option | 易学教程

Linux下搭建DHCP服务器

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一.DHCP所需软件包 dhcp-common-4.1.1-34.Pl.el6.centos.x86_64 dhcp-4.1.1-34.pl.el6.centon.x86_64 二.编辑主配置文件 vi/etc/dhcp/dhcpd.conf ddns-update-style interim; ignore client-updates; shared-network ifs { option domain-name "ifs.com"; option domain-name-servers 192.168.0.1; default-lease-time 21600; max-lease-time 43200; subnet 192.168.0.0 netmask 255.255.0.0 { option routers 192.168.0.1; option subnet-mask 255.255.0.0; option time-offset -18000; range dynamic-bootp 192.168.0.10 192.168.0.15; } } 1、ddns-update-style 类型定义所支持的 DNS动态更新类型（必选）,一般我们设置成关闭,interim和 none 都是关闭的意思， 2、subnet 网络号 netmask 子网掩码

How to hide optgroup/option elements?

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问题 Is there a way to hide option or optgroup HTML elements? I've tried calling hide() in jQuery, and also using regular Javascript to set style.display='none' . It works in Firefox but not in any other browsers. Actually removing them from the DOM does work, so perhaps there's a way to save each DOM element when it's removed, and reinsert them in the same place? My HTML is like this: <select name="propsearch[area]" id="propsearch_area"> <option value="0">- Any -</option> <optgroup label="Bristol

It is bad to put <span /> tags inside <option /> tags, only for string manipulation not styling?

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I would like to make groups of the text content of an <option /> tag. Say I have the following: <option>8:00 (1 hour)</option> , the time pattern 8:00 can be modified, then the text in parenthesis (1 hour) can also be modified. I was thinking of doing something like <option> <span>8:00</span> <span> (1 hour)</span> </option> It is bad to put <span /> tags inside <option /> tags, only for string manipulation not styling? From the HTML 4.01 spec: <!ELEMENT OPTION - O (#PCDATA) -- selectable choice --> From the HTML 5 draft spec: Content model: Text. (Even the HTML 3.2 and HTML 2 specs say: <

Is there a way to apply a CSS style on HTML5 datalist options?

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I would like to modify the way that the list of the different options of my datalist are displayed. Is it possible to apply on it some CSS properties ? <input list="languages" id="language_id"> <datalist id="languages"> <option value="html">HTML</option> <option value="java">Java</option> <option value="perl">Perl</option> <option value="php">PHP</option> <option value="ruby-on-rails">Ruby on Rails</option> </datalist> I tried option { background: red; } but it does not seem to work. Like select elements, the datalist element has very little flexibility in styling. You cannot style any of the

how to make sure select option text align in the center in IE?

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问题 The following CSS works in FF, but not in IE(at least 8.0), how can I make sure that the text align in the center for IE8.0? Thanks!!! select, option { text-align: center; } 回答1: Unfortunately, you can't change the alignment of SELECT items in IE, although it surprises me that even IE 8 keeps this bad habit. 回答2: Given that this is not possible in IE, I think you would have to resort to: Implementing your own SELECT widgets. There are many JS libraries that do this, mostly because SELECT

Get Text From <option> Tag Using PHP

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问题 I want to get text inside the <option> tags as well as its value. Example <select name=\"make\"> <option value=\"5\"> Text </option> </select> I used $_POST[\'make\']; and I get the value 5 but I want to get both value and the text . How can I do it using PHP? 回答1: In order to get both the label and the value using just PHP, you need to have both arguments as part of the value. For example: <select name="make"> <option value="Text:5"> Text </option> </select> PHP Code <?php $parts = $_POST[

JQuery Hide Option doesn't work in IE and Safari

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问题 I\'m trying to hide a few options in a dropdown box using .hide(). This works perfectly fine in firefox and chrome, but it doesn\'t work in IE and Safari. My original code is more complex but I\'ve narrowed it down to this. I\'ve tried several combinations and nothing has worked. .hide() works, but not for things within option tags for some reason. Can someone please help me? This is driving me nuts. Thank you so much for taking the time help! Here\'s my jscript: <script type=\"text

爬虫无头浏览器规避监测

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无头浏览器 - phantomJs：无可视化界面的浏览器 - 谷歌无头浏览器： from selenium.webdriver.chrome.options import Options。 chrome_options = Options() chrome_options.add_argument('--headless') chrome_options.add_argument('--disable-gpu') browser = webdriver.Chrome(executable_path=path, chrome_options=chrome_options) # 无头浏览器举例 from selenium import webdriver from selenium.webdriver.chrome.options import Options from time import sleep chrome_options = Options() chrome_options.add_argument('--headless') chrome_options.add_argument('--disable-gpu') bro = webdriver.Chrome(executable_path='chromedriver.exe', chrome_options

How to check if an option is selected?

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问题 $(\'#mySelectBox option\').each(function() { if ($(this).isChecked()) alert(\'this option is selected\'); else alert(\'this is not\'); }); Apparently, the isChecked doesn\'t work. SO my question is what is the proper way to do this? Thanks. 回答1: UPDATE A more direct jQuery method to the option selected would be: var selected_option = $('#mySelectBox option:selected'); Answering the question .is(':selected') is what you are looking for: $('#mySelectBox option').each(function() { if($(this).is(

What's the difference of “./configure” option “--build”, “--host” and “--target”?

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问题 The script ./configure accepts 3 options --build , --host and --target . I\'m confusing their roles. What\'s the difference and semantics of them? 回答1: As noted in this blog post and alluded to in the GCC Configure Terms, --target only applies when you are compiling toolchains. When you are doing normal cross-compilation of a library or binary you use --build=the architecture of the build machine --host=the architecture that you want the file to run on However, when you are building