VUE + Element项目中,你可能不知道的一些技巧

演示地址

  • 表单弹框

    实际的项目中会存在很多的表单弹框,并且有许多是可以复用的,我们可以简单的封装成业务组件。技巧就是利用.sync特性

<Dialog :visible.sync="dialogFormVisible"></Dialog>

<el-dialog @close="close" title="收货地址" :visible.sync="visible">
    <el-form :model="form">
      <el-form-item label="活动名称" :label-width="formLabelWidth">
        <el-input v-model="form.name" auto-complete="off"></el-input>
      </el-form-item>
      <el-form-item label="活动区域" :label-width="formLabelWidth">
        <el-select v-model="form.region" placeholder="请选择活动区域">
          <el-option label="区域一" value="shanghai"></el-option>
          <el-option label="区域二" value="beijing"></el-option>
        </el-select>
      </el-form-item>
    </el-form>
    <div slot="footer" class="dialog-footer">
      <el-button @click="close">取 消</el-button>
      <el-button type="primary" @click="ok">确 定</el-button>
    </div>
  </el-dialog>
export default {
  props: {
    visible: false
  },
  data() {
    return {
      form: {
        name: "",
        region: ""
      },
      formLabelWidth: "120px"
    };
  },
  methods: {
    close() {
      this.$emit("update:visible", false);
    },
    ok() {
      this.$emit("update:visible", false);
    }
  }
};
  • 表单嵌入

    有一些场景,除了表单输入不同,其他的一些逻辑都是一样的,这时候就可以把表单拉出来,做一个判断,这样就能公用一个页面

<el-form :model="form">
  <Forms :data.sync="form"></Forms>
  <el-button @click="close">取 消</el-button>
  <el-button type="primary" @click="ok">确 定</el-button>
</el-form>

//Forms
<div>
    <el-form-item label="活动名称" :label-width="formLabelWidth">
      <el-input v-numberInt:5="data.name" v-model="data.name" auto-complete="off"></el-input>
    </el-form-item>
    <el-form-item label="活动区域" :label-width="formLabelWidth">
      <el-select v-model="data.region" placeholder="请选择活动区域">
        <el-option label="区域一" value="shanghai"></el-option>
        <el-option label="区域二" value="beijing"></el-option>
      </el-select>
    </el-form-item>
</div>
export default {
  props: {
    data: Object
  },
  data() {
    return {
      formLabelWidth: "120px"
    };
  }
};
  • Directive 指令

    有一天,我正在开开心心的写代码的时候,产品突然跟我说,表单仅仅做校验是不够的,我们还要限制用户输入,价格只能输入数字,数量只能输入整数,我听到后整个人就很 高兴说: 我(艹)看(泥)看(马)(当用户傻呀,外星人呀,价格是ABC)

<el-input v-numberInt:5="data.name" v-model="data.name" ></el-input>
//JS
export const numberInt = {
  update: function (el, binding, vnode) {
    let val = binding.value ? binding.value.toString() : ''
    let len = binding.arg
    if (val === '') return
    let reg = new RegExp('^[0-9]{0,' + len + '}$')
    if (!reg.test(val)) {
    // 因为model的原因必须nextTick后去更改才行
      Vue.nextTick(() => {
        vnode.data.model.callback(binding.oldValue)
      })
    }
  }
}
    
  • Line 在容器内铺满网格线
<div class="grid-box">
    <span class="vLine" :style="{left: n * 20 + 'px'}" v-for="n in nCol" :key="'v' + n"></span>
    <span class="hLine" :style="{top: n * 20 + 'px'}" v-for="n in nRow" :key="'h' + n"></span>
</div>
export default {
  name: "Lines",
  data() {
    return {
      nRow: 0,
      nCol: 0
    };
  },
  created() {},
  mounted() {
    this.nRow = Math.ceil(this.$el.offsetHeight / 20);
    this.nCol = Math.ceil(this.$el.offsetWidth / 20);
  },
  methods: {}
};
  • 电子表数字 CrystalNum
<CrystalNum :num="num"></CrystalNum>

<div class="crystalnum" >
      <span v-for="(item, index) in aCount" :key="index" :class="!show && item != oldCount[index]?'animation-flip iconfont icon-'+ item:'iconfont icon-'+ item"></span>
</div>
export default {
  name: "CrystalNum",
  props: {
    num: {
      type: [String, Number],
      default: "0"
    }
  },
  data() {
    return {
      show: true,
      oldCount: ["0"],
      aCount: ["0"]
    };
  },
  computed: {},
  mounted() {},
  watch: {
    num(cur, old) {
      this.show = false;
      this.oldCount = old.toString().split("");
      let num = cur;
      if (typeof num === "number") {
        num = "" + num;
      }
      if (num === "") {
        this.aCount = ["0"];
      } else {
        let aCount = num.split("");
        this.aCount = aCount;
      }
      setTimeout(() => {
        this.show = true;
      }, 1000);
    }
  }
};

有好几个月没碰原来的项目,回头看了下,有很多不足的地方,有一些碰到的问题时间太久,没记录也没什么印象了,回头有实践再更新吧,也欢迎拍砖

演示地址

    原文作者:2ming
    原文地址: https://segmentfault.com/a/1190000015178145
    本文转自网络文章,转载此文章仅为分享知识,如有侵权,请联系博主进行删除。
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