anchor.vue
7.06 KB
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
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
<template>
<component :is="wrapperComponent" :offset-top="offsetTop" :offset-bottom="offsetBottom" @on-change="handleAffixStateChange">
<div :class="`${prefix}-wrapper`" :style="wrapperStyle">
<div :class="`${prefix}`">
<div :class="`${prefix}-ink`">
<span v-show="showInk" :class="`${prefix}-ink-ball`" :style="{top: `${inkTop}px`}"></span>
</div>
<slot></slot>
</div>
</div>
</component>
</template>
<script>
import { scrollTop, findComponentsDownward, sharpMatcherRegx } from '../../utils/assist';
import { on, off } from '../../utils/dom';
export default {
name: 'Anchor',
provide () {
return {
anchorCom: this
};
},
data () {
return {
prefix: 'ivu-anchor',
isAffixed: false, // current affixed state
inkTop: 0,
animating: false, // if is scrolling now
currentLink: '', // current show link => #href -> currentLink = #href
currentId: '', // current show title id => #href -> currentId = href
scrollContainer: null,
scrollElement: null,
titlesOffsetArr: [],
wrapperTop: 0,
upperFirstTitle: true
};
},
props: {
affix: {
type: Boolean,
default: true
},
offsetTop: {
type: Number,
default: 0
},
offsetBottom: Number,
bounds: {
type: Number,
default: 5
},
// container: [String, HTMLElement], // HTMLElement 在 SSR 下不支持
container: null,
showInk: {
type: Boolean,
default: false
},
scrollOffset: {
type: Number,
default: 0
}
},
computed: {
wrapperComponent () {
return this.affix ? 'Affix' : 'div';
},
wrapperStyle () {
return {
maxHeight: this.offsetTop ? `calc(100vh - ${this.offsetTop}px)` : '100vh'
};
},
containerIsWindow () {
return this.scrollContainer === window;
}
},
methods: {
handleAffixStateChange (state) {
this.isAffixed = this.affix && state;
},
handleScroll (e) {
this.upperFirstTitle = e.target.scrollTop < this.titlesOffsetArr[0].offset;
if (this.animating) return;
this.updateTitleOffset();
const scrollTop = document.documentElement.scrollTop || document.body.scrollTop || e.target.scrollTop;
this.getCurrentScrollAtTitleId(scrollTop);
},
handleHashChange () {
const url = window.location.href;
const sharpLinkMatch = sharpMatcherRegx.exec(url);
if (!sharpLinkMatch) return;
this.currentLink = sharpLinkMatch[0];
this.currentId = sharpLinkMatch[1];
},
handleScrollTo () {
const anchor = document.getElementById(this.currentId);
const currentLinkElementA = document.querySelector(`a[data-href="${this.currentLink}"]`);
let offset = this.scrollOffset;
if (currentLinkElementA) {
offset = parseFloat(currentLinkElementA.getAttribute('data-scroll-offset'));
}
if (!anchor) return;
const offsetTop = anchor.offsetTop - this.wrapperTop - offset;
this.animating = true;
scrollTop(this.scrollContainer, this.scrollElement.scrollTop, offsetTop, 600, () => {
this.animating = false;
});
this.handleSetInkTop();
},
handleSetInkTop () {
const currentLinkElementA = document.querySelector(`a[data-href="${this.currentLink}"]`);
if (!currentLinkElementA) return;
const elementATop = currentLinkElementA.offsetTop;
const top = (elementATop < 0 ? this.offsetTop : elementATop);
this.inkTop = top;
},
updateTitleOffset () {
const links = findComponentsDownward(this, 'AnchorLink').map(link => {
return link.href;
});
const idArr = links.map(link => {
return link.split('#')[1];
});
let offsetArr = [];
idArr.forEach(id => {
const titleEle = document.getElementById(id);
if (titleEle) offsetArr.push({
link: `#${id}`,
offset: titleEle.offsetTop - this.scrollElement.offsetTop
});
});
this.titlesOffsetArr = offsetArr;
},
getCurrentScrollAtTitleId (scrollTop) {
let i = -1;
let len = this.titlesOffsetArr.length;
let titleItem = {
link: '#',
offset: 0
};
scrollTop += this.bounds;
while (++i < len) {
let currentEle = this.titlesOffsetArr[i];
let nextEle = this.titlesOffsetArr[i + 1];
if (scrollTop >= currentEle.offset && scrollTop < ((nextEle && nextEle.offset) || Infinity)) {
titleItem = this.titlesOffsetArr[i];
break;
}
}
this.currentLink = titleItem.link;
this.handleSetInkTop();
},
getContainer () {
this.scrollContainer = this.container ? (typeof this.container === 'string' ? document.querySelector(this.container) : this.container) : window;
this.scrollElement = this.container ? this.scrollContainer : (document.documentElement || document.body);
},
removeListener () {
off(this.scrollContainer, 'scroll', this.handleScroll);
off(window, 'hashchange', this.handleHashChange);
},
init () {
// const anchorLink = findComponentDownward(this, 'AnchorLink');
this.handleHashChange();
this.$nextTick(() => {
this.removeListener();
this.getContainer();
this.wrapperTop = this.containerIsWindow ? 0 : this.scrollElement.offsetTop;
this.handleScrollTo();
this.handleSetInkTop();
this.updateTitleOffset();
if (this.titlesOffsetArr[0]) {
this.upperFirstTitle = this.scrollElement.scrollTop < this.titlesOffsetArr[0].offset;
}
on(this.scrollContainer, 'scroll', this.handleScroll);
on(window, 'hashchange', this.handleHashChange);
});
}
},
watch: {
'$route' () {
this.handleHashChange();
this.$nextTick(() => {
this.handleScrollTo();
});
},
container () {
this.init();
},
currentLink (newHref, oldHref) {
this.$emit('on-change', newHref, oldHref);
}
},
mounted () {
this.init();
},
beforeDestroy () {
this.removeListener();
}
};
</script>