用户输入错误时刷新页面答案

【问题标题】：Refreshing a page when user input is wrong用户输入错误时刷新页面
【发布时间】：2021-04-13 20:06:41
【问题描述】：

当用户输入错误时如何重新加载/刷新表单，因为我正在动态生成表单，我设法显示警告消息但在重置字段时遇到问题，还建议我的代码需要任何改进？

...

JavaScript: 
    
    const div = document.querySelector(".addHere");
    
    document.querySelector(".btn").addEventListener("click", addInputs);
    
    function addInputs() {
    
    const inputValue = parseInt(document.querySelector(".inputValue").value);
    
      if (isNaN(inputValue)) {
        alert("Wrong input");

          const form = document.createElement("form");
          form.method = "post";
          form.action = "#";

      } else {
        for (let i = 1; i <= inputValue; i++) {
    
          const input1 = document.createElement("input");
          input1.type = "text";
          input1.maxLength = "12";
          input1.className = "factor";
          input1.required = true;
    
          const input2 = document.createElement("input");
          input2.type = "text";
          input2.maxLength = "1";
          input2.className = "priority";
          input2.required = true;
    
          const br = document.createElement("br");
    
          form.appendChild(br.cloneNode());
          form.appendChild(input1);
          form.appendChild(input2);
          form.appendChild(br.cloneNode());
    
          div.appendChild(form);
        }
    
        const sub = document.createElement("button");
        sub.type = "submit";
        sub.value = "Submit";
        sub.className = "subButton";
        sub.textContent = "Submit";
    
        div.appendChild(sub);
      }
    }

HTML：

<div class="addHere"></div>
<div class="inputs">
  <input type="text" maxlength="1" class="inputValue" placeholder="insert numbers:" />
  <button class="btn">+</button>
</div>

【问题讨论】：

标签： javascript forms refresh

【解决方案1】：

您可以像这样将整个表单的输入重置为其原始值：

<script>
    document.getElementById('myform').reset();
</script>

或者只有一个这样的输入元素：

<script>
    document.getElementById('userName').value = '';
</script>

如果你想重新加载整个页面，你应该这样做：

<script>
    document.location.href = document.location.href;
</script>

<form id="myform">

    <input id="userName" type="text" />

</form>

这个怎么样？

CCS：

    <style>
        .subButton {
            display: none;
        }
    </style>

脚本：

    <script>
        window.addEventListener('load', (event) => {
            document.querySelector(".btnAdd").addEventListener("click", addInputs);
        });

        function addInputs() {
            const inputValue = parseInt(document.querySelector(".inputValue").value);
            if (isNaN(inputValue) || inputValue < 1) {
                alert("Wrong input");
                document.querySelector(".inputValue").value = '';
            } else {
                let html = '';
                for (let i = 1; i <= inputValue; i++) {
                    html += '<input type="text" maxlength="12" class="factor" required>';
                    html += '<input type="text" maxlength="1" class="priority" required>';
                    html += '<br />';
                }
                document.querySelector(".addHere").innerHTML = html;
                document.querySelector(".subButton").style.display = 'block';
                document.querySelector(".inputs").style.display = 'none';
            }
        }
    </script>

HTML：

<body>
    <form method="post" action="#">
        <div class="addHere"></div>
        <input type="submit" value="Submit" class="subButton" />
        <div class="inputs">
            <input type="text" maxlength="1" class="inputValue" placeholder="insert numbers:" />
            <button type="button" class="btnAdd">+</button>
        </div>
    </form>
</body>

【讨论】：

【解决方案2】：

试试这一行

document.getElementById('input').value = "";

【讨论】：