harmony 鸿蒙picker

2022-08-09
浏览 (698)

picker

NOTE

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

The <picker> component supports common, date, time, data and time, and multi-column text selectors.

Required Permissions

None

Child Components

Not supported

Attributes

In addition to the universal attributes, the following attributes are supported.

Name	Type	Default Value	Mandatory	Description
type	string	-	No	Picker type. Dynamic modification is not supported. The options are as follows: - text: text selector. - date: date selector. - time: time selector. - datetime: date and time selector. - multi-text: multi-column text selector.

Common Selector

When type is set to text, a common selector is used.

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

Date Selector

When type is set to date, a date selector is used.

Name	Type	Default Value	Mandatory	Description
start	<time>	1970-1-1	No	Start date of the date selector, in the format of YYYY-MM-DD.
end	<time>	2100-12-31	No	End date of the date selector, in the format of YYYY-MM-DD.
selected	string	Current date	No	Default value of the date selector, in format of YYYY-MM-DD.
value	string	-	Yes	Value of the date selector.
lunar⁵⁺	boolean	false	No	Whether the pop-up window displays the lunar calendar.
lunarswitch	boolean	false	No	Whether the date selector displays the lunar calendar switch, which is used to switch between the Gregorian calendar and lunar calendar. The value true means to display the lunar calendar switch for users to switch between the Gregorian calendar and lunar calendar. The value false means not to display the lunar calendar switch. When both lunarswitch and lunar are set to true, the switch is selected.

Time Selector

When type is set to time, a time selector is used.

Name	Type	Default Value	Mandatory	Description
containsecond	boolean	false	No	Whether seconds are contained.
selected	string	Current time	No	Default value of the time selector, in format of HH:mm. If seconds are contained, the format is HH:mm:ss.
value	string	-	No	Value of the time selector.
hours	number	24^1-4 -⁵⁺	No	Time format used by the time selector. Available values are as follows: - 12: displayed in 12-hour format and distinguished by a.m. and p.m. - 24: displayed in 24-hour format. Since API version 5, the default value is the most commonly-used hour format in the current locale.

Date and Time Selector

When type is set to datetime, a date and time selector is used.

Name	Type	Default Value	Mandatory	Description
selected	string	Current date and time	No	Default value of the date and time selector. The value can be in either of the following formats: - MM-DD-HH-mm - YYYY-MM-DD-HH-mm If the year is not set, the current year is used by default. The value you set is the date selected by default in the pop-up window.
value	string	-	Yes	Value of the date and time selector.
hours	number	24^1-4 -⁵⁺	No	Time format used by the date and time selector. Available values are as follows: - 12: displayed in 12-hour format and distinguished by a.m. and p.m. - 24: displayed in 24-hour format. Since API version 5, the default value is the most commonly-used hour format in the current locale.
lunar⁵⁺	boolean	false	No	Whether the pop-up window displays the lunar calendar.
lunarswitch	boolean	false	No	Whether the date selector displays the lunar calendar switch, which is used to switch between the Gregorian calendar and lunar calendar. The value true means to display the lunar calendar switch for users to switch between the Gregorian calendar and lunar calendar. The value false means not to display the lunar calendar switch. When both lunarswitch and lunar are set to true, the switch is selected.

Multi-Column Text Selector

When type is set to multi-text, a multi-column text selector is used.

Name	Type	Default Value	Mandatory	Description
columns	number	-	Yes	Number of columns in the multi-column text selector.
range	Two-dimensional array	-	No	Items of the multi-column text selector. range is a two-dimensional array that indicates the number of columns. Each item in the array indicates the data of each column, for example, [[“a”, “b”], [“c”, “d”]]. Use the data binding mode, for example, `range = {{data}}`. Declare the corresponding variable `data: ["15", "20", "25"]` in JavaScript.
selected	Array	[0,0,0, …]	No	Default value of the multi-column text selector, which is an array consisting of the indexes of the selected items in each column.
value	Array	-	No	Value of the multi-column text selector, which is an array consisting of the values of the selected items in each column.

