textarea 控制输入字符字节数(示例代码)

215 阅读 0 评论 142 点赞

我是靠谱客的博主愉快宝马，这篇文章主要介绍textarea 控制输入字符字节数(示例代码)，现在分享给大家，希望可以做个参考。

按字符数控制：

复制代码代码如下:

<textarea name="gbContent"  style="width: 500px; height: 200px;"
             onkeyup="if(this.value.length>2000) this.value=this.value.substr(0,2000)"
             onkeydown="if(this.value.length>2000) this.value=this.value.substr(0,2000)"
             onblur="if(this.value.length>2000) this.value=this.value.substr(0,2000)"
             onpropertychange= "if(this.value.length>2000) this.value=this.value.substr(0,2000)"></textarea>

按字节数控制：

复制代码代码如下:

<textarea cols="50" id="description" name="userModel.description" rows="5"
      onkeydown="key1=this.value;value1 = key1.replace(/[u4e00-u9fa5]/g,' ');if(value1.length>500) this.value=this.value.substr(0,500)" 
      onkeyup="key1=this.value;value1 = key1.replace(/[u4e00-u9fa5]/g,' ');if(value1.length>500) this.value=this.value.substr(0,500)"
      onblur="key1=this.value;value1 = key1.replace(/[u4e00-u9fa5]/g,' ');if(value1.length>500) this.value=this.value.substr(0,500)"  
      onchange="key1=this.value;value1 = key1.replace(/[u4e00-u9fa5]/g,' ');if(value1.length>500) this.value=this.value.substr(0,500)"></textarea>