问题

我创建了一个textarea并调整其大小，以仅显示文本Title 1: value 1;。然后，我选择了textarea中的所有文本并将该文本拖出来。我注意到在拖动时文本的预览与调整textarea大小后可见的文本部分相同。换句话说，在拖动文本时，Chrome浏览器不显示整个文本，而只显示在textarea中可见的部分。

我想在textarea中仅显示文本value 1;。问题是调整textarea大小的按钮位于该元素的右下角。我想象如果该按钮也位于textarea的左上角，它仍然需要隐藏左侧的文本。

我还没有找到解决这个问题的方法。我也不知道是否有其他HTML元素可以替代textarea以仅显示我需要的文本。

document.querySelector('textarea').select()

textarea {
  width: 145px;
  height: 15px;
}

<textarea>Title 1: value 1; Title 2: value 2;</textarea>

答案1

得分: 2

以下是您要翻译的内容：

"After some thought, this might be a solution for you (your last comment also taken into account). UPDATE: Fore more flexibility a more appropriate solution has been appended at the end.

The key was to use the text-indent property on and give it a negative value. A few lines of JavaScript are also required (it's self-explanatory since commented). However, it should be mentioned that width of <textarea> varies as it adapts to the visible text. In order to be able to control this behavior at least somewhat, I've set a max-width for <textarea>. Furthermore, the value for the text-ident has to be adjusted every time the text before the visible text changes.</p> <p><!-- begin snippet: js hide: false console: true babel: false --><br /> <!-- language: lang-js --></p> <p>// required vars<br /> let el, visibleText, visibleTextLength;</p> <p>// get specific textarea<br /> el = document.querySelector( 'textarea' );</p> <p>// extract desired text that remains visible<br /> visibleText = el.value.split( '; ' )[0].split( ': ')[1];</p> <p>// get text length of extracted text<br /> visibleTextLength = visibleText.length;</p> <p>// add the cols attribute to the textarea<br /> el.setAttribute( 'cols', visibleTextLength );</p> <p>// selects all the text in the textarea<br /> el.select();</p> <p><!-- language: lang-css --></p> <p>textarea {<br /> width: auto;<br /> max-width: 100px;<br /> height: 15px;<br /> font-size: 14px;<br /> text-indent: -70px;<br /> white-space: nowrap;<br /> overflow: hidden;<br /> resize: none;<br /> }</p> <p><!-- language: lang-html --><br /> <textarea>Title 1: value 1; Title 2: value 2;

UPDATE: A MORE APPROPRIATE SOLUTION

Due to the text-indent dilemma I revised and improved my solution again to get more flexibility. So what changes have been made?

