
而不是应该从
0%
递增到
100%
。我想知道它是否有效（但不完美）如果我不使用数据表，如下面的代码所示。

let handleProgressBar = (id, value, total) => {
    let percent = Math.round((value / total) * 10000) / 100;
    $(id + " > div").html(percent + "%");
    $(id + " > div").css('width', percent + "%");
}

(async() =>{
  let n = 5000;
  handleProgressBar('#progress-bar', 0, n);
  for(let i = 1; i <= n; i++) {
    handleProgressBar('#progress-bar', i, n);
    await new Promise(r => setTimeout(r, 1)); // sleep 1 ms
  }
})();
.progress-bar-striped {
    overflow: hidden;
    height: 20px;
    margin-bottom: 20px;
    background-color: #f5f5f5;
    border-radius: 4px;
    -webkit-box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
    -moz-box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
}

.progress-bar-striped>div {
    background-image: linear-gradient(45deg, rgba(255, 255, 255, 0.15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, transparent 75%, transparent);
    background-size: 40px 40px;
    float: left;
    width: 0%;
    height: 100%;
    font-size: 12px;
    line-height: 20px;
    color: #000000;
    font-weight: bold;
    text-align: center;
    -webkit-box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.15);
    -moz-box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.15);
    box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.15);
    /*-webkit-transition: width 3s ease;
    -moz-transition: width 3s ease;
    -o-transition: width 3s ease;
    transition: width 3s ease;*/
    animation: progress-bar-stripes 2s linear infinite;
    background-color: #288ade;
}

.progress-bar-striped p {
    margin: 0;
}

@keyframes progress-bar-stripes {
    0% {
        background-position: 40px 0;
    }
    100% {
        background-position: 0 0;
    }
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="progress-bar" class="progress-bar-striped">
    <div style="width: 0%;">
        <p>0%</p>
    </div>
</div>

我不知道错误在哪里。任何人都可以为我提供处理大量数据的数据表进度条的完美方法吗？谢谢。

javascript jquery css datatables progress-bar
1个回答
0
投票

我找到了解决方案。错误是我把

async
这个词放在了
res.forEach
里面。当我把它放在 
fetch.then
之后并使用 
for
循环而不是 
forEach
时，函数执行的行为发生了变化并且可以成功完成。 
loadNumber
变量可用于确定每单位时间将在数据表中绘制多少数据。

let handleProgressBar = (id, value, total) => {
    let percent = Math.round((value / total) * 10000) / 100;
    $(id + " > div").html(percent + "%");
    $(id + " > div").css('width', percent + "%");
}

let table = $('#data').DataTable({
  dom: 'ilpftr'
});

fetch('https://jsonplaceholder.typicode.com/photos')
.then((res) => res.json())
.then(async(res) => {
  let loadNumber = 50;
  for(let i = 0; i < res.length; i++) {
    table.row.add([
      res[i].id,
      res[i].albumId,
      res[i].title,
      res[i].url
    ]);
    if (i % loadNumber == 0) {
      table.draw();
      handleProgressBar('#progress-bar', i+1, res.length);
      await new Promise(r => setTimeout(r, 1)); // sleep 1 ms
    }
  }
  table.draw();
  handleProgressBar('#progress-bar', res.length, res.length);
});
.progress-bar-striped {
    overflow: hidden;
    height: 20px;
    margin-bottom: 20px;
    background-color: #f5f5f5;
    border-radius: 4px;
    -webkit-box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
    -moz-box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
}

.progress-bar-striped>div {
    background-image: linear-gradient(45deg, rgba(255, 255, 255, 0.15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, transparent 75%, transparent);
    background-size: 40px 40px;
    float: left;
    width: 0%;
    height: 100%;
    font-size: 12px;
    line-height: 20px;
    color: #000000;
    font-weight: bold;
    text-align: center;
    -webkit-box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.15);
    -moz-box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.15);
    box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.15);
    /*-webkit-transition: width 3s ease;
    -moz-transition: width 3s ease;
    -o-transition: width 3s ease;
    transition: width 3s ease;*/
    animation: progress-bar-stripes 2s linear infinite;
    background-color: #288ade;
}

.progress-bar-striped p {
    margin: 0;
}

@keyframes progress-bar-stripes {
    0% {
        background-position: 40px 0;
    }
    100% {
        background-position: 0 0;
    }
}
<link href="https://cdn.datatables.net/1.13.4/css/jquery.dataTables.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdn.datatables.net/1.13.4/js/jquery.dataTables.min.js"></script>

<div id="progress-bar" class="progress-bar-striped">
    <div style="width: 0%;">
        <p>0%</p>
    </div>
</div>

<table id="data" class="table display table-stripped">
    <thead>
        <tr>
            <th>ID</th>
            <th>Album ID</th>
            <th>Title</th>
            <th>URL Photo</th>
        </tr>
    </thead>
    <tbody></tbody>
</table>

注意：如果您有更好的解决方案，请编辑或重新回答

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