Real-time statistics update code of JS input box word count

In front-end development, input content needs to be verified in many cases. The real-time statistics function, for fixed-length input, allows users to clarify input boundaries in real time and arrange content reasonably.

This article mainly introduces the function of real-time statistical update of word count in the input box

Real-time statistical update of word count

The following will take [Message Content] as an example to design and implement the real-time statistical update function of the number of words in the input box.
The project structure is as follows:

message

message.css
message.js
message.tpl

1. Define web page elements in message.tpl file

//移动端微信公众号开发
<p class="weui-cellbd">
  <textarea id="content" class="weui-textarea" placeholder="新消息内容"
                   rows="3">
  </textarea>
  <p class="weui-textarea-counter">
    <span class="contentcount">0</span>/200
  </p>
</p>
//web端业务开发
<p class="modal-body" style="box-sizing: border-box;">
  <form id="newtaskform" class="form-horizontal"></form>
</p>

2. Bind events in message.js file , used to count Input characters

//移动端 tooltips提示形式
$('#content').bind('input propertychange', function () {
  var fizeNum = $(this).val().length;
  if (fizeNum > 200) {
    var char = $(this).val();
    char = char.substr(0, 200);
    $(this).val(char);
    fizeNum = 200;
    tooltipsShow('消息内容不能超过200字');
  }
  $(this).parent().find('.contentcount').text(fizeNum);
});
//web网页span提示形式
FileName = &#39;<p class="form-group" id="text"><label class="col-sm-3 control-label" id="textlabel"><span class="dot"></span>消息内容</label>&#39;+ 
&#39;<p class="col-sm-9 input-container "><textarea id="msgcontent" name="text" rows="8" style="width:100%;padding-right:20px"></textarea>&#39; +
&#39;<p class="counter" style="float:right;">&#39; +
&#39;<span id="texttips" style="display: none; color: #ff0000;">消息内容超出最大限制</span><span class="contentcount">0</span>/200</p>&#39; +
&#39;</p></p>&#39;;
$("#newtaskform").append(FileName);
$(&#39;#msgcontent&#39;).bind(&#39;input propertychange&#39;, function () {
  var fizeNum = $(this).val().length;
  if (fizeNum > 200) {
    var char = $(this).val();
    char = char.substr(0, 200);
    $(this).val(char);
    fizeNum = 200;
    $("#texttips").show();
  }else{
    $("#texttips").hide();
  }
  $(this).parent().find(&#39;.contentcount&#39;).text(fizeNum);
});

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