textarea | 易学教程

Get each line from textarea

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问题 <textarea> put returns between paragraphs for linebreak add 2 spaces at end indent code by 4 spaces quote by placing > at start of line </textarea> $text = value from this textarea; How to: 1) Get each line from this textarea ( $text ) and work with them using foreach() ? 2) Add <br /> to the end of each line, except the last one? 3) Throw each line to an array. Important - text inside textarea can be multilanguage. Have tried to use: $text = str_replace('\n', '<br />', $text); But it doesn't

微信小程序textarea层级过高(盖住其他元素)

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根据官方文档，textarea 是原生组件 (https://developers.weixin.qq.com/miniprogram/dev/component/textarea.html)，所谓原生组件就是 “脱离在 WebView 渲染流程外” 文档中的原话是：原生组件的层级是最高的，所以页面中的其他组件无论设置 z-index 为多少，都无法盖在原生组件上。页面中有弹窗弹出层时，点击弹出层时，底层的textarea也会显示出来，设置z-index没作用。注意：请在真机中测试。微信开发者工具中看不到这样的问题。针对弹窗如何解决？找了个笨方法，有弹窗的时候，就用 wx:if 把 textarea 藏起来，弹出层隐藏的时候再显示textarea。来源： https://www.cnblogs.com/joe235/p/11342172.html

Matlab矩阵如何删除特定的行和列？

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在Matlab2016中，输入矩阵A=[1 2 3;4 5 6;7 8 9];只取矩阵中第一行的元素A1=A(1,:); 若要删除第一行的元素则A(1,:)=[] <textarea readonly="readonly" name="code" class="c++"> >> A=[1 2 3;4 5 6;7 8 9]; >> A1=A(1,:) A1 = 1 2 3 >> A(1,:)=[] A = 4 5 6 7 8 9 </textarea> 如果要删除矩阵A中后面两行，则有 A=[1 2 3;4 5 6;7 8 9]; A(2:3,:)=[] <textarea readonly="readonly" name="code" class="c++"> A=[1 2 3;4 5 6;7 8 9]; A(2:3,:)=[] A = 1 2 3 </textarea> 如果要删除矩阵A中后面两列，则有 A=[1 2 3;4 5 6;7 8 9]; A(:,2:3)=[] <textarea readonly="readonly" name="code" class="c++"> A=[1 2 3;4 5 6;7 8 9]; A(:,2:3)=[] A = 1 4 7 </textarea> 来源： https://blog.csdn.net/qq_40794710

How to change the number of rows in the textarea using jQuery

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问题 I have a textarea with 5 lines. I want to show only one line and on focus it should show remaining 4 lines. 回答1: You can try something like this: $(document).ready(function(){ $('#moo').focus(function(){ $(this).attr('rows', '4'); }); }); where moo is your textarea. 回答2: jQuery(function($){ $('#foo').focus(function(){ $(this).attr('rows',5); }).blur(function(){ $(this).attr('rows',1); }); }); Or, using less jQuery, less typing, and getting a hair more performance: jQuery(function($){ $('#foo'

Remove line break from textarea

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问题 I have a textarea like this: <textarea tabindex="1" maxlength='2000' id="area"></textarea> I watch this textarea with jquery: $("#area").keypress(function (e) { if (e.keyCode != 13) return; var msg = $("#area").val().replace("\n", ""); if (!util.isBlank(msg)) { send(msg); $("#area").val(""); } }); send() submits the message to the server if the return key was pressed and if the message is not blank or only containing line spaces. The problem: After sending the message, the textarea is not

php :: new line in textarea?

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问题 How do you create a new line in a textarea when inserting the text via php? I thought it was \n but that gets literally printed in the textarea. Thanks 回答1: Without seeing your code I cannot be sure, but my guess is you are using single quotes ('\n') instead of double quotes ("\n"). PHP will only evaluate escape sequences if the string is enclosed in double quotes. If you use '\n', PHP will just take that as a literal string. If you use "\n", PHP will parse the string for variables and escape

Max length for HTML <textarea>

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问题 How to restrict the maximum number of characters that can be entered into an HTML <textarea> ? I'm looking for a cross-browser solution. 回答1: The TEXTAREA tag does not have a MAXLENGTH attribute the way that an INPUT tag does, at least not in most standard browsers. A very simple and effective way to limit the number of characters that can be typed into a TEXTAREA tag is: <textarea onKeyPress="return ( this.value.length < 50 );"></textarea> Note: onKeyPress , is going to prevent any button

Automatically resize text area based on content [duplicate]

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问题 This question already has an answer here: Creating a textarea with auto-resize 39 answers On one of my pages, I have a text area html tag for users to write a letter in. I want the content below the text area to shift down, or in other words, I want the text area to resize vertically with each line added to the text area and to have the content below simply be positioned in relation to the bottom of the text area. What I am hoping is that javascript/jquery has a way to detect when the words

How do I fix inconsistent Textarea bottom margin in Firefox and Chrome?

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问题 I'm trying to eliminate the extra bottom margin that both FF and Chrome seem to give to Textareas. Surprisingly IE seems to do it correctly. I would like to avoid using conditional includes but CSS3 tweaks are OK. Sample Code .red-box { background-color: red; overflow: hidden; } textarea { border: solid 1px #ddd; margin: 0px; /* Has no effect */ } <div class="red-box"> <textarea>No Margin Please!</textarea> </div> 回答1: By default, I believe both Chrome and Firefox will set these elements as

Get the offset position of the caret in a textarea in pixels [duplicate]

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This question already has an answer here: How do I get the (x, y) pixel coordinates of the caret in text boxes? 3 answers In my project I'm trying to get the offset position of the caret in a textarea in pixels. Can this be done? Before asking here, I have gone through many links , especially Tim Down's, but I couldn't find a solution which works in IE8+, Chrome and Firefox. It seems Tim Down is working on this . Some other links which I have found have many issues like not finding the top offset of the caret position. I am trying to get the offset position of the caret because I want to show