本文主要是介绍【文本输入框】显示输入文本的字数,并且限制输入字数不能超过***个字符,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
需求 实现一个输入框显示文本的字数,并且设置字数限制,当文本中没有内容或字符串长度超出限制,则不能点击确定按钮。
<div class="input-content"><div class="pt-2 rounded-tl-xl rounded-tr-xl bg-blue-100"><div class="px-4 pb-2 flex justify-between h-8 items-center"><span class="text-gray-800 font-semibold text-sm">请输入文本</span></div><div class="h-2 rounded-tl-xl rounded-tr-xl bg-white"></div></div><div class="px-4 pb-11"><textarea id="text-input" v-model="text" placeholder="请输入文本,建议使用简短的陈述句。" class="input-textarea"></textarea><div class="absolute inset-x-0 bottom-0 flex items-center justify-between mx-4 mt-2 mb-2"><div id="char-count" class="px-2.5 py-px text-xs leading-5 rounded-md inline-flex items-center flex-shrink-0 text-gray-800 bg-gray-100 !text-gray-500 opacity-50">0<span class="text-gray-300 mx-0.5">/</span>200</div><el-button size="medium" type="primary" :disabled="!canClick" :loading="testLoading" round @click="handleTest">确定</el-button></div></div>
</div>
computed: {canClick() {return this.text.length > 0 && this.text.length <= 200;},
}
data() {return {testLoading: false,text: '',}
}
mounted() {const textarea = document.getElementById('text-input');const charCount = document.getElementById('char-count');textarea.addEventListener('input', function () {const text = textarea.value;const count = text.length;charCount.textContent = count + '/200';if (count > 200) {textarea.value = text.slice(0, 200); // 截断输入文本,只保留前200个字符charCount.style.color = 'red'; // 如果超过200个字符,可以显示为红色提示} else {charCount.style.color = ''; // 恢复默认颜色}});
},
.input-content {position: relative;border-radius: 0.75rem;border-width: 1px;--tw-border-opacity: 1;border-color: rgb(28 100 242 / var(--tw-border-opacity));
}.input-textarea {height: 220px !important;width: 100% !important;resize: none !important;border-style: none !important;font-size: .875rem !important;line-height: 1.25rem !important;font-weight: 400 !important;--tw-text-opacity: 1 !important;color: rgb(55 65 81/ 1) !important;caret-color: #1c64f2 !important;outline: none;
}
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