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<docs>
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---
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order: 9
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title:
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zh-CN: 输入时格式化展示
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en-US: Format Tooltip Input
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---
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## zh-CN
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结合 [Tooltip](/components/tooltip-cn/) 组件，实现一个数值输入框，方便内容超长时的全量展现。
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## en-US
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You can use the Input in conjunction with [Tooltip](/components/tooltip/) component to create a Numeric Input, which can provide a good experience for extra-long content display.
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</docs>
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<template>
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<a-tooltip :trigger="['focus']" placement="topLeft" overlay-class-name="numeric-input">
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<template v-if="inputValue" #title>
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<span class="numeric-input-title">
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{{ formatValue }}
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</span>
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</template>
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<a-input
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v-model:value="inputValue"
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placeholder="Input a number"
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:max-length="25"
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style="width: 120px"
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@blur="onBlur"
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/>
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</a-tooltip>
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</template>
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<script lang="ts">
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import { computed, defineComponent, ref, watch } from 'vue';
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function formatNumber(value: string) {
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value += '';
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const list = value.split('.');
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const prefix = list[0].charAt(0) === '-' ? '-' : '';
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let num = prefix ? list[0].slice(1) : list[0];
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let result = '';
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while (num.length > 3) {
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result = `,${num.slice(-3)}${result}`;
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num = num.slice(0, num.length - 3);
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}
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if (num) {
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result = num + result;
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}
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return `${prefix}${result}${list[1] ? `.${list[1]}` : ''}`;
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}
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export default defineComponent({
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setup() {
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const inputValue = ref<string>('111');
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const formatValue = computed(() => {
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if (inputValue.value === '-') return '-';
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return formatNumber(inputValue.value);
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});
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const format = (val: string, preVal: string) => {
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const reg = /^-?\d*(\.\d*)?$/;
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if ((!isNaN(+val) && reg.test(val)) || val === '' || val === '-') {
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inputValue.value = val;
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} else {
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inputValue.value = preVal;
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}
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};
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// '.' at the end or only '-' in the input box.
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const onBlur = () => {
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if (
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inputValue.value.charAt(inputValue.value.length - 1) === '.' ||
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inputValue.value === '-'
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) {
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format(inputValue.value.slice(0, -1), inputValue.value);
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}
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};
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watch(inputValue, (val, preVal) => {
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format(val, preVal);
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});
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return {
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inputValue,
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onBlur,
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formatValue,
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};
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},
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});
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</script>
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<style>
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/* to prevent the arrow overflow the popup container,
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or the height is not enough when content is empty */
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.numeric-input .ant-tooltip-inner {
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min-width: 32px;
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min-height: 37px;
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}
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.numeric-input .numeric-input-title {
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font-size: 14px;
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}
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</style>
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