Front/vue/guide/custom-directives.html

<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    .demo {
      background: lightcyan;
      margin: 5px;
    }
  </style>
</head>
<body>
  <script src="https://cdn.jsdelivr.net/npm/vue"></script>
  <!-- 自定义指令 -->
  <div id="app-1" class="demo">
    <input type="text" v-focus-g>
    <!-- <input type="text" v-focus-l> -->
    
  </div>
  <script>
    Vue.directive('focus-g', {
      inserted(el) {
        el.focus();
      }
    })
    var app1 = new Vue({
      el: '#app-1',
      data: {

      },
      directives: {
        'focus-l': {
          inserted: function(el) {
            el.focus();
          }
        }
      }
    })
  </script>

  <!-- 使用自定义属性 -->
  <div id="app-2" class="demo" v-demo:foo.a.b='message'>
  </div>
  <script>
    var app2 = new Vue({
      el: '#app-2',
      data: {
        message: 'hello!'
      },
      directives: {
        demo: {
          bind: function(el, binding, vnode) {
            var s = JSON.stringify;
            el.innerHTML = `
              name: ${s(binding.name)} <br>
              value: ${s(binding.value)} <br>
              expression: ${s(binding.expression)} <br>
              argument: ${s(binding.argument)} <br>
              modifiers: ${s(binding.modifiers)} <br>
              vnode keys: ${s(Object.keys(vnode).join(','))} <br>
            `
          }
        }
      }
    })
  </script>

  <!-- 动态指令参数 -->
  <div id="app-3" class="demo">
    <p>scroll let the page</p>
    <p v-pin:[direction]='200'>i am pinned onto the page at 200px to the left</p>
  </div>
  <script>
    var app3 = new Vue({
      el: '#app-3',
      data: function() {
        return {
          direction: 'left'
        }
      },
      directives: {
        pin: {
          bind: function(el, binding, vnode) {
            el.style.position = 'fixed';
            var d = (binding.arg == 'left' ? 'left' : 'top');
            el.style[d] = binding.value + 'px';
          }
        }
      }
    });
  </script>

  <!-- 函数简写 -->
  <script>
    new Vue({
      directives: {
        'color-swatch': function(el, binding) {
          el.style.backgroundColor = binding.value;
        }
      }
    })
  </script>

  <!-- 对象字面量 -->
  <div id="app-4" class="demo">
    <div v-demo1="{ color: color, text: 'hello!' }">test directives</div>
  </div>
    
  <script>
    var app4 = new Vue({
      el: '#app-4',
      data: function() {
        return {
          color: 'white',
          text: 'hello'
        }
      },
      directives: {
        demo1:  function(el, binding) {
          console.log(binding.value.color);
          console.log(binding.value.text);
        }
      }
    })
  </script>


</body>
</html>