| <template> | |
|     <view class="u-textarea" :class="textareaClass" :style="[textareaStyle]"> | |
|         <textarea | |
|             class="u-textarea__field" | |
|             :value="innerValue" | |
|             :style="{ height: $u.addUnit(height) }" | |
|             :placeholder="placeholder" | |
|             :placeholder-style="$u.addStyle(placeholderStyle, 'string')" | |
|             :placeholder-class="placeholderClass" | |
|             :disabled="disabled" | |
|             :focus="focus" | |
|             :autoHeight="autoHeight" | |
|             :fixed="fixed" | |
|             :cursorSpacing="cursorSpacing" | |
|             :cursor="cursor" | |
|             :showConfirmBar="showConfirmBar" | |
|             :selectionStart="selectionStart" | |
|             :selectionEnd="selectionEnd" | |
|             :adjustPosition="adjustPosition" | |
|             :disableDefaultPadding="disableDefaultPadding" | |
|             :holdKeyboard="holdKeyboard" | |
|             :maxlength="maxlength" | |
|             :confirmType="confirmType" | |
|             :ignoreCompositionEvent="ignoreCompositionEvent" | |
|             @focus="onFocus" | |
|             @blur="onBlur" | |
|             @linechange="onLinechange" | |
|             @input="onInput" | |
|             @confirm="onConfirm" | |
|             @keyboardheightchange="onKeyboardheightchange" | |
|         ></textarea> | |
|         <text | |
|             class="u-textarea__count" | |
|             v-if="count" | |
|             >{{ innerValue.length }}/{{ maxlength }}</text | |
|         > | |
|     </view> | |
| </template> | |
| 
 | |
| <script> | |
| import props from "./props.js"; | |
| /** | |
|  * Textarea 文本域 | |
|  * @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 | |
|  * @tutorial https://www.uviewui.com/components/textarea.html | |
|  * | |
|  * @property {String | Number} 		value					输入框的内容 | |
|  * @property {String | Number}		placeholder				输入框为空时占位符 | |
|  * @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' ) | |
|  * @property {String | Object}	    placeholderStyle		指定placeholder的样式,字符串/对象形式,如"color: red;" | |
|  * @property {String | Number}		height					输入框高度(默认 70 ) | |
|  * @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' ) | |
|  * @property {Boolean}				disabled				是否禁用(默认 false ) | |
|  * @property {Boolean}				count					是否显示统计字数(默认 false ) | |
|  * @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 ) | |
|  * @property {Boolean | Function}	autoHeight				是否自动增加高度(默认 false ) | |
|  * @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 ) | |
|  * @property {Number}				cursorSpacing			指定光标与键盘的距离(默认 0 ) | |
|  * @property {String | Number}		cursor					指定focus时的光标位置 | |
|  * @property {Function}			    formatter			    内容式化函数 | |
|  * @property {Boolean}				showConfirmBar			是否显示键盘上方带有”完成“按钮那一栏,(默认 true ) | |
|  * @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 ) | |
|  * @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 ) | |
|  * @property {Boolean}				adjustPosition			键盘弹起时,是否自动上推页面(默认 true ) | |
|  * @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 ) | |
|  * @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 ) | |
|  * @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 ) | |
|  * @property {String}				border					边框类型,surround-四周边框,none-无边框,bottom-底部边框(默认 'surround' ) | |
|  * @property {Boolean}				ignoreCompositionEvent	是否忽略组件内对文本合成系统事件的处理 | |
|  * | |
|  * @event {Function(e)} focus					输入框聚焦时触发,event.detail = { value, height },height 为键盘高度 | |
|  * @event {Function(e)} blur					输入框失去焦点时触发,event.detail = {value, cursor} | |
|  * @event {Function(e)} linechange				输入框行数变化时调用,event.detail = {height: 0, heightRpx: 0, lineCount: 0} | |
|  * @event {Function(e)} input					当键盘输入时,触发 input 事件 | |
|  * @event {Function(e)} confirm					点击完成时, 触发 confirm 事件 | |
|  * @event {Function(e)} keyboardheightchange	键盘高度发生变化的时候触发此事件 | |
|  * @example <u--textarea v-model="value1" placeholder="请输入内容" ></u--textarea> | |
|  */ | |
| export default { | |
|     name: "u-textarea", | |
|     mixins: [uni.$u.mpMixin, uni.$u.mixin, props], | |
| 	data() { | |
| 		return { | |
| 			// 输入框的值 | |
| 			innerValue: "", | |
| 			// 是否处于获得焦点状态 | |
| 			focused: false, | |
| 			// 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 | |
| 			firstChange: true, | |
| 			// value绑定值的变化是由内部还是外部引起的 | |
| 			changeFromInner: false, | |
| 			// 过滤处理方法 | |
| 			innerFormatter: value => value | |
