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  1. <template>
  2. <view class="">
  3. <view class="u-sticky-wrap" :class="[elClass]" :style="{
  4. height: fixed ? height + 'px' : 'auto',
  5. backgroundColor: bgColor
  6. }">
  7. <view class="u-sticky" :style="{
  8. position: fixed ? 'fixed' : 'static',
  9. top: stickyTop + 'px',
  10. left: left + 'px',
  11. width: width == 'auto' ? 'auto' : width + 'px',
  12. zIndex: uZIndex
  13. }">
  14. <slot></slot>
  15. </view>
  16. </view>
  17. </view>
  18. </template>
  19. <script>
  20. /**
  21. * sticky 吸顶
  22. * @description 该组件与CSS中position: sticky属性实现的效果一致,当组件达到预设的到顶部距离时, 就会固定在指定位置,组件位置大于预设的顶部距离时,会重新按照正常的布局排列。
  23. * @tutorial https://www.uviewui.com/components/sticky.html
  24. * @property {String Number} offset-top 吸顶时与顶部的距离,单位rpx(默认0)
  25. * @property {String Number} index 自定义标识,用于区分是哪一个组件
  26. * @property {Boolean} enable 是否开启吸顶功能(默认true)
  27. * @property {String} bg-color 组件背景颜色(默认#ffffff)
  28. * @property {String Number} z-index 吸顶时的z-index值(默认970)
  29. * @property {String Number} h5-nav-height 导航栏高度,自定义导航栏时(无导航栏时需设置为0),需要传入此值,单位px(默认44)
  30. * @event {Function} fixed 组件吸顶时触发
  31. * @event {Function} unfixed 组件取消吸顶时触发
  32. * @example <u-sticky offset-top="200"><view>塞下秋来风景异,衡阳雁去无留意</view></u-sticky>
  33. */
  34. export default {
  35. name: "u-sticky",
  36. props: {
  37. // 吸顶容器到顶部某个距离的时候,进行吸顶,在H5平台,NavigationBar为44px
  38. offsetTop: {
  39. type: [Number, String],
  40. default: 0
  41. },
  42. //列表中的索引值
  43. index: {
  44. type: [Number, String],
  45. default: ''
  46. },
  47. // 是否开启吸顶功能
  48. enable: {
  49. type: Boolean,
  50. default: true
  51. },
  52. // h5顶部导航栏的高度
  53. h5NavHeight: {
  54. type: [Number, String],
  55. default: 44
  56. },
  57. // 吸顶区域的背景颜色
  58. bgColor: {
  59. type: String,
  60. default: '#ffffff'
  61. },
  62. // z-index值
  63. zIndex: {
  64. type: [Number, String],
  65. default: ''
  66. }
  67. },
  68. data() {
  69. return {
  70. fixed: false,
  71. height: 'auto',
  72. stickyTop: 0,
  73. elClass: this.$u.guid(),
  74. left: 0,
  75. width: 'auto',
  76. };
  77. },
  78. watch: {
  79. offsetTop(val) {
  80. this.initObserver();
  81. },
  82. enable(val) {
  83. if (val == false) {
  84. this.fixed = false;
  85. this.disconnectObserver('contentObserver');
  86. } else {
  87. this.initObserver();
  88. }
  89. }
  90. },
  91. computed: {
  92. uZIndex() {
  93. return this.zIndex ? this.zIndex : this.$u.zIndex.sticky;
  94. }
  95. },
  96. mounted() {
  97. this.initObserver();
  98. },
  99. methods: {
  100. initObserver() {
  101. if (!this.enable) return;
  102. // #ifdef H5
  103. this.stickyTop = this.offsetTop != 0 ? uni.upx2px(this.offsetTop) + this.h5NavHeight : this.h5NavHeight;
  104. // #endif
  105. // #ifndef H5
  106. this.stickyTop = this.offsetTop != 0 ? uni.upx2px(this.offsetTop) : 0;
  107. // #endif
  108. this.disconnectObserver('contentObserver');
  109. this.$uGetRect('.' + this.elClass).then((res) => {
  110. this.height = res.height;
  111. this.left = res.left;
  112. this.width = res.width;
  113. this.$nextTick(() => {
  114. this.observeContent();
  115. });
  116. });
  117. },
  118. observeContent() {
  119. this.disconnectObserver('contentObserver');
  120. const contentObserver = this.createIntersectionObserver({
  121. thresholds: [0.95, 0.98, 1]
  122. });
  123. contentObserver.relativeToViewport({
  124. top: -this.stickyTop
  125. });
  126. contentObserver.observe('.' + this.elClass, res => {
  127. if (!this.enable) return;
  128. this.setFixed(res.boundingClientRect.top);
  129. });
  130. this.contentObserver = contentObserver;
  131. },
  132. setFixed(top) {
  133. const fixed = top < this.stickyTop;
  134. if (fixed) this.$emit('fixed', this.index);
  135. else if(this.fixed) this.$emit('unfixed', this.index);
  136. this.fixed = fixed;
  137. },
  138. disconnectObserver(observerName) {
  139. const observer = this[observerName];
  140. observer && observer.disconnect();
  141. },
  142. },
  143. beforeDestroy() {
  144. this.disconnectObserver('contentObserver');
  145. }
  146. };
  147. </script>
  148. <style scoped lang="scss">
  149. @import "../../libs/css/style.components.scss";
  150. .u-sticky {
  151. z-index: 9999999999;
  152. }
  153. </style>