How to pass date value to backend in vue

Vue, as a popular JavaScript framework, provides us with a convenient and fast front-end development model. However, in actual development, we often need to pass the data rendered by Vue to the back-end for processing, such as date values. Today we will talk about how to pass the date value in Vue to the backend.

1. Why should the date value be passed to the backend?

In actual development, it is often necessary to complete the selection and input of the date on the front end, and then pass the selected or entered date value to The backend handles the processing. For example, if we need to submit a date in a form on the front end, then this date needs to be passed to the back-end interface for processing, stored in the database or other operations.

2. Date processing methods in Vue

Vue provides many convenient methods for processing dates. We can process dates through built-in filters or custom methods. For example, we can use filters to format dates into the format we need:

<template>
  <div>
    {{ date | format('YYYY-MM-DD') }}
  </div>
</template>

<script>
export default {
  data() {
    return {
      date: '2021-09-01'
    }
  },
  filters: {
    format(value, formatStr) {
      return moment(value).format(formatStr)
    }
  }
}
</script>

In this example, we use moment.js, a commonly used date processing library, to format dates through filters. 'YYYY-MM-DD' form. This filter can be reused in other components.

3. Date value delivery method

In Vue, we can pass the date value to the backend in the following ways:

1. GET request parameter delivery method

For relatively simple scenarios, we can pass the date value to the backend through GET request parameters. For example, if we need to query a user's data based on the selected date, we can pass the date value to the backend in the following way:

<template>
  <div>
    <input type="date" v-model="date">
    <button @click="search">查询</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      date: ''
    }
  },
  methods: {
    search() {
      const url = `/user?date=${this.date}`
      // axios发送GET请求
    }
  }
}
</script>

In this example, we bind it through the v-model of the input tag Date value, then concatenate the URL in the click event of the query button, and pass the date value as a query parameter to the GET request.

2. POST request parameter delivery method

If the data passed is more complex, the date value can be passed to the backend through POST request parameters. This method can be passed More data information.

<template>
  <div>
    <input type="date" v-model="birthday">
    <button @click="save">保存</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      birthday: ''
    }
  },
  methods: {
    save() {
      const params = {
        name: '张三',
        gender: '男',
        birthday: this.birthday
      }
      // axios发送POST请求
    }
  }
}
</script>

In this example, we create an object params, use the user's name, gender, birthday and other information as attribute values, and then send this object as a POST request parameter in the click event of the save button. rear end.

3. Request body delivery method

The request body delivery method is usually used to pass complex data objects, such as forms, files, etc. This method can be passed through the FormData object , so that the backend can process it.

<template>
  <div>
    <form @submit.prevent="submitForm">
      <label>姓名</label>
      <input type="text" v-model="name">
      <label>生日</label>
      <input type="date" v-model="birthday">
      <button type="submit">提交</button>
    </form>
  </div>
</template>

<script>
export default {
  data() {
    return {
      name: '',
      birthday: ''
    }
  },
  methods: {
    submitForm() {
      const formData = new FormData()
      formData.append('name', this.name)
      formData.append('birthday', this.birthday)
      // axios发送POST请求
    }
  }
}
</script>

In this example, we trigger the submitForm method through the submit event of the form form, create a FormData object in the method, add the input value of the form to the object as an attribute value, and then use this object as The request body of the POST request is sent to the backend.

4. Summary

In Vue, we can pass the date value to the backend through GET request parameters, POST request parameters and request body. Different delivery methods are suitable for different scenarios, and you need to choose according to the actual situation. At the same time, we can also use some commonly used data processing libraries to conveniently handle operations such as date formatting and improve development efficiency. Hope this article helps you!

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