如何将输入字段值限制为某个数字

Question

我有一个 HTML 表格，里面有一列 AcceptedQty 是输入字段

我总共有 5 列 Code,Item Name,unitcode,Quantity 和 AcceptedQty 其中两个 Quantity 和 AcceptedQty 具有相同的值，但 AcceptedQty 是输入字段，因此用户可以在其中输入任何数字，我已将 type="number" 设为仅输入数字

我想要做什么

• 当用户在输入字段中输入任何数字时，不应允许他输入更大的数字到相应的数量
• 假设code 1326 Quantity 是3，所以在编辑AcceptedQty 时我想限制用户不要输入任何大于3 的数字
• 这里我有一个 HTML 表格和这么多行，这就是为什么很难做到

片段

var tableDataDraft = [{
    "Code": "1326",
    "Item Name": "PINEAPPLE KG",
    "unitcode": "NOS",
    "Quantity": "3.0000",
    "AcceptedQty": "3.0000"
  },
  {
    "Code": "1494",
    "Item Name": "2D CAKE CHARGES PER KG",
    "unitcode": "NOS",
    "Quantity": "3.0000",
    "AcceptedQty": "3.0000"
  }
]

function addTableDraft(tableDataDraft) {
  var col = Object.keys(tableDataDraft[0]);
  var countNum = col.filter(i => !isNaN(i)).length;
  var num = col.splice(0, countNum);
  col = col.concat(num);
  var table = document.createElement("table");
  var tr = table.insertRow(-1);
  for (var i = 0; i < col.length; i++) {
    var th = document.createElement("th");
    th.innerHTML = col[i];
    tr.appendChild(th);
    tr.classList.add("text-center");
    tr.classList.add("head")
  }
  for (var i = 0; i < tableDataDraft.length; i++) {
    tr = table.insertRow(-1);
    for (var j = 0; j < col.length; j++) {
      let tabCell = tr.insertCell(-1);
      var hiddenField = document.createElement("input"); //creating input field hidden
      hiddenField.style.display = "none";
      var tabledata = tableDataDraft[i][col[j]];
      if (tableDataDraft[i]['Code'] === tableDataDraft[i][col[j]]) { //now setting html attributes
        tabCell.innerHTML = tabledata;
        hiddenField.setAttribute('name', 'Item_Code');
        hiddenField.setAttribute('value', tabledata);
        tabCell.appendChild(hiddenField);
      }
      if (tableDataDraft[i]['Item Name'] === tableDataDraft[i][col[j]]) {
        tabCell.innerHTML = tabledata;
        hiddenField.setAttribute('name', 'Item_Name');
        hiddenField.setAttribute('value', tabledata);
        tabCell.appendChild(hiddenField);
      }
      if (tableDataDraft[i]['unitcode'] === tableDataDraft[i][col[j]]) {
        tabCell.innerHTML = tabledata;
        hiddenField.setAttribute('name', 'Unit_code');
        hiddenField.setAttribute('value', tabledata);
        tabCell.appendChild(hiddenField);
      }
      if (col[j] === 'Quantity') {
        tabCell.innerHTML = tabledata;
        hiddenField.setAttribute('name', 'Quantity');
        tabCell.appendChild(hiddenField);
      }
      if (col[j] === 'AcceptedQty') {
        var quantityField = document.createElement("input");
        quantityField.style.border = "none";
        quantityField.style["text-align"] = "right";
        quantityField.setAttribute("name", "AcceptedQty");
        quantityField.setAttribute("autocomplete", "on");
        quantityField.setAttribute("value", tabledata);
        quantityField.setAttribute("type", "number");
        quantityField.setAttribute("required", "required");
        quantityField.classList.add("dataReset");
        quantityField.toLocaleString('en-IN');
        tabCell.appendChild(quantityField);
      }

      if (j > 1)
        tabCell.classList.add("text-right");
    }
  }
  var divContainer = document.getElementById("table");
  divContainer.innerHTML = "";
  divContainer.appendChild(table);
  table.classList.add("table");
  table.classList.add("table-striped");
  table.classList.add("table-bordered");
  table.classList.add("table-hover");
}
addTableDraft(tableDataDraft)

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/css/bootstrap.min.css">

<div class="table-responsive" id="commonDvScroll">
  <table id=table></table>
</div>

