下面是“基于element-ui组件手动实现单选和上传功能”的完整攻略:
前言
element-ui是一款非常流行的UI组件库,提供了很多常用的组件和功能。但是在实际的开发中,我们有时候需要根据自己的业务需求对组件进行一些改造或扩展。本攻略将详细讲解如何基于element-ui组件手动实现单选和上传功能。
单选功能实现
目标
我们需要实现一个单选框组件,在选中某个选项时,其他选项都需要变为未选中状态。
实现
首先,我们可以使用element-ui提供的radio组件作为基础,然后再进行扩展。具体步骤如下:
- 创建一个单选框组件(RadioGroup),继承自element-ui的RadioGroup组件。
<template>
<el-radio-group v-model="selectedValue">
<slot></slot>
</el-radio-group>
</template>
<script>
import { RadioGroup } from 'element-ui';
export default {
name: 'MyRadioGroup',
extends: RadioGroup,
data() {
return {
selectedValue: ''
};
}
};
</script>
- 在RadioGroup组件中使用插槽来渲染子选项(Radio)。
<template>
<el-radio-group v-model="selectedValue">
<slot></slot>
</el-radio-group>
</template>
- 在子选项(Radio)中添加点击事件,当点击某个选项时将其他选项设置为未选中。
<template>
<el-radio @click.native="handleClick"
v-bind="$attrs"
:label="label">
<slot></slot>
</el-radio>
</template>
<script>
import { Radio } from 'element-ui';
export default {
name: 'MyRadio',
extends: Radio,
methods: {
handleClick() {
this.$emit('input', this.label);
this.$parent.$children
.filter((c) => c !== this)
.forEach((c) => (c.selected = false));
}
}
};
</script>
- 最后,在使用组件的地方,我们可以如下方式渲染:
<template>
<my-radio-group v-model="selectedValue">
<my-radio label="选项1">选项1</my-radio>
<my-radio label="选项2">选项2</my-radio>
<my-radio label="选项3">选项3</my-radio>
</my-radio-group>
</template>
<script>
import MyRadioGroup from '@/components/MyRadioGroup.vue';
import MyRadio from '@/components/MyRadio.vue';
export default {
components: { MyRadioGroup, MyRadio },
data() {
return {
selectedValue: ''
};
}
};
</script>
上传功能实现
目标
我们需要实现一个上传文件的组件,用户可以选择文件并上传到服务器,同时支持拖拽上传。
实现
和上面的单选框组件一样,我们可以使用element-ui提供的Upload组件作为基础,然后再进行扩展。具体步骤如下:
- 创建一个上传文件组件,继承自element-ui的Upload组件。
<template>
<div v-drag-and-drop="handleDragAndDrop">
<slot name="tip"></slot>
<el-upload :headers="headers"
:action="action"
:data="data"
:multiple="multiple"
:show-file-list="showFileList"
:auto-upload="autoUpload"
:on-preview="onPreview"
:on-remove="onRemove"
:on-progress="onProgress"
:on-success="onSuccess"
:on-error="onError">
<slot></slot>
<el-button slot="trigger">
<i class="el-icon-upload"></i>
<span>{{ buttonText }}</span>
</el-button>
<el-button v-if="showClearButton"
slot="append"
@click.stop="handleClear">
{{ clearButtonText }}
</el-button>
</el-upload>
</div>
</template>
<script>
import { Upload } from 'element-ui';
import Vue from 'vue';
export default {
name: 'MyUpload',
extends: Upload,
props: {
showClearButton: {
type: Boolean,
default: false
},
clearButtonText: {
type: String,
default: '清空文件'
}
},
data() {
return {
headers: {},
action: '',
data: {},
multiple: false,
showFileList: true,
autoUpload: false,
buttonText: '选择文件'
};
},
methods: {
handleClear() {
this.$refs.upload.clearFiles();
},
handleDragAndDrop(e) {
if (e.type === 'dragover') {
e.preventDefault();
} else if (e.type === 'drop') {
e.preventDefault();
const files = e.dataTransfer.files;
for (let i = 0; i < files.length; i++) {
const file = files.item(i);
const xhr = new XMLHttpRequest();
const formData = new FormData();
formData.append('file', file);
xhr.upload.addEventListener('progress', (e) => {
if (e.lengthComputable) {
const percent = Math.round((e.loaded / e.total) * 100);
Vue.set(file, 'percent', percent);
}
});
xhr.addEventListener('load', () => {
const response = JSON.parse(xhr.responseText);
Vue.set(file, 'url', response.data.url);
});
xhr.open('POST', this.action, true);
xhr.setRequestHeader('Authorization', 'Bearer token');
xhr.send(formData);
}
}
}
}
};
</script>
- 在MyUpload组件中添加新的props和methods,用于在拖拽上传时进行处理。
<script>
export default {
name: 'MyUpload',
extends: Upload,
props: {
showClearButton: {
type: Boolean,
default: false
},
clearButtonText: {
type: String,
default: '清空文件'
}
},
data() {
return {
headers: {},
action: '',
data: {},
multiple: false,
showFileList: true,
autoUpload: false,
buttonText: '选择文件'
};
},
methods: {
handleClear() {
this.$refs.upload.clearFiles();
},
handleDragAndDrop(e) {
if (e.type === 'dragover') {
e.preventDefault();
} else if (e.type === 'drop') {
e.preventDefault();
const files = e.dataTransfer.files;
for (let i = 0; i < files.length; i++) {
const file = files.item(i);
const xhr = new XMLHttpRequest();
const formData = new FormData();
formData.append('file', file);
xhr.upload.addEventListener('progress', (e) => {
if (e.lengthComputable) {
const percent = Math.round((e.loaded / e.total) * 100);
Vue.set(file, 'percent', percent);
}
});
xhr.addEventListener('load', () => {
const response = JSON.parse(xhr.responseText);
Vue.set(file, 'url', response.data.url);
});
xhr.open('POST', this.action, true);
xhr.setRequestHeader('Authorization', 'Bearer token');
xhr.send(formData);
}
}
}
}
};
</script>
- 在使用组件的地方,我们可以如下方式渲染:
<template>
<my-upload
action="/upload"
:before-upload="beforeUpload"
:on-progress="handleProgress"
:on-success="handleSuccess"
:on-error="handleError"
:show-clear-button="true"
:clear-button-text="'清空记录'">
<div class="my-upload-header">
<span>上传文件</span>
</div>
<div class="my-upload-content">
<el-button>选择文件</el-button>
</div>
</my-upload>
</template>
<script>
import MyUpload from '@/components/MyUpload.vue';
export default {
components: { MyUpload },
methods: {
beforeUpload(file) {
console.log('before upload', file);
},
handleProgress(event, file, fileList) {
console.log('uploading', file, fileList);
},
handleSuccess(response, file, fileList) {
console.log('upload success', response, file, fileList);
},
handleError(error, file, fileList) {
console.log('upload error', error, file, fileList);
}
}
};
</script>
以上就是“基于element-ui组件手动实现单选和上传功能”的完整攻略。
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