placeholder | 易学教程

前端插件之Select2使用

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Select2是一款基于JQuery的下拉列表插件，主要用来优化select，支持单选和多选，同时也支持分组显示、列表检索、远程获取数据等众多好用的功能项目地址： https://select2.org/ 基本使用需要用到的JS和CSS文件位于项目代码下的dist目录中，需要将这个目录中的对应文件放入你的项目里，这一步不赘述引入CSS/JS文件，由于Select2是基于Jquery的，所以要先引入Jquery，这里我们都直接引入CDN的地址  <script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>  <link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.8/css/select2.min.css" rel="stylesheet" /> <script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.8/js/select2.min.js"> </script> 初始化Select2 <select class="form-control" id="id_select2_demo1">

Questions about placeholders in Scala

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问题 Consider the following definition in Scala: val f = ((_: Int) + 1).toString() The code assigns to f the string representation of the function literal _ + 1, which is quite natural, except that this is not i want. i intended to define a function that accepts an int argument, increments it by 1, and returns its string format. To disambiguate, i have to write a lambda expression with explicit parameters: val g = (x: Int) => (x + 1).toString() So can i conclude that the placeholder syntax is not

Adding placeholder to text box in google custom search engine in my html website

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问题 I have added google custom search engine using following code. (function() { var cx = '005899633628958982661:wekn1lpckzg'; var gcse = document.createElement('script'); gcse.type = 'text/javascript'; gcse.async = true; gcse.src = (document.location.protocol == 'https:' ? 'https:' : 'http:') + '//cse.google.com/cse.js?cx=' + cx; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(gcse, s); })(); Now I have a working search box for my site, the only problem is that I am

How to make a scrollbar placeholder

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问题 My problem is that the browser windows vertical scrollbar that is removed by for example overflow:hidden; will make the page jump, when it reappears later. I use jQuery to remove the scroll option from the visitor, while a script is running and scrolling the page to a specific point, and then to make it reappear again afterwards: www.nebulafilm.dk/index.html?content Can I make a placeholder for the scrollbar, when it is not present, so it won't jump back? Or is it possible to "disable" it and

Cannot import correctly maven properties with PropertiesFactoryBean and PropertyPlaceholderConfigurer in spring

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问题 I'm facing problems with a jdbc dynamic properties configurer. I try to explain what exactly the problem is. When I do mvn clean install and right after I deploy the applications in my server (Weblogic 10.3.3), everything is correct, and all the applications work fine. But, every morning, when I try to redeploy the same applications, it was shown an error message like this: Error creating bean with name 'path.to.my.bean.JDBCPropertiesFactoryBean#6015a10' defined in class path resource [spring

Custom Date Input Field without any datepicker

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问题 I have been working on a form elements where I got an idea to implement a date field without any browser built in datepicker or any other supporting jquery library based datepicker. I want to achieve simple datepicker where it will be user-friendly for everyone. I have an idea of 2 different styles and trying to achieve this but not getting exactly as I want. Maybe I have to write some jQuery or so but not sure what to write. What do I want? In the above image, it shows the input field with

placeholder for <h:selectOneMenu>

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问题 I successfully done using placeholder in inputText but i tried this in selectOneMenu can't able to get . instead of martial status in selectOneMenu i want to use placeholder or atleast i want to change martial status color <h:selectOneMenu value=""> <f:selectItem itemValue="0" itemLabel="Marital status"/> <f:selectItem itemValue="1" itemLabel="Single"/> <f:selectItem itemValue="2" itemLabel="married"/> </h:selectOneMenu> 回答1: If I understood you right JSF 1 <f:selectItem itemLabel="Select

Why can't replace placeholder with format function in pymysql?

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问题 How i create the table mingyan . CREATE TABLE `mingyan` ( `tag` varchar(10) DEFAULT NULL, `cont` varchar(255) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8; It's said that string format function with {} is more pythonic way than placeholder % . In my scrapy to write some fields into a table mingyan . self.cursor.execute("insert into mingyan(tag, cont) values (%s, %s)",(item['tag'],item['cont'])) It works fine in my scrapy,now i replace the placeholder way with string format function. self

Swift Placeholder issue

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问题 I have this code var i = 1 println(i) //result is 1 println(%02i) //is wrong I want it to output 01 instead of 1 回答1: Unfortunately, you can't format swift strings like that (as far as I know.) You can try to use an NSString though. println(NSString(format:"%02i", i)) 回答2: This is it var i = 1 NSLog("%02d", i) O/P - 01 回答3: Your best bet is still going to be NSString formatting: var i = 3 println("someInt is now \(i)") // prints "someInt is now 1" println(NSString(format:"%.2f",i)) // prints

Find placeholder pseudo style in google chrome devtools

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问题 I want to test my placeholder style in chrome devtools but can't find it. I tried to use the "Toggle Element State" but it provides only :hover :active :focus-within :focus :visited These are my css lines: .inputs-wrapper input[type="text"]::placeholder , .inputs-wrapper input[type="tel"]::placeholder{ font-weight:900; color:black; } html: <div class="inputs-wrapper"> <input type="text" placeholder="שם מלא"/> <input type="tel" placeholder="טלפון"/> <input type="submit" value="המשך > " /> <