Answer 1

我已经让 type="tel" 只输入数字

使用type="number"（"tel" 是一个电话号码）和HTMLInputElement（和step，如果你不想要小数值）。可能还包括一个 input 处理程序来处理没有 HTML5 字段功能的浏览器。

查看*** 注释行：

var tableDataDraft = [{
    "Code": "1326",
    "Item Name": "PINEAPPLE KG",
    "unitcode": "NOS",
    "Quantity": "3.0000",
    "AcceptedQty": "3.0000"
  },
  {
    "Code": "1494",
    "Item Name": "2D CAKE CHARGES PER KG",
    "unitcode": "NOS",
    "Quantity": "3.0000",
    "AcceptedQty": "3.0000"
  }
]

function addTableDraft(tableDataDraft) {
  var col = Object.keys(tableDataDraft[0]);
  var countNum = col.filter(i => !isNaN(i)).length;
  var num = col.splice(0, countNum);
  col = col.concat(num);
  var table = document.createElement("table");
  var tr = table.insertRow(-1);
  for (var i = 0; i < col.length; i++) {
    var th = document.createElement("th");
    th.innerHTML = col[i];
    tr.appendChild(th);
    tr.classList.add("text-center");
    tr.classList.add("head")
  }
  for (var i = 0; i < tableDataDraft.length; i++) {
    tr = table.insertRow(-1);
    for (var j = 0; j < col.length; j++) {
      let tabCell = tr.insertCell(-1);
      var hiddenField = document.createElement("input"); //creating input field hidden
      hiddenField.style.display = "none";
      var tablerow = tableDataDraft[i]; // ***
      var tabledata = tablerow[col[j]]; // ***
      if (tableDataDraft[i]['Code'] === tableDataDraft[i][col[j]]) { //now setting html attributes
        tabCell.innerHTML = tabledata;
        hiddenField.setAttribute('name', 'Item_Code');
        hiddenField.setAttribute('value', tabledata);
        tabCell.appendChild(hiddenField);
      }
      if (tableDataDraft[i]['Item Name'] === tableDataDraft[i][col[j]]) {
        tabCell.innerHTML = tabledata;
        hiddenField.setAttribute('name', 'Item_Name');
        hiddenField.setAttribute('value', tabledata);
        tabCell.appendChild(hiddenField);
      }
      if (tableDataDraft[i]['unitcode'] === tableDataDraft[i][col[j]]) {
        tabCell.innerHTML = tabledata;
        hiddenField.setAttribute('name', 'Unit_code');
        hiddenField.setAttribute('value', tabledata);
        tabCell.appendChild(hiddenField);
      }
      if (col[j] === 'Quantity') {
        tabCell.innerHTML = tabledata;
        hiddenField.setAttribute('name', 'Quantity');
        tabCell.appendChild(hiddenField);
      }
      if (col[j] === 'AcceptedQty') {
        var quantityField = document.createElement("input");
        quantityField.style.border = "none";
        quantityField.style["text-align"] = "right";
        quantityField.setAttribute("name", "AcceptedQty");
        quantityField.setAttribute("autocomplete", "on");
        quantityField.setAttribute("value", tabledata);
        quantityField.setAttribute("type", "number");
        quantityField.min = 0;                 // ***
        quantityField.max = tablerow.Quantity; // ***
        quantityField.setAttribute("required", "required");
        quantityField.classList.add("dataReset");
        quantityField.toLocaleString('en-IN');
        tabCell.appendChild(quantityField);
      }

      if (j > 1)
        tabCell.classList.add("text-right");
    }
  }
  var divContainer = document.getElementById("table");
  divContainer.innerHTML = "";
  divContainer.appendChild(table);
  table.classList.add("table");
  table.classList.add("table-striped");
  table.classList.add("table-bordered");
  table.classList.add("table-hover");
}
addTableDraft(tableDataDraft)

input:invalid {
  color: #d00;
  border: 1px solid #d00 !important;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/css/bootstrap.min.css">

<div class="table-responsive" id="commonDvScroll">
  <table id=table></table>
</div>