Styles

In addition to the universal styles, the following styles are supported.

Name	Type	Default Value	Mandatory	Description
text-color	<color>	-	No	Text color of the selector.
font-size	<length>	-	No	Font size of the selector.
allow-scale	boolean	true	No	Whether the font size changes with the system’s font size settings. If the config-changes tag of fontSize is configured for abilities in the config.json file, the setting takes effect without application restart.
letter-spacing	<length>	0	No	Letter spacing of the selector. For details, see letter-spacing in the <text> component.
text-decoration	string	-	No	Text decoration of the selector. For details, see text-decoration in the <text> component.
font-style	string	normal	No	Font style of the selector. For details, see font-style in the <text> component.
font-weight	number \|string	normal	No	Font weight of the selector. For details, see font-weight in the <text> component.
font-family	string	sans-serif	No	Font family, in which fonts are separated by commas (,). Each font is set using a font name or font family name. The first font in the family or the specified custom font is used for the text.
line-height	<length>	0px	No	Text line height of the selector.
column-height⁵⁺	<length>	-	No	Height of the selector option list.

Events

In addition to the universal events, the following events are supported.

Common Selector

Name	Parameter	Description
change	{ newValue: newValue, newSelected: newSelected }	Triggered when an item is selected and the OK button is clicked in the displayed pop-up window. newSelected is the index.
cancel	-	Triggered when the cancel button is clicked.

Date Selector

Name	Parameter	Description
change	{ year: year, month: month, day: day }	Triggered when an item is selected and the OK button is clicked in the displayed pop-up window. The value of month ranges from 0 (January) to 11 (December) since API version 5.
cancel	-	Triggered when the cancel button is clicked.

Date and Time Selector

Name	Parameter	Description
change	{ year: year, month: month, day: day, hour: hour, minute: minute}	Triggered when an item is selected and the OK button is clicked in the displayed pop-up window.
cancel	-	Triggered when the cancel button is clicked.

Time Selector

Name	Parameter	Description
change	{ hour: hour, minute: minute, [second: second] }	Triggered when an item is selected and the OK button is clicked in the displayed pop-up window. If containsecond is set to true, value contains seconds.
cancel	-	Triggered when the cancel button is clicked.

Multi-Column Text Selector

Name	Parameter	Description
change	{ newValue: [newValue1, newValue2, newValue3, …], newSelected:[newSelected1, newSelected2, newSelected3, …] }	Triggered when an item is selected and the OK button is clicked in the displayed pop-up window. - newValue is an array consisting of the values of the selected items. - newSelected is an array consisting of the indexes of the selected items. The lengths of newValue and newSelected are the same as the length of range.
columnchange	{ column: column, newValue: newValue, newSelected: newSelected }	Triggered when the value of a column in the multi-column selector changes. - column: column whose value has changed. - newValue: selected value. - newSelected: index of the selected value.
cancel	-	Triggered when the cancel button is clicked.

Methods

In addition to the universal methods, the following methods are supported.

Name	Parameter	Description
show	-	Shows the picker.

Example

<!-- xxx.hml -->
<div class="container">
    <select @change="selectChange">
        <option value="{{ item }}" for="item in selectList">
            {{ item }}
        </option>
    </select>
    <picker id="picker0" type="text" value="{{ textvalue }}" selected="{{ textselect }}" range="{{ rangetext }}"
            onchange="textonchange"
            oncancel="textoncancel" class="pickertext" show="false"></picker>

    <picker id="picker1" type="date" value="{{ datevalue }}" start="2002-2-5" end="2030-6-5" selected="{{ dateselect }}"
            lunarswitch="true"
            onchange="dateonchange" oncancel="dateoncancel" class="pickerdate" show="false"></picker>

    <picker id="picker2" type="time" value="{{ timevalue }}" containsecond="{{ containsecond }}"
            selected="{{ timeselect }}" hours="12"
            onchange="timeonchange" oncancel="timeoncancel" class="pickertime" show="false"></picker>

