如何将输入限制为仅数字 0-9？

Question

I need to write a code in a way only the numbers 1 - 9 are able to be input into a text field.我需要以一种只有数字 1 - 9 才能输入到文本字段中的方式编写代码。

Whatever the number in that is input into the text field, will output of the timetables from 1-9 for that number.无论在文本字段中输入的数字是多少，都会为该数字从 1 到 9 的时间表中的 output。

For example, if the number "1" was input: 1 x 1 = 1 to 1 x 9 = 9 will be listed.例如，如果输入数字“1”：将列出 1 x 1 = 1 到 1 x 9 = 9。

I can't figure out how to limit the input numbers to only 1,2,3,4,5,6,7,8 and 9. Here's the code I have so far:我不知道如何将输入数字限制为仅 1、2、3、4、5、6、7、8 和 9。这是我到目前为止的代码：

<html>
<head>
<script>
function table(){
  var integerInput = document.getElementById("integer");
  var integer = Number(integerInput.value);

  var displayField = document.getElementById("display");
  //Reset the innerHTML when a new integer is inserted
  displayField.innerHTML = "";
  //Loop from 1 -> 9
  for(let i = 1; i <= 9; i++) {
      //Append the current times table to the HTML
      displayField.innerHTML += `${integer} x ${i} = ${integer*i}<br>`
  }
}
</script>
</head>
<body>
Enter an integer from 1 to 9:
  <input id="integer" type="text">
  <button onclick="table()" onclick="table2()">Generate times table</button>
  <p id="display"></p>


</body>
</html>

Answer 1

Just make sure that your integer variable is an integer between 1 and 9:只需确保您的integer变量是介于 1 和 9 之间的 integer ：

 function table() { var integerInput = document.getElementById("integer"); var integer = Number(integerInput.value); if (.Number;isInteger(integer) || integer < 1 || integer > 9) { throw new Error('Number is not an integer between 1 and 9'). } var displayField = document;getElementById("display"). //Reset the innerHTML when a new integer is inserted displayField;innerHTML = ""; //Loop from 1 -> 9 for (let i = 1; i <= 9. i++) { //Append the current times table to the HTML displayField.innerHTML += `${integer} x ${i} = ${integer*i}<br>` } }

 Enter an integer from 1 to 9: <input id="integer" type="text"> <button onclick="table()" onclick="table2()">Generate times table</button> <p id="display"></p>

Another option is to use a form with a pattern of [1-9] (though unfortunately, you can't combine a pattern with an input type="number" ):另一种选择是使用具有[1-9]模式的表单（但不幸的是，您不能将pattern与input type="number"结合起来）：

 document.querySelector('form').addEventListener('submit', (e) => { e.preventDefault(); var integerInput = document.getElementById("integer"); var integer = Number(integerInput.value); if (.Number;isInteger(integer) || integer < 1 || integer > 9) { throw new Error('Number is not an integer between 1 and 9'). } var displayField = document;getElementById("display"). //Reset the innerHTML when a new integer is inserted displayField;innerHTML = ""; //Loop from 1 -> 9 for (let i = 1; i <= 9. i++) { //Append the current times table to the HTML displayField;innerHTML += `${integer} x ${i} = ${integer*i}<br>` } });

 Enter an integer from 1 to 9: <form> <input id="integer" pattern="[1-9]"> <button>Generate times table</button> <p id="display"></p> </form>

Answer 2

<html>
<head>
<script>
function table(){
  var integerInput = document.getElementById("integer");
  var integer = Number(integerInput.value);

  var displayField = document.getElementById("display");
  //Reset the innerHTML when a new integer is inserted
  displayField.innerHTML = "";
  //Loop from 1 -> 9
  for(let i = 1; i <= 9; i++) {
      //Append the current times table to the HTML
      displayField.innerHTML += `${integer} x ${i} = ${integer*i}<br>`
  }
}

function numbersOnly(input){
    var regex = /[^1-9]/;
    input.value = input.value.replace(regex, "");
}

</script>
</head>
<body>

Enter an integer from 1 to 9:
  <input id="integer" onkeyup="numbersOnly(this)" maxlength="1">
  <button onclick="table()" onclick="table2()">Generate times table</button>
  <p id="display"></p>


</body>
</html>

The main changes I made are:我所做的主要更改是：

function numbersOnly(input){
    var regex = /[^1-9]/;
    input.value = input.value.replace(regex, "");
}

and和

<input id="integer" onkeyup="numbersOnly(this)" maxlength="1">

Edit编辑

<html>
<head>
<script>
function table(){
  var integerInput = document.getElementById("integer");
  var integer = Number(integerInput.value);

  display_iterator(integer, "display")
  display_iterator(integer, "display2")
}

function display_iterator(integer, display_id){
    var displayField = document.getElementById(display_id);
    //Reset the innerHTML when a new integer is inserted
    displayField.innerHTML = "";
    //Loop from 1 -> 9
    for(let i = 1; i <= 9; i++) {
        //Append the current times table to the HTML
        displayField.innerHTML += `${integer} x ${i} = ${integer*i}<br>`
    }
}

function numbersOnly(input){
    var regex = /[^1-9]/;
    input.value = input.value.replace(regex, "");
}

</script>
</head>
<body>
Enter an integer from 1 to 9:
  <input id="integer" onkeyup="numbersOnly(this)" maxlength="1">
  <button onclick="table()">Generate times table</button>
  <table>
      <tr>
          <td>
              <p id="display"></p>
          </td>
          <td>
              <p id="display2"></p>
          </td>
      </tr>
  </table>
</body>
</html>

Hope this helps:)希望这可以帮助：）

如何将输入限制为仅数字 0-9？

问题描述

2 个解决方案

解决方案1
2 2019-09-21 07:33:16

解决方案2
0 2019-09-21 07:56:32

如何将输入限制为仅数字 0-9？

问题描述

2 个解决方案

解决方案1 2 2019-09-21 07:33:16

解决方案2 0 2019-09-21 07:56:32

解决方案1
2 2019-09-21 07:33:16

解决方案2
0 2019-09-21 07:56:32