WeChat applet component: textarea multi-line input box interpretation and analysis

textarea multi-line input box component description:

textarea multi-line input box.

The textarea multi-line input box sample code runs as follows:

The following is the WXML code:

<view class="content">
placeholder：
<textarea placeholder="占位符" />
<textarea placeholder="占位符 改变样式style" placeholder-style=
"color:blue"/>
<textarea placeholder="占位符 改变样式class" placeholder-class="placeholdText"/>
</view>

The following is the WXSS code:

.content{
  border:1px black solid;
  margin: 10px;
  font-size: 10pt;
  padding: 10px;
}
textarea{
  border: 1px red solid;
  margin: auto;
  width:100%;
  height: 3em;
  margin-top:5px;
  padding: 3px;
}
/*占位符样式*/
.placeholdText{
  font-size: 2em;
}

Textarea multi-line input box event rendering:

The following is the WXML code::

<view class="content">
auto-height：
<textarea  auto-height placeholder="自动增高，style.height不生效"/>
bindinput="当内容改变"
<textarea  placeholder="" bindlinechange="bindlinechange"/>
bindfocus:当获取焦点
<textarea  placeholder="当获取焦点" value="" bindfocus="bindfocus"/>
bindblur：当失去焦点触发
<textarea  placeholder="当失去焦点" bindblur="bindblur"/>
</view>
事件触发：
<view class="content"  style="color:blue">
{{log}}
</view>

The following is the JS code::

Page({
  data:{
    log:'事件触发'
  },
  //行高改变时
  bindlinechange:function(e){
    var height=e.detail.height;
    var heightRpx=e.detail.heightRpx;
    var lineCount=e.detail.lineCount;
    this.setData({
      log:"height="+height+"  |  heightRpx="+heightRpx+"  |  lineCount="+lineCount
    })
  },
    //文本失去焦点
  bindblur:function(e){
    var value=e.detail.value;
     this.setData({
      log:"bindblur失去改变.获取textarea值="+value
    })
  },
   //文本获取焦点
  bindfocus:function(e){
    var value=e.detail.value;
     this.setData({
      log:"bindfocus获取焦点,获取textarea值="+value
    })
  }
})

The following is the WXSS code: :

.content{
  border:1px black solid;
  margin: 10px;
  font-size: 10pt;
  padding: 10px;
}
textarea{
  border: 1px red solid;
  margin: auto;
  width:100%;
  height: 3em;
  margin-top:5px;
  padding: 3px;
}

Attribute parsing:

The following is the WXML code:

<!--=======属性=======-->
<!--value：输入框内容-->
<textarea value="内容"/>
<!--placeholder：占位符，对输入框内容提示-->
<textarea placeholder="占位符" placeholder-class="占位符静态样式"   placeholder-style="占位符动态样式"/>
<!--disabled：控制标签有效,或者失效状态，在失效状态，不能获取该值-->
<textarea disabled="true"/>
<textarea disabled/> 等同于 <textarea disabled="false"/>
<!--maxlength:内容长度限制,默认140-->
<textarea  maxlength="100"/>
<textarea  maxlength/> 等同于 <textarea  maxlength="140"/>
<!--focus:初始化时，获取输入焦点(目前开发工具暂不支持)-->
<textarea  focus="true"/>
<textarea focus/> 等同于 <textarea focus="false"/>
<!--auto-focus：当界面只有一个textarea,自动获取焦点-->
<textarea   auto-focus="true"/>
<textarea   auto-focus/> 等同于 <textarea auto-focus="false"/>
<!--auto-height：是否自动增高，设置auto-height时，style.height不生效-->
<textarea  auto-height="true"/>
<textarea  auto-height/> 等同于 <textarea auto-height="false"/>
<!--=======事件=======-->
<!--bindlinechange:输入框行数变化时调用 返回参数：height,heightRpx,lineCount-->
<textarea bindlinechange="自己定义函数名"/>
<!--bindfocus:当获取焦点，可用输入状态时触发-->
<textarea bindfocus="自己定义函数名"/>
<!--bindblur：当失去焦点触发-->

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