请注意，用户仍然可以输入更大的数字，但表单不会验证。请参阅 MDN 上的 this tutorial。

Answer 2

正如@T.J Crowder 提到的，使用输入类型number

该输入类型允许您设置 max 值，该值基于先前列的值

此外，您需要向输入添加一个事件侦听器以“侦听”/检测对输入的更改，以便您可以对任何更改采取行动，根据您认为合适的方式限制输入值

---

var tableDataDraft = [{
    "Code": "1326",
    "Item Name": "PINEAPPLE KG",
    "unitcode": "NOS",
    "Quantity": "3.0000",
    "AcceptedQty": "3.0000"
  },
  {
    "Code": "1494",
    "Item Name": "2D CAKE CHARGES PER KG",
    "unitcode": "NOS",
    "Quantity": "3.0000",
    "AcceptedQty": "3.0000"
  }
]

function addTableDraft(tableDataDraft) {
  var col = Object.keys(tableDataDraft[0]);
  var countNum = col.filter(i => !isNaN(i)).length;
  var num = col.splice(0, countNum);
  col = col.concat(num);
  var table = document.createElement("table");
  var tr = table.insertRow(-1);
  for (var i = 0; i < col.length; i++) {
    var th = document.createElement("th");
    th.innerHTML = col[i];
    tr.appendChild(th);
    tr.classList.add("text-center");
    tr.classList.add("head")
  }
  for (var i = 0; i < tableDataDraft.length; i++) {
    tr = table.insertRow(-1);
    for (var j = 0; j < col.length; j++) {
      let tabCell = tr.insertCell(-1);
      var hiddenField = document.createElement("input"); //creating input field hidden
      hiddenField.style.display = "none";
      var tabledata = tableDataDraft[i][col[j]];
      if (tableDataDraft[i]['Code'] === tableDataDraft[i][col[j]]) { //now setting html attributes
        tabCell.innerHTML = tabledata;
        hiddenField.setAttribute('name', 'Item_Code');
        hiddenField.setAttribute('value', tabledata);
        tabCell.appendChild(hiddenField);
      }
      if (tableDataDraft[i]['Item Name'] === tableDataDraft[i][col[j]]) {
        tabCell.innerHTML = tabledata;
        hiddenField.setAttribute('name', 'Item_Name');
        hiddenField.setAttribute('value', tabledata);
        tabCell.appendChild(hiddenField);
      }
      if (tableDataDraft[i]['unitcode'] === tableDataDraft[i][col[j]]) {
        tabCell.innerHTML = tabledata;
        hiddenField.setAttribute('name', 'Unit_code');
        hiddenField.setAttribute('value', tabledata);
        tabCell.appendChild(hiddenField);
      }
      if (col[j] === 'Quantity') {
        tabCell.innerHTML = tabledata;
        hiddenField.setAttribute('name', 'Quantity');
        tabCell.appendChild(hiddenField);
      }
      if (col[j] === 'AcceptedQty') {
        var quantityField = document.createElement("input");
        quantityField.style.border = "none";
        quantityField.style["text-align"] = "right";
        quantityField.setAttribute("name", "AcceptedQty");
        quantityField.setAttribute("autocomplete", "on");
        quantityField.setAttribute("value", tabledata);
        quantityField.setAttribute("type", "number");
        quantityField.setAttribute("required", "required");
        quantityField.setAttribute("max", parseInt(tableDataDraft[i]["Quantity"]));
        quantityField.setAttribute("min", 0);
        quantityField.setAttribute("step", 0.1);


        quantityField.addEventListener("change", function() {
          let max = parseFloat(this.getAttribute('max'));
          let min = parseFloat(this.getAttribute('min'));
          let val = parseFloat(this.value)
          val = val > max ? max : val;
          val = val < min ? min : val;
          if (val != this.value) {
            alert("Input is incorrect");
            this.focus();
          }
          this.value = val;

        });
        quantityField.setAttribute("min", 0);

        quantityField.classList.add("dataReset");
        quantityField.toLocaleString('en-IN');
        tabCell.appendChild(quantityField);
      }

      if (j > 1)
        tabCell.classList.add("text-right");
    }
  }
  var divContainer = document.getElementById("table");
  divContainer.innerHTML = "";
  divContainer.appendChild(table);
  table.classList.add("table");
  table.classList.add("table-striped");
  table.classList.add("table-bordered");
  table.classList.add("table-hover");
}
addTableDraft(tableDataDraft)

input:invalid {
  outline: 1px solid red;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.2/css/bootstrap.min.css">

<div class="table-responsive" id="commonDvScroll">
  <table id=table></table>
</div>