First, must now have an ID assigned to make things work. If the ID is assigned to an element other than a <textarea>, the script exits. Also, an additional CSS part is no longer required to set mandatory style properties. The styling can be handled via script options, but doesn't have to, the old way still works and even has to be used if you want more styling for <textarea>. Things like font-color, background-color, border and the like were not taken into account.</p> <p>If you don't use the script's styling options and create your own CSS rule for <textarea> instead, it MUST contain and have set the following properties to achieve the desired result:</p> <ul> <li>padding - setting left and right to 0 is recommended</li> <li>height - can be customized according to your needs</li> <li>max-width - set it to none if width is not an issue</li> <li>line-height - set to 1 should be fine for general use</li> <li>font-family - a monoytpe font is highly recommended</li> <li>font-size - can be customized according to your needs</li> </ul> <p>Further, as already mentioned, text-ident no longer has to be adjusted manually when the length of the "before-text" changes, where "before-text" is the text before the visible text. The issue was solved by inserting a temporary <span> at the end of the page and placing the "before-text" there. The width can now be derived from this and used for the text-intend. The <span> element is removed from the flow and the visibility is set to hidden so as not to break the design. Once width has been calculated, <span> is automatically removed again.</p> <p><!-- begin snippet: js hide: false console: true babel: false --><br /> <!-- language: lang-js --></p> <p>/* Options */</p> <p>const TxtArea = {<br /> // textarea element ID (string)<br /> elID: 'demo-area',<br /> // text block separator (string)<br /> txtSep: '; ',<br /> // sub text separator (string)<br /> subSep: ': ',<br /> // cut separator from visible text (bool)<br /> cutSep: false,<br /> // invoke event handler only once (bool)<br /> evOnce: true,<br /> // event handler trigger (string)<br /> trigger: 'DOMContentLoaded',<br /> // textarea styling (object)<br /> // set <prop>: false to use CSS value<br /> styles: {<br /> 'padding': '0', // (string)<br /> 'height': '15px', // (string)<br /> 'max-width': '100px', // (string)<br /> 'font-family': 'monospace', // (string)<br /> 'font-size': '14px', // (string)<br /> 'line-height': '1' // (string)<br /> }<br /> };</p> <p>/* Script */</p> <p>TxtArea.init = document.addEventListener( TxtArea.trigger, ( event ) => ( ( opts ) => {</p> <pre><code>let el, elStyle, tempElm, txtSep = '', subSep = '', fullText = '', firstText = '', beforeText = '', visibleText = '', beforeTextLength = 0, visibleTextLength = 0, tempElmIdentifier = 'temp-12345678'; // get specific textarea el = document.getElementById( opts.elID ); // check if it's a textarea if ( el.tagName.toLowerCase() !== 'textarea' ) { console.log( '[ ERROR ] : Custom ID is not assigned to a textarea.' ); return false; } // get textarea CSS properties elStyle = window.getComputedStyle( el, null ); // set required properties el.style.width = 'auto'; el.style.whiteSpace = 'nowrap'; el.style.overflow = 'hidden'; el.style.resize = 'none'; // set custom properties for ( let property in opts.styles ) { if ( opts.styles.hasOwnProperty( property ) && opts.styles[property] !== false ) { el.style[property] = opts.styles[property]; } else { el.style[property] = elStyle.getPropertyValue( property ); } } // trim separators txtSep = opts.txtSep.replace( /^\s+|\s+$/g, '' ); subSep = opts.subSep.replace( /^\s+|\s+$/g, '' ); // get text from textarea fullText = el.value; // extract first text block firstText = fullText.split( txtSep )[0]; // extract text before visible text beforeText = firstText.split( subSep )[0]; // extract visible text visibleText = firstText.split( subSep )[1]; // get text length of extracted text visibleTextLength = visibleText.length; // cut separator from visible text if ( opts.cutSep === true ) { visibleTextLength--; } // create a temporary element to detect beforeText length document.body.appendChild( Object.assign( document.createElement( 'span' ), { id: tempElmIdentifier, style: 'position: absolute; visibility: hidden; width: auto; height: auto; white-space: nowrap;', innerHTML: beforeText + opts.subSep.replace( / /g, '&nbsp;' ) } ) ); // get temporary element tempElm = document.getElementById( tempElmIdentifier ); // assign additional properties tempElm.style.zIndex = -9999; </code></pre> <details> <summary>英文:</summary> <p>After some thought, this might be a solution for you (your last comment also taken into account). <strong>UPDATE:</strong> Fore more flexibility a more appropriate solution has been appended at the end.