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240 lines
9.4 KiB
240 lines
9.4 KiB
2 years ago
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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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<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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<style lang="scss" scoped>
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@import "../../libs/css/components.scss";
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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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@include flex;
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flex: 1;
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padding: 9px;
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&--radius {
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border-radius: 4px;
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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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&--disabled {
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background-color: #f5f7fa;
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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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&__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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