使用JavaScript給textarea增加自適應高度功能

一、什麼是textarea自適應高度功能

是HTML表單中的一個文本輸入控制項，可以用於用戶輸入多行文本。但是，設置textarea的高度是一個問題，如果設置過高，會浪費頁面空間，如果設置過小，則不便於用戶輸入長文本。因此，我們需要一個自適應高度的textarea，它可以根據用戶輸入的內容，自動調整高度，以便更好地適應用戶輸入的內容。這就是textarea自適應高度的意義所在。</p><h3><span class=ez-toc-section id=25E425BA258C25E32580258125E525A6258225E425BD259525E525A2259E25E5258A25A0textarea25E8258725AA25E92580258225E525BA259425E925AB259825E525BA25A625E5258A259F25E8258325BD></span>二、如何增加textarea自適應高度功能<span class=ez-toc-section-end></span></h3><p>增加textarea自適應高度功能可以通過JavaScript代碼實現。以下是一個完整的實現代碼，我們逐行解釋各個步驟。</p><pre> // 獲取文本框對象 var textarea = document.getElementById('textarea'); // 指定文本框的最小高度 textarea.style.minHeight = '50px'; // 指定文本框的最大高度 textarea.style.maxHeight = '200px'; // 自適應高度的核心部分 function autoHeight(){ // 將文本框的高度設置為最小高度，以便重新計算高度 this.style.height = this.style.minHeight; // 計算文本框的實際高度 var height = this.scrollHeight; // 如果實際高度小於最小高度，則將文本框的高度設置為最小高度 if (height parseInt(this.style.maxHeight)){ this.style.height = this.style.maxHeight; } // 否則，將文本框的高度設置為實際高度 else{ this.style.height = height + 'px'; } } // 給文本框綁定自適應高度事件 textarea.addEventListener('input', autoHeight); // 頁面載入後，調用一次自適應高度函數，以便初始化文本框高度 autoHeight.call(textarea); </pre><h3><span class=ez-toc-section id=25E425B8258925E32580258125E425BB25A325E725A0258125E825A725A325E6259E2590></span>三、代碼解析<span class=ez-toc-section-end></span></h3><p>以上代碼中，最核心的部分是自適應高度的函數autoHeight()。以下是該函數的具體步驟。</p><ol> <li>將文本框的高度設置為最小高度，以便重新計算高度。</li> <li>計算文本框的實際高度。</li> <li>如果實際高度小於最小高度，則將文本框的高度設置為最小高度。</li> <li>如果實際高度大於最大高度，則將文本框的高度設置為最大高度。</li> <li>否則，將文本框的高度設置為實際高度。</li></ol><p>以上步驟保證了文本框的高度始終在指定的最小和最大高度之間，並隨著用戶輸入的內容自動調整高度。</p><h3><span class=ez-toc-section id=25E5259B259B25E32580258125E425BD25BF25E7259425A825E6258A258025E525B725A7></span>四、使用技巧<span class=ez-toc-section-end></span></h3><p>當我們使用textarea進行長文本的輸入時，自適應高度的功能非常有用。以下是一些使用該功能的技巧。</p><ol> <li>將文本框的最小高度設置為一行的高度，以免用戶輸入少量文本時浪費空間。</li> <li>將文本框的最大高度根據實際需求設定，避免用戶輸入過多文本時破壞頁面布局。</li></ol><p>總之，使用textarea自適應高度功能，可以提升用戶體驗，增加表單的易用性。</p><div class=entry-readmore><div 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