How to add dynamically attribute in VueJs

问题

I'm using vuejs and I wanna know how to have control on inputs (add disabled attribute when necessary). Is there any way to add dynamically attribute in vuejs ? Below my Textfield component :

    <template>
     <input type="text" placeholder="{{ placeholder }}" v-model="value">
    </template>
    <script>
    export default  {
      props: {
       disabled: {type: Boolean, default: false},
       placeholder: {type: String, default: ""},
       value: {twoWay: true, default: ""}
      }
     }
    </script>

Usage :

<textfield placeholder="Name" value.sync="el.name" :disabled="true"></textfield>

回答1:

You can bind it to a variable using v-bind:disabled="foo" or :disabled="foo" for short:

<textfield label="Name" value.sync="el.name" :disabled="myVar">

Then in Vue you can just set this.myVar = true and it will disable the input.

Edit: add this to your template:

<template>
  <input type="text" :disabled="disabled" placeholder="{{ placeholder }}" v-model="value">
</template>

回答2:

base one condition we can define or change attributes in vue

Please refer official document for the same https://vuejs.org/v2/guide/syntax.html#Attributes

回答3:

I am trying to figure out how to set the attribute of the html tags from the array value dynamically when using the Vue v-for loop.

What I am going to show:

Example

1. There are 3 div elements with different background colors from array value(not static).

2. Each divs have a input tag and change the value when the user input value

   • The first div's input converts lowercase to uppercase.
   • second represents the mood, if enter 'happy', present 'good'. if enter 'sad', output 'bad'
   • The third div input doubles the input value.
   {{ box.outputData }} Rounded Box

   new Vue({
    el: "#app",
     data: {
       isRounded: false,
         boxes: [
           {
             inputData: "",
             outputData: "",
             color: "green",
             operation: "uppercase"
           },
           {
             inputData: "",
             outputData: "",
             color: "red",
             operation: "feeling"
           },
           {
             inputData: "",
             outputData: "",
             color: "blue",
             operation: "multiple"
           }
         ],
         feeling: {
           good: ["happy", "joyful", "calm"],
           bad: ["sad", "mad", "depressed"]
         }
     },
     methods: {
       toggle: function(todo){
           todo.done = !todo.done
       }
     },
     watch: {
       boxes: {
         deep: true,
         immediate: true,
         handler: function(val) {
           this.boxes.map(box => {
             if (box.operation === "uppercase")
               box.outputData = box.inputData.toUpperCase();
             else if (box.operation === "feeling") {
               box.outputData = this.feeling.good.includes(box.inputData)
                 ? "GOOD"
                 : this.feeling.bad.includes(box.inputData)
                 ? "BAD"
                 : "";
             } else if (box.operation === "multiple") {
               if (box.inputData == "") box.outputData = "";
               else box.outputData = parseInt(box.inputData) * 2;
             }
           });
         }
       }
     },
     mounted() {
       for (var i = 0; i < this.numBox; i++) {
         this.boxValue[i] = "";
         this.bxData[i] = "";
       }
     },
   })
   
   
   
   .clearfix{
    clear: both;
   }
   .full-width{
     width:100%;
   }
   input {
     background: transparent;
     text-decoration: underline;
     color: white;
     border: none;
     text-align: center;
     font-size:30px;
   }
   .box {
     float:left;
     color: white;
     width: 24%;
     margin-right: 1%;
     padding: 20px;
     background: blue;
     height: 100px;
   }
   .box-output {
     width: 100%;
     text-align: center;
     font-size:30px;
   }
   .box-rounded {
     border-radius: 50px;
   }
   

来源：https://stackoverflow.com/questions/39247411/how-to-add-dynamically-attribute-in-vuejs