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如何使用jQuery检测按键盘输入？

程序员文章站 2022-05-27 10:33:46
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本文翻译自：How to detect pressing Enter on keyboard using jQuery?

I would like to detect whether the user has pressed Enter using jQuery. 我想检测用户是否使用jQuery按Enter键 。

How is this possible? 这怎么可能？ Does it require a plugin? 它需要插件吗？

EDIT: It looks like I need to use the keypress() method. 编辑：看起来我需要使用keypress()方法。

I wanted to know if anyone knows if there are browser issues with that command - like are there any browser compatibility issues I should know about? 我想知道是否有人知道该命令是否存在浏览器问题 - 比如我是否应该了解任何浏览器兼容性问题？

#1楼

参考：https://stackoom.com/question/46r0/如何使用jQuery检测按键盘输入

#2楼

The easy way to detect whether the user has pressed enter is to use key number the enter key number is =13 to check the value of key in your device 检测用户是否按下输入的简单方法是使用**编号输入**编号= 13来检查设备中**的值 

$("input").keypress(function (e) {
  if (e.which == 32 || (65 <= e.which && e.which <= 65 + 25)
                    || (97 <= e.which && e.which <= 97 + 25)) {
    var c = String.fromCharCode(e.which);
    $("p").append($("<span/>"))
          .children(":last")
          .append(document.createTextNode(c));
  } else if (e.which == 8) {
    // backspace in IE only be on keydown
    $("p").children(":last").remove();
  }
  $("div").text(e.which);
});

by pressing the enter key you will get result as 13 . 按回车键，结果为13。 using the key value you can call a function or do whatever you wish 使用键值可以调用函数或执行任何操作 

        $(document).keypress(function(e) {
      if(e.which == 13) {
console.log("User entered Enter key");
          // the code you want to run 
      }
    });

if you want to target a button once enter key is pressed you can use the code 如果您想在按下回车键后按下按钮，则可以使用该代码 

    $(document).bind('keypress', function(e){
  if(e.which === 13) { // return
     $('#butonname').trigger('click');
  }
});

Hope it help 希望它有所帮助

#3楼

You can do this using the jquery 'keydown' event handle 您可以使用jquery'keydown'事件句柄来完成此操作 

   $( "#start" ).on( "keydown", function(event) {
      if(event.which == 13) 
         alert("Entered!");
    });

#4楼

In some cases, you may need to suppress the ENTER key for a certain area of a page but not for other areas of a page, like the page below that contains a header <div> with a SEARCH field. 在某些情况下，您可能需要禁止页面的某个区域的ENTER键，而不是页面的其他区域，如下面的页面包含带有SEARCH字段的标题 <div> 。

It took me a bit to figure out how to do this, and I am posting this simple yet complete example up here for the community. 我花了一些时间来弄清楚如何做到这一点，我在这里为社区发布这个简单而完整的例子。 

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
  <title>Test Script</title>
  <script src="/lib/js/jquery-1.7.1.min.js" type="text/javascript"></script>
  <script type="text/javascript">
    $('.container .content input').keypress(function (event) {
      if (event.keyCode == 10 || event.keyCode == 13) {
        alert('Form Submission needs to occur using the Submit button.');
        event.preventDefault();
      }
    });
  </script>
</head>
  <body>
    <div class="container">
      <div class="header">
        <div class="FileSearch">
          <!-- Other HTML here -->
        </div>
      </div>
      <div class="content">
        <form id="testInput" action="#" method="post">
        <input type="text" name="text1" />
        <input type="text" name="text2" />
        <input type="text" name="text3" />
        <input type="submit" name="Submit" value="Submit" />
        </form>
      </div>
    </div>
  </body>
</html>

Link to JSFiddle Playground : The [Submit] button does not do anything, but pressing ENTER from one of the Text Box controls will not submit the form. 链接到JSFiddle Playground ： [Submit]按钮不执行任何操作，但是从其中一个Text Box控件按Enter键将不会提交表单。

#5楼

I spent sometime coming up with this solution i hope it helps someone. 我花了一些时间来提出这个解决方案，我希望它可以帮助某人。 

$(document).ready(function(){

  $('#loginforms').keypress(function(e) {
    if (e.which == 13) {
    //e.preventDefault();
    alert('login pressed');
    }
  });

 $('#signupforms').keypress(function(e) {
    if (e.which == 13) {
      //e.preventDefault();
      alert('register');
    }
  });

});

#6楼

A minor extension of Andrea's answer above makes the helper method more useful when you may also want to capture modified enter presses (ie ctrl-enter or shift-enter). Andrea上面的答案的一个小扩展使得辅助方法更有用，当您可能还想捕获修改后的输入按下（即ctrl-enter或shift-enter）。 For example, this variant allows binding like: 例如，此变体允许绑定，如： 

$('textarea').enterKey(function() {$(this).closest('form').submit(); }, 'ctrl')

to submit a form when the user presses ctrl-enter with focus on that form's textarea. 当用户按下ctrl-enter时，提交一个表单，焦点在该表单的textarea上。 

$.fn.enterKey = function (fnc, mod) {
    return this.each(function () {
        $(this).keypress(function (ev) {
            var keycode = (ev.keyCode ? ev.keyCode : ev.which);
            if ((keycode == '13' || keycode == '10') && (!mod || ev[mod + 'Key'])) {
                fnc.call(this, ev);
            }
        })
    })
}

(see also Ctrl+Enter jQuery in TEXTAREA ) （另请参阅Ctrl +在TEXTAREA中输入jQuery ）

相关标签： javascript jquery keyboard-events enter jquery-events

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