    <picker id="picker3" type="datetime" value="{{ datetimevalue }}" selected="{{ datetimeselect }}" hours="24"
            lunarswitch="true"
            onchange="datetimeonchange" oncancel="datetimeoncancel" class="pickerdatetime" show="false"></picker>

    <picker id="picker4" type="multi-text" value="{{ multitextvalue }}" columns="3" range="{{ multitext }}"
            selected="{{ multitextselect }}"
            onchange="multitextonchange" oncancel="multitextoncancel" class="pickermuitl" show="false"></picker>
</div>

/* xxx.css */
.container {
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

picker {
    width: 60%;
    height: 80px;
    border-radius: 20px;
    text-color: white;
    font-size: 15px;
    background-color: #4747e3;
    margin-left: 20%;
}

select {
    background-color: #efecec;
    height: 50px;
    width: 60%;
    margin-left: 20%;
    margin-top: 300px;
    margin-bottom: 50px;
    font-size: 22px;
}

// xxx.js
import promptAction from '@ohos.promptAction';

export default {
    data: {
        selectList: ["text", "data", "time", "datetime", "multitext"],
        rangetext: ['15', "20", "25"],
        multitext: [["a", "b", "c"], ["e", "f", "g"], ["h", "i"], ["k", "l", "m"]],
        textvalue: 'default textvalue',
        datevalue: 'default datevalue',
        timevalue: 'default timevalue',
        datetimevalue: 'default datetimevalue',
        multitextvalue: 'default multitextvalue',
        containsecond: true,
        multitextselect: [1, 2, 0],
        datetimeselect: '2012-5-6-11-25',
        timeselect: '11:22:30',
        dateselect: '2021-3-2',
        textselect: '2'
    },
    selectChange(e) {
        for (let i = 0;i < this.selectList.length; i++) {
            if (e.newValue == this.selectList[i]) {
                this.$element("picker" + i).show();
            }
        }
    },
    textonchange(e) {
        this.textvalue = e.newValue;
        promptAction.showToast({
            message: "text:" + e.newValue + ",newSelected:" + e.newSelected
        })
    },
    textoncancel(e) {
        promptAction.showToast({
            message: "text: textoncancel"
        })
    },
    dateonchange(e) {
        this.datevalue = e.year + "-" + e.month + "-" + e.day;
        promptAction.showToast({
            message: "date:" + e.year + "-" + (e.month + 1) + "-" + e.day
        })
    },
    dateoncancel() {
        promptAction.showToast({
            message: "date: dateoncancel"
        })
    },
    timeonchange(e) {
        if (this.containsecond) {
            this.timevalue = e.hour + ":" + e.minute + ":" + e.second;
            promptAction.showToast({
                message: "Time:" + e.hour + ":" + e.minute + ":" + e.second
            })
        } else {
            this.timevalue = e.hour + ":" + e.minute;
            promptAction.showToast({
                message: "Time:" + e.hour + ":" + e.minute
            })
        }
    },
    timeoncancel() {
        promptAction.showToast({
            message: "timeoncancel"
        })
    },
    datetimeonchange(e) {
        this.datetimevalue = e.year + "-" + e.month + "-" + e.day + " " + e.hour + ":" + e.minute;
        promptAction.showToast({
            message: "Time:" + (e.month + 1) + "-" + e.day + " " + e.hour + ":" + e.minute
        })
    },
    datetimeoncancel() {
        promptAction.showToast({
            message: "datetimeoncancel"
        })
    },
    multitextonchange(e) {
        this.multitextvalue = e.newValue;
        promptAction.showToast({
            message: "Multi-column text change" + e.newValue
        })
    },
    multitextoncancel() {
        promptAction.showToast({
            message: "multitextoncancel"
        })
    },
    popup_picker() {
        this.$element("picker_text").show();
    },
}

mmmm