SelectorQuery.select

解释： 在当前页面下选择第一个匹配选择器 selector 的节点，返回一个 NodesRef 对象实例，可以用于获取节点信息。

方法参数

String selector

返回值

NodesRefselector 类似于 CSS 的选择器，但仅支持下列语法。

1. ID 选择器：#the-id
2. class 选择器（可以连续指定多个）：.a-class.another-class
3. 子元素选择器：.the-parent > .the-child
4. 后代选择器：.the-ancestor .the-descendant
5. 多选择器的并集：#a-node, .some-other-nodes

示例

图片示例

代码示例 1 

在开发者工具中打开

<view class="wrap">
    <view class="card-area">
        <movable-area>
            <movable-view class="target" x="{{x}}" y="{{y}}" direction="all">
                Drag
            </movable-view>
        </movable-area>
        <button bindtap="queryNodeInfo">点击获取节点信息</button>
        <view class="list-area border-bottom">
            <text>Drag的节点信息高度为：</text>
            <text class="list-item-value-6">{{message}}</text>
        </view>
    </view>
</view>

Page({
    data: {
        message: ''
    },
    onReady() {
        this.selectorQuery = swan.createSelectorQuery();
    },
    queryNodeInfo() {
        console.log(this.selectorQuery.select('.target'));
        // nodeRef: selector: ".target", queryType: "select"
        this.selectorQuery
            .select('.target')
            .boundingClientRect()
            .exec(res => {
                console.log('节点信息：', res[0]);
                this.setData('message', res[0].top);
            });
    }
});

代码示例 2：id 选择器 

在开发者工具中打开

<view class="wrap">
    <view class="card-area">
        <movable-area>
            <movable-view id="target" x="{{x}}" y="{{y}}" direction="all">
                Drag
            </movable-view>
        </movable-area>
        <button bindtap="queryNodeInfo">点击获取节点信息</button>
        <view class="list-area border-bottom">
            <text>Drag的节点信息高度为：</text>
            <text class="list-item-value-6">{{message}}</text>
        </view>
    </view>
</view>

Page({
    data: { 
        message: ''
    },
    onReady() {
        this.selectorQuery = swan.createSelectorQuery();
    },
    queryNodeInfo() {
        console.log(this.selectorQuery.select('#target'));
        // nodeRef: selector: ".target", queryType: "select"
        this.selectorQuery
            .select('#target')
            .boundingClientRect()
            .exec(res => {
                console.log('节点信息：', res[0]);
                this.setData('message', res[0].top);
            });
    }
});

代码示例 3: 多个 class 选择器 

在开发者工具中打开

<view class="wrap">
    <view class="card-area">
        <movable-area>
            <movable-view class="target target2" x="{{x}}" y="{{y}}" direction="all">
                Drag
            </movable-view>
        </movable-area>
        <button bindtap="queryNodeInfo">点击获取节点信息</button>
        <view class="list-area border-bottom">
            <text>Drag的节点信息高度为：</text>
            <text class="list-item-value-6"> {{message}}</text>
        </view>
    </view>
</view>

Page({
    data: { 
        message: ''
    },
    onReady() {
        this.selectorQuery = swan.createSelectorQuery();
    },
    queryNodeInfo() {
        console.log(this.selectorQuery.select('.target.target2'));
        // nodeRef: selector: ".target", queryType: "select"
        this.selectorQuery.select('.target.target2').boundingClientRect();
        this.selectorQuery.exec(res => {
            this.setData('message', res[0].top);
        });
    }
});

代码示例 4: 子元素选择器 

在开发者工具中打开

<view class="wrap">
    <view class="card-area">
        <movable-area>
            <movable-view class="target" x="{{x}}" y="{{y}}" direction="all">
                <view class="block"> Drag</view>
            </movable-view>
        </movable-area>
        <button bindtap="queryNodeInfo">点击获取节点信息</button>
        <view class="list-area border-bottom">
            <text>Drag的节点信息高度为：</text>
            <text class="list-item-value-6"> {{message}}</text>
        </view>
    </view>
</view>

Page({
    data: { 
        message: ''
    },
    onReady() {
        this.selectorQuery = swan.createSelectorQuery();
    },
    queryNodeInfo() {
        console.log(this.selectorQuery.select('.target>.block'));
        // nodeRef: selector: ".target", queryType: "select"
        this.selectorQuery.select('.target>.block').boundingClientRect();
        this.selectorQuery.exec(res => {
            this.setData('message', res[0].top);
        });
    }
});