What does html textarea mean? How to get newlines and spaces in textarea tags?-HTML Tutorial-php.cn

What does html textarea mean? How to get newlines and spaces in textarea tags?

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Release： 2018-08-16 18:00:29

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html What does textarea mean? How to get newlines and spaces in textarea tags? This article mainly talks about the definition and usage of html textarea, as well as a detailed explanation of attributes.

html textarea definition and usage:

tag defines a multi-line text input control.

The text area can hold an unlimited amount of text, and the default font for the text is a fixed-width font (usually Courier).

You can specify the size of the textarea through the cols and rows attributes, but a better way is to use the CSS height and width attributes.

Note: Use "%OD%OA" (carriage return/line feed) to separate lines of text in the text input area.

Tip: You can set the line wrapping mode in the text input area through the wrap attribute of the tag.

HTML Tag example:

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html Attributes of textarea:

What does html textarea mean? How to get newlines and spaces in textarea tags?

## Tags in HTML Textarea attributes and usage:

1.cols, vertical columns. Without setting the style sheet, it represents the number of bytes that can fit in one line. For example, cols=60 means that a line can hold up to 60 bytes, which is 30 Chinese characters. Another thing to note is that the width of the text box is adjusted through this. Enter the value of cols, and then define the size of the input text font (if not defined, the default value will be used), then the width of the text box will be determined.

2.rows, horizontal columns. Indicates the number of rows that can be displayed. For example, rows=10 means that 10 rows can be displayed. If there are more than 10 lines, you need to drag the scroll bar to browse.

3.name, the name of the text box, this is essential because it must be used when storing text.

4.warp, when warp="off" means that the text area does not wrap automatically. Of course, if it is not written, the default is automatic wrapping. This parameter is generally used less frequently.

5.style, this is a very practical parameter that can be used to set the background color of the text box, scroll bar color and form, border color, input font size and color, etc.

6.class, generally used to call settings in external css.

Get the newline characters and spaces in the textarea tag:

Question: Get the format (line breaks, spaces) in the textarea tag and store it in the database. Able to retain the basic format when displaying.

Solution:

In IE9 and above, FF and chrome, change the line to \n. In IE7-8, change the line to \r\n, and the spaces are all \s

Therefore, you need to use replace to replace the \n and \r\n of different browsers with the of the html code, and replace the \s space with the of html

Note: If you use jQuery's val () Get the value of textarea. The value obtained does not contain the carriage return (\r) character. But if the value is passed to the server via XHR, the carriage return (\r) character will be preserved (or added by the browser, but the carriage return (\r) character will not be included in the original data).

This example replaces both \r and \r\n. The actual effect is not affected. You just need to pay attention to the difference.

The code is as follows:

html:

<textarea name="" id="text" cols="30" rows="3"></textarea>
<input type="button" id="btn" value="测试测试" />
<div id="show"></div>

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js:

document.getElementById("btn").onclick = function() {
var strContent = document.getElementById("text").value;
alert("处理前的strContent为\r\n"+strContent);
strContent = strContent.replace(/\r\n/g, &#39;<br/>&#39;); //IE9、FF、chrome
strContent = strContent.replace(/\n/g, &#39;<br/>&#39;); //IE7-8
strContent = strContent.replace(/\s/g, &#39; &#39;); //空格处理
alert("转换之后的html代码为\r\n"+strContent);
document.getElementById("show").innerHTML = strContent;
};

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