Provide more useful filters/directives for vue.js

if you use vue 2.0+ ,you should use bind value with out property embed with .

//good 
<input type="text" v-focus="codeFocus" maxlength="6"/>


//error!can not work! 
<input type="text" v-focus="form.codeFocus" maxlength="6"/>

the reason is,in vue 2.0+,directive can not modify vm values. I found a way to modify simple property,but embed property not working.

##Filters

• hideString:

  • usage:

      //html
      <li>usage of hideString: {{phoneNo}}=> {{ phoneNo|hideString 3 4 "*"}}</li>
      
      //.js
       var vm = new Vue({
              el: '#demo',
              data: {
                  phoneNo:"13312345678"
              }
          })

    * will render:
    <li>usage of hideString: 13312345678=&gt; 133****678</li>
  

• focus:

  • description:

    • In Vue,there is no built-in binding like "v-blur" or "v-focus",so i make one.
    • it should only be used with <input> tag.

  • usage:

      
          //html
          <li><input v-focus="hasFocus" type="text" style="width:50px;" value="blur me!"> HasFocus: {{hasFocus}}</li>
          
          //.js
           var vm = new Vue({
                  el: '#demo',
                  data: {
                      hasFocus:false
                  }
              })
      
      ```

• maxStringLen:

  • description:
    • in project,we always need to limit string's length,this filter can help you do this easily
  • usage:

      //html
      <li>usage of maxStringLen: {{longString}}=> {{ longString|maxStringLen 12 "..."}}</li>
      
      //.js
       var vm = new Vue({
              el: '#demo',
              data: {
                  longString:"i am a long long string!"
              }
          })

  • will render:
• usage of maxStringLen: i am a long long string!=> i am a long ...

• formatDate:

  • description:
    • this filter can parse Date or Date String into other format
  • usage:

      //in html:
      <li>format ="elapsed": {{date}}=> {{ date|formatDate "elapsed" }}</li>
      
      //in js:
      var vm = new Vue({
              el: '#demo',
              data: {
                  date:new Date("2016-07-10 10:00:00")
              }
          })

  • will render
• format ="elapsed": Sun Jul 10 2016 10:00:00 GMT+0800 (CST)=> 3天前
* format available: * "elapsed":this formatter will calculate the time elapsed since the Date
• format need to develop:
  • "yyyy-MM-dd HH:mm:sss" :

##Directives

• v-toggle-event:

  • description:
    • this directive can bind an event to an prop of vm,every time event fired,the binded value will change to opposite.
    • it always used in checkbox-like-control situation.
  • usage:

      //in html 
      <li><button v-toggle-event:click="val">click me to toggle value</button>{{val}}</li>
      
      //in js
      var vm = new Vue({
              el: '#demo',
              data: {
                  val:false
              }
          })

##Demo There is demo which can show all the features. have fun with them ^_^