harmony 鸿蒙picker-view

2023-06-24
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picker-view

The <picker-view> component provides the view that shows an embedded scrollable selector on the screen.

NOTE

This component is supported since API version 4. Updates will be marked with a superscript to indicate their earliest API version.

Child Components

Not supported

Attributes

Name	Type	Default Value	Mandatory	Description
type	string	text	No	Type of the scrollable selector, which cannot be changed dynamically. Available values are as follows: - text: text selector. - time: time selector.
id	string	-	No	Unique ID of the component.
style	string	-	No	Style declaration of the component.
class	string	-	No	Style class of the component, which is used to refer to a style table.
ref	string	-	No	Reference information of child elements, which is registered with the parent component on $refs.

Text selector (type is text)

Name	Type	Default Value	Mandatory	Description
range	Array	-	No	Value range of the text selector. Use data binding, for example, range = {{data}}, to specify the range. Declare the corresponding variable in the JavaScript: data: [“15”, “20”, “25”].
selected	string	0	No	Default value of the text selector. The value is the index of range.

Time selector (type is time)

Name	Type	Default Value	Mandatory	Description
selected	string	00:00	No	Default value of the time selector, in the format of HH:mm.

Events

Text selector (type is text)

Name	Parameter	Description
change	{ newValue: newValue, newSelected: newSelected }	Triggered when a value is specified for the text selector.

Time selector (type is time)

Name	Parameter	Description
change	{ hour: hour, minute: minute}	Triggered when a value is specified for the time selector.

Styles

Name	Type	Default Value	Mandatory	Description
color	<color>	#808080	No	Font color of a candidate item.
font-size	<length>	30px	No	Font size of a candidate item. The value is of the length type, in pixels.
selected-color	<color>	#ffffff	No	Font color of the selected item.
selected-font-size	<length>	38px	No	Font size of the selected item. The value is of the length type, in pixels.
selected-font-family	string	HYQiHei-65S	No	Font type of the selected item.
font-family	string	HYQiHei-65S	No	Font type of an item.
width	<length> \|<percentage>⁵⁺	-	No	Component width. If this attribute is not set, the default value 0 is used.
height	<length> \|<percentage>⁵⁺	-	No	Component height. If this attribute is not set, the default value 0 is used.
padding	<length>	0	No	Shorthand attribute to set the padding for all sides. The attribute can have one to four values: - If you set only one value, it specifies the padding for all the four sides. - If you set two values, the first value specifies the top and bottom padding, and the second value specifies the left and right padding. - If you set three values, the first value specifies the top padding, the second value specifies the left and right padding, and the third value specifies the bottom padding. - If you set four values, they respectively specify the padding for top, right, bottom, and left sides (in clockwise order).
padding-[left\|top\|right\|bottom]	<length>	0	No	Left, top, right, and bottom padding.
margin	<length> \|<percentage>⁵⁺	0	No	Shorthand attribute to set the margin for all sides. The attribute can have one to four values: - If you set only one value, it specifies the margin for all the four sides. - If you set two values, the first value specifies the top and bottom margins, and the second value specifies the left and right margins. - If you set three values, the first value specifies the top margin, the second value specifies the left and right margins, and the third value specifies the bottom margin. - If you set four values, they respectively specify the margin for top, right, bottom, and left sides (in clockwise order).
margin-[left\|top\|right\|bottom]	<length> \|<percentage>⁵⁺	0	No	Left, top, right, and bottom margins.
border-width	<length>	0	No	Shorthand attribute to set the margin for all sides.
border-color	<color>	black	No	Shorthand attribute to set the color for all borders.
border-radius	<length>	-	No	Radius of round-corner borders.
background-color	<color>	-	No	Background color.
display	string	flex	No	How and whether to display the box containing an element. Available values are as follows: - flex: flexible layout - none: not rendered
[left\|top]	<length> \|<percentage>⁶⁺	-	No	Edge of the element. - left: left edge position of the element. This attribute defines the offset between the left edge of the margin area of a positioned element and left edge of its containing block. - top: top edge position of the element. This attribute defines the offset between the top edge of a positioned element and that of a block included in the element.

Example

<!-- xxx.hml -->
<div class="container" @swipe="handleSwipe">
  <text class="title">
    Selected: {{time}}
  </text>
  <picker-view class="time-picker" type="time" selected="{{defaultTime}}" @change="handleChange"></picker-view>
</div>

/* xxx.css */
.container {
  flex-direction: column;
  justify-content: center;
  align-items: center;
  left: 0px;
  top: 0px;
  width: 454px;
  height: 454px;
}
.title {
  font-size: 30px;
  text-align: center;
}
.time-picker {
  width: 500px;
  height: 400px;
  margin-top: 20px;
}

/* xxx.js */
export default {
  data: {
    defaultTime: "",
    time: "",
  },
  onInit() {
    this.defaultTime = this.now();
  },
  handleChange(data) {
    this.time = this.concat(data.hour, data.minute);
  },
  now() {
    const date = new Date();
    const hours = date.getHours();
    const minutes = date.getMinutes();
    return this.concat(hours, minutes);
  },

  fill(value) {
    return (value > 9 ? "" : "0") + value;
  },

  concat(hours, minutes) {
    return `${this.fill(hours)}:${this.fill(minutes)}`;
  },
}

picker-view