Question

我正在研究Javascript验证代码，以检查注释中的空白字段，每个注释文本区域至少50个字符。我从输入的文本中扣除50来显示错误弹出消息中剩余的字符。但是，当我打开表单时，我没有输入任何内容，单击“提交”按钮，仅问题2弹出错误消息，如“ Q＃2-需要50个字符。剩余50个字符。问题1应该显示相同的错误消息但是没有。

你能帮我吗？

代码如下：

function check() {
  var errorMessage = '';

  var Q1textLength = document.getElementById('textarea1').value.length;
  var Q1text = 50 - Q1textLength
  if (Q1textLength < 50)
    errorMessage += "Q#1 - 50 character required.  " + Q1text + " characters remaining. \n";

  var Q2textLength = document.getElementById('textarea2').value.length;
  var Q2text = 50 - Q2textLength
  if (Q2textLength < 50)
    errorMessage = "Q#2 - 50 character required.  " + Q2text + " characters remaining. \n";
  if (errorMessage) {
    alert(errorMessage);
    return false;
  }
  return true;
}

<form action="action.asp" name="frm1" method="Post" />
<fieldset>
  <legend>Question 1</legend>
  <label for="Comment1">Comments:</label>
  <textarea rows="3" cols="85" name="Q1C" id="textarea1" placeholder="Write at least 50 characters" required /></textarea>
</fieldset>

<fieldset>
  <legend>Question 2</legend>
  <label for="Comment2">Comments:</label>
  <textarea rows="3" cols="85" name="Q2C" id="textarea2" placeholder="Write at least 50 characters" required /></textarea>
</fieldset>

<p class="submit"><input type="submit" onClick="return check()" value="Submit"></p>
</form>

Answer 1

那是因为您要在第二个问题中使用相等的errorMessage来覆盖变量=，所以应该改用+=。

注意：：/中有一个斜杠textarea，应将其删除：

<textarea .... placeholder="Write at least 50 characters" required /></textarea>
___________________________________________________________________^

function check() {
  var errorMessage = '';

  var Q1textLength = document.getElementById('textarea1').value.length;
  var Q1text = 50 - Q1textLength
  if (Q1textLength < 50)
    errorMessage += "Q#1 - 50 character required.  " + Q1text + " characters remaining. \n";

  var Q2textLength = document.getElementById('textarea2').value.length;
  var Q2text = 50 - Q2textLength
  if (Q2textLength < 50)
    errorMessage += "Q#2 - 50 character required.  " + Q2text + " characters remaining. \n";
  if (errorMessage) {
    alert(errorMessage);
    return false;
  }
  return true;
}

<form action="action.asp" name="frm1" method="Post" />
<fieldset>
  <legend>Question 1</legend>
  <label for="Comment1">Comments:</label>
  <textarea rows="3" cols="85" name="Q1C" id="textarea1" placeholder="Write at least 50 characters" required></textarea>
</fieldset>

<fieldset>
  <legend>Question 2</legend>
  <label for="Comment2">Comments:</label>
  <textarea rows="3" cols="85" name="Q2C" id="textarea2" placeholder="Write at least 50 characters" required></textarea>
</fieldset>

<p class="submit"><input type="submit" onClick="return check()" value="Submit"></p>
</form>

Answer 2

更改此

errorMessage = errorMessage+ "Q#2 - 50 character required.  " + Q2text + " characters remaining. \n";
if(errorMessage)

JavaScript验证表单检查文本区域长度

2 个答案: