all files / textField/ enhancedTextarea.vue

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
//
//
//
//
//
//
//
 
export default {
  props: {
    placeholder: {
      type: String
    },
    value: {
      type: String
    },
    rows: {
      type: Number,
      default: 1
    },
    rowsMax: {
      type: Number
    },
    disabled: {
      type: Boolean,
      default: false
    }
  },
  methods: {
    resizeTextarea () {
      let element = this.$refs.textarea
      if (!element) return
      let hiddenEl = this.$refs.textareaHidden
      let lineHeight = window.getComputedStyle(element, null).getPropertyValue('line-height')
      lineHeight = Number(lineHeight.substring(0, lineHeight.indexOf('px')))
      let pt = window.getComputedStyle(element, null).getPropertyValue('padding-top')
      pt = Number(pt.substring(0, pt.indexOf('px')))
      let pd = window.getComputedStyle(element, null).getPropertyValue('padding-bottom')
      pd = Number(pd.substring(0, pd.indexOf('px')))
      let minHeight = pd + pt + lineHeight * this.rows
      let maxHeight = pd + pt + lineHeight * (this.rowsMax || 0)
      let height = hiddenEl.scrollHeight
      element.style.height = (height < minHeight ? minHeight : height > maxHeight && maxHeight > 0 ? maxHeight : height) + 'px'
    },
    handleInput (e) {
      this.$emit('change', e.target.value)
    },
    handleFocus (e) {
      this.$emit('focus', e)
    },
    handleBlur (e) {
      this.$emit('blur', e)
    }
  },
  mounted () {
    this.resizeTextarea()
  },
  watch: {
    value (val, oldVal) {
      if (val === oldVal) return
      this.$nextTick(() => {
        this.resizeTextarea()
      })
    }
  }
}