harmony 鸿蒙Universal Attributes

2022-08-09
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Universal Attributes

NOTE

Universal attributes are supported since API version 4. Updates will be marked with a superscript to indicate their earliest API version.

Common Attributes

Common attributes are used to set component identities and appearance.

Name	Type	Default Value	Mandatory	Description
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 or child components, which is registered with the parent component on `$refs`.
disabled	boolean	false	No	Whether the component is disabled. If it is disabled, it cannot respond to user interaction.
data	string	-	No	Attribute set for the component to facilitate data storage and reading. In the JS file: - Use e.target.attr.data to read data in the event callback, where e is the input parameter. - Use `$element` or `$refs` to obtain a DOM element, which can then be accessed through attr.data. You are advised to use data-* instead since API version 6.
data-*⁶⁺	string	-	No	Attribute set for the component to facilitate data storage and reading. The value is case insensitive. For example, data-A and data-a are the same by default. In the JS file: - Use e.target.dataSet.a to read data in the event callback, where e is the input parameter. - After a DOM element is obtained by using $element or $refs, it can be accessed through dataSet.a.
click-effect⁵⁺	string	-	No	Click effect complying with spring physics. Available values are as follows: - spring-small: The component scales down to 90% of its size when it is selected. This is appropriate for small components. - spring-medium: The component scales down to 95% of its size when it is selected. This is appropriate for medium-sized components. - spring-large: The component scales down to 95% of its size when it is selected. This is appropriate for large components.
dir⁶⁺	string	auto	No	Element layout mode. Available values are as follows: - rtl: right-to-left layout. - ltr: left-to-right layout. - auto: follows the system language environment.

Rendering Attributes

Rendering attributes are used to set whether a component is rendered.

Name	Type	Default Value	Description
for	Array	-	Expands the current element based on the configured data list.
if	boolean	-	Whether the element is added or removed.
show	boolean	-	Whether the element is displayed or hidden.

NOTE

Do not set styles in attribute fields.

Example

Example 1

<!-- xxx.hml -->
<div id="container">
    <button class="btn" type="capsule" value="toggleDisplay" onclick="toggleDisplay"></button>
	<list class="list">
		<list-item for="{{ array }}" class="listItem">
			<text class="text" onclick="toggleShow" show="{{ visible }}"
                  if="{{ display }}">{{ $item.value }}</text>
		</list-item>
	</list>
</div>

/* xxx.css */
#container {
    flex-direction: column;
    width: 100%;
    margin-top: 10px;
}
.text {
    font-size: 50px;
    font-weight: 500;
    margin-left: 12px;
}
.listItem {
    width: 100%;
    height: 100px;
    line-height: 60px;
    border-bottom: 1px solid #DEDEDE;
    font-size: 20px;
}
.btn{
    width: 280px;
    font-size: 26px;
    margin: 10px 0;
}

// xxx.js
export default {
	data: {
        visible: true,
        display: true,
        title: "",
        i: 4,
        array: [
            {"value": "Item 0"},
            {"value": "Item 1"},
            {"value": "Item 2"},
            {"value": "Item 3"},
        ],
    },
    toggleShow: function() {
        this.array.push ({"value": "Item" + this.i })
        this.i++
    },
    toggleDisplay: function() {
        this.display = !this.display
    },
}

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Example 2

<!-- xxx.hml -->
<div class="container">
    <div>
        <text class="text1" dir='rtl' >hello world</text>
    </div>
    <div>
        <text class="text2" dir='ltr' >hello world</text>
    </div>
</div>

/* xxx.css */
.container {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 100%;
}
.text1{
    width: 90%;
    height: 100px;
    background-color: aqua;
}
.text2{
    width: 90%;
    height: 100px;
    background-color: blue;
}

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