</p> <p>The key was to use the <code>text-indent</code> property on <code>&lt;textarea&gt;</code> and give it a negative value. A few lines of JavaScript are also required (it's self-explanatory since commented). However, it should be mentioned that <code>width</code> of <code>&lt;textarea&gt;</code> varies as it adapts to the visible text. In order to be able to control this behavior at least somewhat, I've set a <code>max-width</code> for <code>&lt;textarea&gt;</code>. Furthermore, the value for the <code>text-ident</code> has to be adjusted every time the text before the visible text changes.</p> <p><!-- begin snippet: js hide: false console: true babel: false --></p> <p><!-- language: lang-js --></p> <pre><code>// required vars let el, visibleText, visibleTextLength; // get specific textarea el = document.querySelector( &#39;textarea&#39; ); // extract desired text that remains visible visibleText = el.value.split( &#39;;&#39; )[0].split( &#39;:&#39; )[1]; // get text length of extracted text visibleTextLength = visibleText.length; // add the cols attribute to the textarea el.setAttribute( &#39;cols&#39;, visibleTextLength ); // selects all the text in the textarea el.select(); </code></pre> <p><!-- language: lang-css --></p> <pre><code>textarea { width: auto; max-width: 100px; height: 15px; font-size: 14px; text-indent: -70px; white-space: nowrap; overflow: hidden; resize: none; } </code></pre> <p><!-- language: lang-html --></p> <pre><code>&lt;textarea&gt;Title 1: value 1; Title 2: value 2;&lt;/textarea&gt; </code></pre> <p><!-- end snippet --></p> <p><strong>UPDATE: A MORE APPROPRIATE SOLUTION</strong></p> <p>Due to the <code>text-indent</code> dilemma I revised and improved my solution again to get more flexibility. So what changes have been made?</p> <p>First, <strong><code>&lt;textarea&gt;</code> must now have an <code>ID</code> assigned to make things work</strong>. If the <code>ID</code> is assigned to an element other than a <code>&lt;textarea&gt;</code>, the script exits. Also, an additional CSS part is no longer required to set mandatory style properties. The styling can be handled via script options, but doesn't have to, the old way still works and even has to be used if you want more styling for <code>&lt;textarea&gt;</code>. Things like <code>font-color</code>, <code>background-color</code>, <code>border</code> and the like were not taken into account.</p> <p>If you don't use the script's styling options and create your own CSS rule for <code>&lt;textarea&gt;</code> instead, it <strong>MUST</strong> contain and have set the following properties to achieve the desired result:</p> <ul> <li><code>padding</code> - setting <code>left</code> and <code>right</code> to <code>0</code> is recommended</li> <li><code>height</code> - can be customized according to your needs</li> <li><code>max-width</code> - set it to <code>none</code> if <code>width</code> is not an issue</li> <li><code>line-height</code> - set to <code>1</code> should be fine for general use</li> <li><code>font-family</code> - a <strong>monoytpe font</strong> is <strong>highly</strong> recommended</li> <li><code>font-size</code> - can be customized according to your needs</li> </ul> <p>Further, as already mentioned, <code>text-ident</code> no longer has to be adjusted manually when the length of the "before-text" changes, <strong>where "before-text" is the text before the visible text.</strong> The issue was solved by inserting a temporary <code>&lt;span&gt;</code> at the end of the page and placing the "before-text" there. The <code>width</code> can now be derived from this and used for the <code>text-intend</code>. The <code>&lt;span&gt;</code> element is removed from the flow and the <code>visibility</code> is set to <code>hidden</code> so as not to break the design. Once <code>width</code> has been calculated, <code>&lt;span&gt;</code> is automatically removed again.</p> <p><!-- begin snippet: js hide: false console: true babel: false --></p> <p><!