Introduction to PHP form elements: selection field tags and text field tags

Select field tags and

A list can be created by selecting the field tags and Or menu. The menu is used to save space. Only one option of the menu can be seen in the normal state. Only after clicking the lower triangle button on the right to open the menu can you see all the options. A list can display a certain number of options. If this number is exceeded, a scroll bar will automatically appear and the viewer can drag the scroll bar to view each option.

The syntax format is as follows:

<select name="name" size="value" multiple>
<option value="value" selected>选项1</option>
<option value="value" >选项2</option>
<option value="value" >选项3</option>
.......
<select>

The parameter name represents the name of the selection field; the parameter size represents the number of rows in the list; the parameter value represents the menu option value; the parameter multiple represents the display of data in menu mode , the data is displayed in list mode by default.

The display methods and examples of the selection field tags and are as follows:

1. List mode

<select name=" lag " id=" lag ">
<option value="0" selected>PHP</option>
<option value="1" >JAVA</option>
<option value="2" >HTML5</option>
<select>

Running results As follows:

Description: Drop-down list box, create a list by selecting the field tags and . The list can display a certain number of options. If it exceeds When this number is reached, a scroll bar will automatically appear, and the viewer can view each option by dragging the scroll bar. selectedAttribute is used to set the menu to be selected by default.

Form

consists of form elements. Commonly used form elements include the following tags: input field tags , selection field tags and , text area tags , etc.

2. Menu mode

<select name=" lag " id=" lag " multiple>
<option value="0" selected>PHP</option>
<option value="1" >JAVA</option>
<option value="2" >HTML5</option>
<select>

The running results are as follows:

Explanation: Use the multiple attribute In the menu list

tag, the user who specifies this option can use the shift and ctrl keys to make multiple selections.

Tips: In the above description, only the method of adding static menu is given. In the process of web program development, it can also be dynamically added through loop statement. Add menu items.

Text area tag

##Text area tag is used to create A multi-line text field in which more text can be entered. <p></p>The syntax format is as follows: <p><pre class="brush:html;toolbar:false"><textarea name="name" rows=value cols=value value="value" warp="value"> ....文本内容 <textarea></pre></p>The parameter name represents the name of the text field; the parameter rows represents the number of rows in the text field; the parameter cols represents the number of columns in the text field (rows and cols here are represented by (in bytes): The parameter value represents the default value of the text field; the parameter warp is used to set the line wrapping method when displaying and sending. The value of off means no automatic line wrapping, and the value of hard means automatic hard return and line wrapping, with the line wrapping mark. It is sent to the server, and it will also wrap when outputting. The value "soft" means automatic soft carriage return and line wrapping. The line feed mark will not be sent to the server, and the output will still be one column. <p></p>The value and example of the text area tag <textarea> are as follows: <p><pre class="brush:html;toolbar:false"><textarea name="remark" rows="4" cols="2" id="remark"> 请输入您的介绍！ <textarea></pre></p> Description: Text area, also called <p>multiline text box<a href="http://www.php.cn/code/5983.html" target="_blank">, is used for multiple lines The text editing warp attribute defaults to automatic line wrapping. </a></p>The following is a specific example to understand the difference between the hard and soft line break tags of the warp attribute. The example code is as follows: <p><pre class="brush:html;toolbar:false"><!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>form</title> </head> <body> <form name="form1" method="post" action="index.php"> <textarea name="a" cols="20" rows="3" warp="soft">这里使用的是软回车！输出后不换行！</textarea> <textarea name="b" cols="20" rows="3" warp="hard">这里使用的是硬回车！输出后会自动换行！</textarea> <input type="submit" name="submit" value="提交"> </form> </body> </html> <?php echo nl2br($_POST[&#39;a&#39;])."<br>"; echo nl2br($_POST[&#39;b&#39;]); ?></pre></p>HTML tag is used to obtain the <p>string in multi-line editing<a href="http://www.php.cn/wiki/57.html" target="_blank">, the newline mark will not be displayed. The above example will output the following results: </a></p> <p><img src="https://img.php.cn//upload/image/699/627/225/1492312704853509.png" title="1492312704853509.png" alt="Introduction to PHP form elements: selection field tags and text field tags"></p>Note: The effect of using hard and soft line break tags is not visible on the browser and can only be selected after submitting the form. You can see the effect of executing the line break mark by executing the "right-click/view web page source code" command in the browser, or view it after conversion through nl2br()<p>function<a href="http://www.php.cn/wiki/145.html" target="_blank">. </a></p> <p>Form </p> <form> consists of form elements. Commonly used form elements include the following tags: input field tags <input>, selection field tags <select> and <span style="line-height: 1.76em;"><option>, text area tags <textarea>, etc. In the previous section, we introduced the input field mark <input><a href="http://www.php.cn/php-weizijiaocheng-360437.html" target="_self"> of the introduction of </a>PHP form elements. This section focuses on the selection field tags <select> and <option> and the text area tag <textarea>.

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