不需要阻止用户按Enter键(这似乎不自然)，您可以让表单保持原样，并添加一些额外的客户端验证:当调查未完成时，结果不会发送到服务器，用户会收到一条漂亮的消息，告诉需要完成哪些内容才能完成表单。如果您正在使用jQuery，请尝试验证插件:

http://docs.jquery.com/Plugins/Validation

这将需要比捕捉Enter按钮更多的工作，但肯定会提供更丰富的用户体验。

为了阻止表单被提交，我必须捕获所有与按下键相关的三个事件:

    var preventSubmit = function(event) {
        if(event.keyCode == 13) {
            console.log("caught ya!");
            event.preventDefault();
            //event.stopPropagation();
            return false;
        }
    }
    $("#search").keypress(preventSubmit);
    $("#search").keydown(preventSubmit);
    $("#search").keyup(preventSubmit);

你可以把上面所有的组合成一个漂亮的紧凑版本:

    $('#search').bind('keypress keydown keyup', function(e){
       if(e.keyCode == 13) { e.preventDefault(); }
    });

在我的情况下，我有一对jQuery UI自动完成字段和文本区域的形式，所以我肯定希望他们接受进入。所以我从表单中删除了type="submit"输入，并添加了一个锚<a href="" id="btn">Ok</a>。然后我把它设置为一个按钮，并添加以下代码:

$( '#btn' ).click( function( event ){
    event.preventDefault();
    if ( validateData() ){
        $( 'form#frm' ).append( '<input type="submit" id="frm-submit" style="display:none;"></input>' );
        setTimeout( function(){ $( '#frm-submit' ).click(); }, 500 );
    }
    return false;
});

如果用户填写了所有必需的字段，validateData()将成功并提交表单。

一种完全不同的方法:

The first <button type="submit"> in the form will be activated on pressing Enter. This is true even if the button is hidden with style="display:none; The script for that button can return false, which aborts the submission process. You can still have another <button type=submit> to submit the form. Just return true to cascade the submission. Pressing Enter while the real submit button is focussed will activate the real submit button. Pressing Enter inside <textarea> or other form controls will behave as normal. Pressing Enter inside <input> form controls will trigger the first <button type=submit>, which returns false, and thus nothing happens.

因此:

<form action="...">
  <!-- insert this next line immediately after the <form> opening tag -->
  <button type=submit onclick="return false;" style="display:none;"></button>

  <!-- everything else follows as normal -->
  <!-- ... -->
  <button type=submit>Submit</button>
</form>

您可以使用一种方法，例如

$(document).ready(function() {
  $(window).keydown(function(event){
    if(event.keyCode == 13) {
      event.preventDefault();
      return false;
    }
  });
});

在阅读原文的评论时，为了让它更有用，并允许人们在填写完所有字段后按Enter:

function validationFunction() {
  $('input').each(function() {
    ...

  }
  if(good) {
    return true;
  }
  return false;
}

$(document).ready(function() {
  $(window).keydown(function(event){
    if( (event.keyCode == 13) && (validationFunction() == false) ) {
      event.preventDefault();
      return false;
    }
  });
});

第4.10.22.2节隐式提交的W3C HTML5规范说:

A form element's default button is the first submit button in tree order whose form owner is that form element. If the user agent supports letting the user submit a form implicitly (for example, on some platforms hitting the "enter" key while a text field is focused implicitly submits the form), then doing so for a form whose default button has a defined activation behavior must cause the user agent to run synthetic click activation steps on that default button. Note: Consequently, if the default button is disabled, the form is not submitted when such an implicit submission mechanism is used. (A button has no activation behavior when disabled.)

因此，一种符合标准的禁用表单隐式提交的方法是将禁用的提交按钮作为表单中的第一个提交按钮:

<form action="...">
  <!-- Prevent implicit submission of the form -->
  <button type="submit" disabled style="display: none" aria-hidden="true"></button>

  <!-- ... -->

  <button type="submit">Submit</button>
</form>

这种方法的一个很好的特性是它不需要JavaScript;无论是否启用JavaScript，都需要一个符合标准的web浏览器来防止隐式表单提交。