| 		} | |
| 	}, | |
| 	watch: { | |
| 	    value: { | |
| 	        immediate: true, | |
| 	        handler(newVal, oldVal) { | |
| 	            this.innerValue = newVal; | |
| 	            /* #ifdef H5 */ | |
| 	            // 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 | |
| 	            if ( | |
| 	                this.firstChange === false && | |
| 	                this.changeFromInner === false | |
| 	            ) { | |
| 	                this.valueChange(); | |
| 	            } | |
| 	            /* #endif */ | |
| 	            this.firstChange = false; | |
| 	            // 重置changeFromInner的值为false,标识下一次引起默认为外部引起的 | |
| 	            this.changeFromInner = false; | |
| 	        }, | |
| 	    }, | |
| 	}, | |
|     computed: { | |
|         // 组件的类名 | |
|         textareaClass() { | |
|             let classes = [], | |
|                 { border, disabled, shape } = this; | |
|             border === "surround" && | |
|                 (classes = classes.concat(["u-border", "u-textarea--radius"])); | |
|             border === "bottom" && | |
|                 (classes = classes.concat([ | |
|                     "u-border-bottom", | |
|                     "u-textarea--no-radius", | |
|                 ])); | |
|             disabled && classes.push("u-textarea--disabled"); | |
|             return classes.join(" "); | |
|         }, | |
|         // 组件的样式 | |
|         textareaStyle() { | |
|             const style = {}; | |
|             // #ifdef APP-NVUE | |
|             // 由于textarea在安卓nvue上的差异性,需要额外再调整其内边距 | |
|             if (uni.$u.os() === "android") { | |
|                 style.paddingTop = "6px"; | |
|                 style.paddingLeft = "9px"; | |
|                 style.paddingBottom = "3px"; | |
|                 style.paddingRight = "6px"; | |
|             } | |
|             // #endif | |
|             return uni.$u.deepMerge(style, uni.$u.addStyle(this.customStyle)); | |
|         }, | |
|     }, | |
|     methods: { | |
| 		// 在微信小程序中,不支持将函数当做props参数,故只能通过ref形式调用 | |
| 		setFormatter(e) { | |
| 			this.innerFormatter = e | |
| 		}, | |
|         onFocus(e) { | |
|             this.$emit("focus", e); | |
|         }, | |
|         onBlur(e) { | |
|             this.$emit("blur", e); | |
|             // 尝试调用u-form的验证方法 | |
|             uni.$u.formValidate(this, "blur"); | |
|         }, | |
|         onLinechange(e) { | |
|             this.$emit("linechange", e); | |
|         }, | |
|         onInput(e) { | |
| 			let { value = "" } = e.detail || {}; | |
| 			// 格式化过滤方法 | |
| 			const formatter = this.formatter || this.innerFormatter | |
| 			const formatValue = formatter(value) | |
| 			// 为了避免props的单向数据流特性,需要先将innerValue值设置为当前值,再在$nextTick中重新赋予设置后的值才有效 | |
| 			this.innerValue = value | |
| 			this.$nextTick(() => { | |
| 				this.innerValue = formatValue; | |
| 				this.valueChange(); | |
| 			}) | |
|         }, | |
| 		// 内容发生变化,进行处理 | |
| 		valueChange() { | |
| 		    const value = this.innerValue; | |
| 		    this.$nextTick(() => { | |
| 		        this.$emit("input", value); | |
| 		        // 标识value值的变化是由内部引起的 | |
| 		        this.changeFromInner = true; | |
| 		        this.$emit("change", value); | |
| 		        // 尝试调用u-form的验证方法 | |
| 		        uni.$u.formValidate(this, "change"); | |
| 		    }); | |
| 		}, | |
|         onConfirm(e) { | |
|             this.$emit("confirm", e); | |
|         }, | |
|         onKeyboardheightchange(e) { | |
|             this.$emit("keyboardheightchange", e); | |
|         }, | |
|     }, | |
| }; | |
| </script> | |
| 
 | |
| <style lang="scss" scoped> | |
| @import "../../libs/css/components.scss"; | |
| 
 | |
| .u-textarea { | |
|     border-radius: 4px; | |
|     position: relative; | |
|     @include flex; | |
|     flex: 1; | |
| 	padding: 9px; | |
| 
 | |
|     &--radius { | |
|         border-radius: 4px; | |
|     } | |
| 
 | |
|     &--no-radius { | |
|         border-radius: 0; | |
|     } | |
| 
 | |
|     &--disabled { | |
|         background-color: #f5f7fa; | |
|     } | |
| 
 | |
|     &__field { | |
|         flex: 1; | |
|         font-size: 14px; | |
|         color: $u-content-color; | |
| 		width: 100%; | |
|     } | |
| 
 | |
|     &__count { | |
|         position: absolute; | |
|         right: 5px; | |
|         bottom: 2px; | |
|         font-size: 12px; | |
|         color: $u-tips-color; | |
|         padding: 1px 4px; | |
|     } | |
| } | |
| </style>
 |