javascript - jquery 使用字符计数器插件进行验证

Question

我有一个页面，其中包含使用 jquery-validate 插件验证的字段，并且希望在字段上包含一个类似 twitter 的字符计数器，以查看还剩下多少个字符

这是我的演示 http://jsfiddle.net/4k1vokgv/1/

$(document).ready(function() {
    $(".counter").characterCounter({
    counterCssClass: 'text-counter',
    limit: 1000,
    counterFormat: 'Characters Remaining: %1',
    });

    var validatorStrat = $("#strategyForm").validate({
      rules:{
        exampleInputEmail1: {
          required: true,
          },
        ZB_note: {
          required: true,
          maxlength: 140,
        },
        ZC_note: {
          required: true,
          maxlength: 140,
        },

      },
      submitHandler: function(form) {}
    });
});

两个字符计数器都可以正常工作，直到 问题是，当 jquery-validate 引发验证错误(必需、最大长度等)时，字符计数器将停止处理任何有错误的元素。

我不认为这是字符计数器插件本身的问题。我认为 jquery validate 的错误生成以某种方式导致了这种情况。

无论如何，包括下面的完整片段，非常感谢任何帮助

/**
* Character Counter v1.0
* ======================
*
* Character Counter is a simple, Twitter style character counter.
*
* https://github.com/dtisgodsson/jquery-character-counter
*
* @author Darren Taylor
* @author Email: <a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="582b30372d2c183c392a2a3d3637362c303d76363d2c" rel="noreferrer noopener nofollow">[email protected]</a>
* @author Twitter: darrentaytay
* @author Website: http://darrenonthe.net
*
*/
(function($) {

    $.fn.characterCounter = function(options){

        var defaults = {
            exceeded: false,
            limit: 150,
            counterWrapper: 'span',
            counterCssClass: 'help-block',
            counterFormat: '%1',
            counterExceededCssClass: 'exceeded',
            onExceed: function(count) {},
            onDeceed: function(count) {},
            customFields: {},
        };

        var options = $.extend(defaults, options);

        return this.each(function() {
            $(this).after(generateCounter());
            bindEvents(this);
            checkCount(this);
        });

        function customFields(params)
        {
            var html='';

            for (var i in params)
            {
                html += ' ' + i + '="' + params[i] + '"';
            }

            return html;
        }

        function generateCounter()
        {
            var classString = options.counterCssClass;

            if(options.customFields.class)
            {
                classString += " " + options.customFields.class;
                delete options.customFields['class'];
            }

            return '<'+ options.counterWrapper +customFields(options.customFields)+' class="' + classString + '"></'+ options.counterWrapper +'>';
        }

        function renderText(count)
        {
            return options.counterFormat.replace(/%1/, count);
        }

        function checkCount(element)
        {
            var characterCount  = $(element).val().length;
            var remaining        = options.limit - characterCount;

            if( remaining < 0 )
            {
                $(element).next("." + options.counterCssClass).addClass(options.counterExceededCssClass);
                options.exceeded = true;
                options.onExceed(characterCount);
            }
            else
            {
                if(options.exceeded) {
                    $(element).next("." + options.counterCssClass).removeClass(options.counterExceededCssClass);
                    options.onDeceed(characterCount);
                    options.exceeded = false;
                }
            }

            $(element).next("." + options.counterCssClass).html(renderText(remaining));
        };    

        function bindEvents(element)
        {
            $(element)
                .bind("keyup", function () {
                    checkCount(element);
                })
                .bind("paste", function () {
                    var self = this;
                    setTimeout(function () { checkCount(self); }, 0);
                });
        }
    };

})(jQuery);

$.validator.setDefaults({
    errorElement: "span",
    errorClass: "help-block",
//	validClass: 'stay',
    highlight: function (element, errorClass, validClass) {
    $(element).addClass(errorClass); //.removeClass(errorClass);
        $(element).closest('.form-group').removeClass('has-success').addClass('has-error');
    },
    unhighlight: function (element, errorClass, validClass) {
    $(element).removeClass(errorClass); //.addClass(validClass);
        $(element).closest('.form-group').removeClass('has-error').addClass('has-success');
    },

    errorPlacement: function(error, element) {
        if(element.parent('.input-group').length) {
           error.insertAfter(element.parent());
         } else if (element.hasClass('select2')) {
           error.insertAfter(element.next('span'));
        } else {
            error.insertAfter(element);
        }

    }
});

$(document).ready(function() {
    $(".counter").characterCounter({
    counterCssClass: 'text-counter',
    limit: 140,
    counterFormat: 'Characters Remaining: %1',
    });
  
    var validatorStrat = $("#strategyForm").validate({
      rules:{
        exampleInputEmail1: {
          required: true,
          },
        ZB_note: {
          required: true,
          maxlength: 1000,
        },
        ZC_note: {
          required: true,
          maxlength: 1000,
        },

      },
      submitHandler: function(form) {}
    });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet"/>
<script src="http://cdn.jsdelivr.net/jquery.validation/1.14.0/jquery.validate.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap-theme.min.css" rel="stylesheet"/>
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css" rel="stylesheet"/>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>

<form role="form" id="strategyForm">
 <div class="form-group">
   <label for="exampleInputEmail1" class="control-label">Email address</label>
     <input type="email" class="form-control" name="exampleInputEmail1" placeholder="Enter email" />
 </div>
 <div class="form-group">
            <label class="control-label">What amount is to be solicited and when?</label>
            <textarea class="form-control counter" rows="1" id="ZB_note" name="ZB_note" ></textarea>
          </div>


          <div class="form-group">
            <label class="control-label">Who will be involved in the soliciation?</label>
            <textarea class="form-control counter" rows="1" id="ZC_note" name="ZC_note" ></textarea>
          </div>
 <button type="submit" class="btn btn-default">Submit</button>
</form>

Answer 1

我在这里制作了一支具有此功能的代码笔。

Codepen

我也会在这里添加和讨论代码，这确实不难。

$( document ).ready(function() {
  $('#text').on('keypress', function(e) {
  var count = $(this).val().length;
   if(count != 0) {
     count += 1;
   } else {
     count = count;
   }
  $('#characterCount').text(count);   
})  
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<div class="row">
  <div class="col m-2">
    <textarea id="text" rows="4" cols="50"></textarea>
  </div>
  <div class="col m-2">
    <textarea id="characterCount" rows="4" cols="50"></textarea>
  </div>
</div>

document.ready 函数确保该函数在 DOM 准备就绪时加载。然后，只要在文本区域上按下某个键，就会触发一个函数。然后，您可以将计数变量设置为当前文本 ID 值的长度。然后将计数设置为加一，因为它是零索引。然后，您可以在另一个文本区域上表示该值。