-- language: lang-js --></p> <pre><code>/* Options */ const TxtArea = { // textarea element ID (string) elID: &#39;demo-area&#39;, // text block separator (string) txtSep: &#39;; &#39;, // sub text separator (string) subSep: &#39;: &#39;, // cut separator from visible text (bool) cutSep: false, // invoke event handler only once (bool) evOnce: true, // event handler trigger (string) trigger: &#39;DOMContentLoaded&#39;, // textarea styling (object) // set &lt;prop&gt;: false to use CSS value styles: { &#39;padding&#39;: &#39;0&#39;, // (string) &#39;height&#39;: &#39;15px&#39;, // (string) &#39;max-width&#39;: &#39;100px&#39;, // (string) &#39;font-family&#39;: &#39;monospace&#39;, // (string) &#39;font-size&#39;: &#39;14px&#39;, // (string) &#39;line-height&#39;: &#39;1&#39; // (string) } }; /* Script */ TxtArea.init = document.addEventListener( TxtArea.trigger, ( event ) =&gt; ( ( opts ) =&gt; { let el, elStyle, tempElm, txtSep = &#39;&#39;, subSep = &#39;&#39;, fullText = &#39;&#39;, firstText = &#39;&#39;, beforeText = &#39;&#39;, visibleText = &#39;&#39;, beforeTextLength = 0, visibleTextLength = 0, tempElmIdentifier = &#39;temp-12345678&#39;; // get specific textarea el = document.getElementById( opts.elID ); // check if it&#39;s a textarea if ( el.tagName.toLowerCase() !== &#39;textarea&#39; ) { console.log( &#39;[ ERROR ] : Custom ID is not assigned to a textarea.&#39; ); return false; } // get textarea CSS properties elStyle = window.getComputedStyle( el, null ); // set required properties el.style.width = &#39;auto&#39;; el.style.whiteSpace = &#39;nowrap&#39;; el.style.overflow = &#39;hidden&#39;; el.style.resize = &#39;none&#39;; // set custom properties for ( let property in opts.styles ) { if ( opts.styles.hasOwnProperty( property ) &amp;&amp; opts.styles[property] !== false ) { el.style[property] = opts.styles[property]; } else { el.style[property] = elStyle.getPropertyValue( property ); } } // trim separators txtSep = opts.txtSep.replace( /^\s+|\s+$/g, &#39;&#39; ); subSep = opts.subSep.replace( /^\s+|\s+$/g, &#39;&#39; ); // get text from textarea fullText = el.value; // extract first text block firstText = fullText.split( txtSep )[0]; // extract text before visible text beforeText = firstText.split( subSep )[0]; // extract visible text visibleText = firstText.split( subSep )[1]; // get text length of extracted text visibleTextLength = visibleText.length; // cut separator from visible text if ( opts.cutSep === true ) { visibleTextLength--; } // create a temporary element to detect beforeText length document.body.appendChild( Object.assign( document.createElement( &#39;span&#39; ), { id: tempElmIdentifier, style: &#39;position: absolute; visibility: hidden; width: auto; height: auto; white-space: nowrap;&#39;, innerHTML: beforeText + opts.subSep.replace( / /g, &#39;&amp;nbsp;&#39; ) } ) ); // get temporary element tempElm = document.getElementById( tempElmIdentifier ); // assign additional properties tempElm.style.zIndex = -9999; tempElm.style.left = 0; tempElm.style.top = 0; // apply required styles from the textarea to the created element tempElm.style.fontFamily = elStyle.getPropertyValue( &#39;font-family&#39; ); tempElm.style.fontSize = parseFloat( elStyle.getPropertyValue( &#39;font-size&#39; ) ) + &#39;px&#39;; // get beforeText length beforeTextLength = tempElm.clientWidth; // remove temporary element tempElm.remove(); // adjust textarea&#39;s text-indent el.style.textIndent = &#39;-&#39; + beforeTextLength + &#39;px&#39;; // add cols attribute to the textarea el.setAttribute( &#39;cols&#39;, visibleTextLength ); // select all text within textarea el.select(); } ) ( TxtArea ), { once: TxtArea.evOnce } ); </code></pre> <p><!-- language: lang-css --></p> <pre><code>textarea { /* additional styling goes here */ } </code></pre> <p><!-- language: lang-html --></p> <pre><code>&lt;textarea id=&quot;demo-area&quot;&gt;Titel 1: value 1; Title 2: value 2;&lt;/textarea&gt; </code></pre> <p><!-- end snippet --></p> </details> </p> </div> <div class="copyright-post betip" > <div class="be-nav-l"> <div class="be-nav-logo"> <div class="logo-site"> <div class="site-name-main"> <p class="site-description">通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。</p> </div> </div> </div> </div> </div> <div class="clear"></div> <div class="turn-small"></div> <div class="sharing-box betip" data-aos="zoom-in"> <a class="be-btn-beshare be-btn-donate use-beshare-donate-btn" rel="external nofollow" data-hover="打赏"><div class="arrow-share"></div></a> <a class="be-btn-beshare be-btn-like use-beshare-like-btn" data-count="0" rel="external nofollow"> <span class="sharetip bz like-number"> 点赞 </span> <div class="triangle-down"></div> </a> <a class="be-btn-beshare be-btn-share use-beshare-social-btn" 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