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+<template>
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+ <view class="u-textarea" :class="textareaClass" :style="[textareaStyle]">
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+ <textarea
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+ class="u-textarea__field"
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+ :value="innerValue"
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+ :style="{ height: $u.addUnit(height) }"
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+ :placeholder="placeholder"
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+ :placeholder-style="$u.addStyle(placeholderStyle, 'string')"
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+ :placeholder-class="placeholderClass"
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+ :disabled="disabled"
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+ :focus="focus"
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+ :autoHeight="autoHeight"
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+ :fixed="fixed"
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+ :cursorSpacing="cursorSpacing"
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+ :cursor="cursor"
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+ :showConfirmBar="showConfirmBar"
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+ :selectionStart="selectionStart"
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+ :selectionEnd="selectionEnd"
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+ :adjustPosition="adjustPosition"
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+ :disableDefaultPadding="disableDefaultPadding"
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+ :holdKeyboard="holdKeyboard"
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+ :maxlength="maxlength"
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+ :confirmType="confirmType"
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+ :ignoreCompositionEvent="ignoreCompositionEvent"
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+ @focus="onFocus"
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+ @blur="onBlur"
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+ @linechange="onLinechange"
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+ @input="onInput"
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+ @confirm="onConfirm"
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+ @keyboardheightchange="onKeyboardheightchange"
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+ ></textarea>
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+ <text
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+ class="u-textarea__count"
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+ :style="{
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+ 'background-color': disabled ? 'transparent' : '#fff',
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+ }"
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+ v-if="count"
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+ >{{ innerValue.length }}/{{ maxlength }}</text
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+ >
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+ </view>
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+</template>
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+
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+<script>
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+import props from "./props.js";
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+/**
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+ * Textarea 文本域
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+ * @description 文本域此组件满足了可能出现的表单信息补充,编辑等实际逻辑的功能,内置了字数校验等
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+ * @tutorial https://www.uviewui.com/components/textarea.html
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+ *
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+ * @property {String | Number} value 输入框的内容
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+ * @property {String | Number} placeholder 输入框为空时占位符
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+ * @property {String} placeholderClass 指定placeholder的样式类,注意页面或组件的style中写了scoped时,需要在类名前写/deep/ ( 默认 'input-placeholder' )
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+ * @property {String | Object} placeholderStyle 指定placeholder的样式,字符串/对象形式,如"color: red;"
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+ * @property {String | Number} height 输入框高度(默认 70 )
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+ * @property {String} confirmType 设置键盘右下角按钮的文字,仅微信小程序,App-vue和H5有效(默认 'done' )
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+ * @property {Boolean} disabled 是否禁用(默认 false )
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+ * @property {Boolean} count 是否显示统计字数(默认 false )
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+ * @property {Boolean} focus 是否自动获取焦点,nvue不支持,H5取决于浏览器的实现(默认 false )
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+ * @property {Boolean | Function} autoHeight 是否自动增加高度(默认 false )
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+ * @property {Boolean} fixed 如果textarea是在一个position:fixed的区域,需要显示指定属性fixed为true(默认 false )
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+ * @property {Number} cursorSpacing 指定光标与键盘的距离(默认 0 )
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+ * @property {String | Number} cursor 指定focus时的光标位置
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+ * @property {Function} formatter 内容式化函数
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+ * @property {Boolean} showConfirmBar 是否显示键盘上方带有”完成“按钮那一栏,(默认 true )
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+ * @property {Number} selectionStart 光标起始位置,自动聚焦时有效,需与selection-end搭配使用,(默认 -1 )
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+ * @property {Number | Number} selectionEnd 光标结束位置,自动聚焦时有效,需与selection-start搭配使用(默认 -1 )
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+ * @property {Boolean} adjustPosition 键盘弹起时,是否自动上推页面(默认 true )
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+ * @property {Boolean | Number} disableDefaultPadding 是否去掉 iOS 下的默认内边距,只微信小程序有效(默认 false )
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+ * @property {Boolean} holdKeyboard focus时,点击页面的时候不收起键盘,只微信小程序有效(默认 false )
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+ * @property {String | Number} maxlength 最大输入长度,设置为 -1 的时候不限制最大长度(默认 140 )
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+ * @property {String} border 边框类型,surround-四周边框,none-无边框,bottom-底部边框(默认 'surround' )
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+ * @property {Boolean} ignoreCompositionEvent 是否忽略组件内对文本合成系统事件的处理
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+ *
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+ * @event {Function(e)} focus 输入框聚焦时触发,event.detail = { value, height },height 为键盘高度
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+ * @event {Function(e)} blur 输入框失去焦点时触发,event.detail = {value, cursor}
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+ * @event {Function(e)} linechange 输入框行数变化时调用,event.detail = {height: 0, heightRpx: 0, lineCount: 0}
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+ * @event {Function(e)} input 当键盘输入时,触发 input 事件
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+ * @event {Function(e)} confirm 点击完成时, 触发 confirm 事件
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+ * @event {Function(e)} keyboardheightchange 键盘高度发生变化的时候触发此事件
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+ * @example <u--textarea v-model="value1" placeholder="请输入内容" ></u--textarea>
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+ */
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+export default {
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+ name: "u-textarea",
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+ mixins: [uni.$u.mpMixin, uni.$u.mixin, props],
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+ data() {
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+ return {
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+ // 输入框的值
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+ innerValue: "",
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+ // 是否处于获得焦点状态
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+ focused: false,
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+ // value是否第一次变化,在watch中,由于加入immediate属性,会在第一次触发,此时不应该认为value发生了变化
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+ firstChange: true,
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+ // value绑定值的变化是由内部还是外部引起的
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+ changeFromInner: false,
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+ // 过滤处理方法
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+ innerFormatter: value => value
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+ }
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+ },
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+ watch: {
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+ value: {
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+ immediate: true,
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+ handler(newVal, oldVal) {
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+ this.innerValue = newVal;
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+ /* #ifdef H5 */
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+ // 在H5中,外部value变化后,修改input中的值,不会触发@input事件,此时手动调用值变化方法
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+ if (
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+ this.firstChange === false &&
