Vue read-only box binding value

In Vue development, we usually need to render the data in the template so that the page can be displayed. Sometimes in order to prevent users from modifying data at will, we need to set certain input boxes or text boxes to read-only status. In this case, we need to bind the value of the read-only box. This article will introduce how to bind the value of a read-only box in Vue development.

1. What is a read-only box

A read-only box refers to a type of form input box in which the user can only view the content in the box and cannot modify the content in the box. Generally speaking, Said is used to present data or information.

2. Problems with using v-model

In vue, we can use v-model to bind forms that users can modify. However, for read-only boxes, we cannot use v-model. This is because v-model essentially performs two-way binding on variables. When the user changes the value of the input box, the value of the variable will also change accordingly. For read-only boxes, we hope that users can only see the value of the variable and not modify it at will, so v-model is not suitable for read-only boxes.

3. Solution: Use v-bind to bind the value

Since v-model cannot be used, we need to find another solution to bind the value of the read-only box. At this time, we need to use the v-bind instruction to bind.

In Vue, v-bind can bind any HTML attribute, including value. This feature can be used for binding values ​​of read-only boxes.

We can use v-bind:value on the label of the read-only box to bind the value of the read-only box:

<input type="text" :value="readOnlyValue" readonly />

The v-bind directive is used here, and the value attribute is Set the value readOnlyValue to be displayed in the read-only box, and finally add the readonly attribute to ensure that the read-only box cannot be changed. Then just define readOnlyValue in Vue's data, and you can easily bind the value to the read-only box.

data() {
  return {
    readOnlyValue: '只读框的值'
  };
},

4. Binding calculated attribute values

In some cases, we need to perform some processing on the data, and then bind the processed value to the read-only box. At this time, we can use calculated properties to generate binding values.

First, define the data source to be converted in Vue's data, such as the value before conversion:

let valueToTrans = '123';

Next, define a calculated attribute, and convert the value in the calculated attribute , for example:

computed: {
  transValue() {
    return valueToTrans + 'px';
  },
},

Finally, use v-bind:value on the label of the read-only box to bind the calculated property transValue to the read-only box:

<input type="text" :value="transValue" readonly />

In this way, we can use calculation The property converts the data and binds it to the read-only box.

Summary

Using v-model is a common binding method in Vue development, but for non-editable input boxes such as read-only boxes, we need to use other methods for binding. This article introduces a solution in Vue development: using the v-bind directive to bind the value of the read-only box. At the same time, it also introduces how to use calculated properties to process data and then bind it to a read-only box. These two methods can effectively solve the problem of binding read-only boxes in Vue development.

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