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+ this.changeFromInner === false
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+ ) {
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+ this.valueChange();
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+ }
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+ /* #endif */
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+ this.firstChange = false;
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+ // 重置changeFromInner的值为false,标识下一次引起默认为外部引起的
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+ this.changeFromInner = false;
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+ },
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+ },
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+ },
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+ computed: {
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+ // 组件的类名
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+ textareaClass() {
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+ let classes = [],
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+ { border, disabled, shape } = this;
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+ border === "surround" &&
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+ (classes = classes.concat(["u-border", "u-textarea--radius"]));
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+ border === "bottom" &&
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+ (classes = classes.concat([
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+ "u-border-bottom",
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+ "u-textarea--no-radius",
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+ ]));
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+ disabled && classes.push("u-textarea--disabled");
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+ return classes.join(" ");
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+ },
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+ // 组件的样式
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+ textareaStyle() {
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+ const style = {};
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+ // #ifdef APP-NVUE
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+ // 由于textarea在安卓nvue上的差异性,需要额外再调整其内边距
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+ if (uni.$u.os() === "android") {
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+ style.paddingTop = "6px";
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+ style.paddingLeft = "9px";
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+ style.paddingBottom = "3px";
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+ style.paddingRight = "6px";
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+ }
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+ // #endif
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+ return uni.$u.deepMerge(style, uni.$u.addStyle(this.customStyle));
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+ },
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+ },
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+ methods: {
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+ // 在微信小程序中,不支持将函数当做props参数,故只能通过ref形式调用
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+ setFormatter(e) {
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+ this.innerFormatter = e
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+ },
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+ onFocus(e) {
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+ this.$emit("focus", e);
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+ },
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+ onBlur(e) {
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+ this.$emit("blur", e);
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+ // 尝试调用u-form的验证方法
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+ uni.$u.formValidate(this, "blur");
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+ },
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+ onLinechange(e) {
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+ this.$emit("linechange", e);
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+ },
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+ onInput(e) {
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+ let { value = "" } = e.detail || {};
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+ // 格式化过滤方法
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+ const formatter = this.formatter || this.innerFormatter
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+ const formatValue = formatter(value)
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+ // 为了避免props的单向数据流特性,需要先将innerValue值设置为当前值,再在$nextTick中重新赋予设置后的值才有效
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+ this.innerValue = value
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+ this.$nextTick(() => {
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+ this.innerValue = formatValue;
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+ this.valueChange();
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+ })
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+ },
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+ // 内容发生变化,进行处理
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+ valueChange() {
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+ const value = this.innerValue;
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+ this.$nextTick(() => {
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+ this.$emit("input", value);
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+ // 标识value值的变化是由内部引起的
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+ this.changeFromInner = true;
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+ this.$emit("change", value);
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+ // 尝试调用u-form的验证方法
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+ uni.$u.formValidate(this, "change");
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+ });
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+ },
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+ onConfirm(e) {
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+ this.$emit("confirm", e);
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+ },
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+ onKeyboardheightchange(e) {
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+ this.$emit("keyboardheightchange", e);
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+ },
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+ },
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+};
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+</script>
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+
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+<style lang="scss" scoped>
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+@import "../../libs/css/style.components.scss";
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+
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+.u-textarea {
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+ border-radius: 4px;
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+ background-color: #fff;
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+ position: relative;
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+ display: flex;
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+ flex: 1;
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+ padding: 9px;
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+
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+ &--radius {
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+ border-radius: 4px;
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+ }
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+
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+ &--no-radius {
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+ border-radius: 0;
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+ }
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+
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+ &--disabled {
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+ background-color: #f5f7fa;
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+ }
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+
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+ &__field {
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+ flex: 1;
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+ font-size: 15px;
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+ color: $u-content-color;
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+ width: 100%;
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+ }
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+
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+ &__count {
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+ position: absolute;
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+ right: 5px;
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+ bottom: 2px;
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+ font-size: 12px;
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+ color: $u-tips-color;
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+ background-color: #ffffff;
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+ padding: 1px 4px;
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+ }
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+}
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+</style>
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