option

Move elements from a listbox to another

由 我与影子孤独终老i 提交于 2019-12-08 06:56:34
问题 Good day to all. I need to do this. I have 2 listboxes and when a button is pressed I need to move an option from one to another. I did this: html: <table border="1" cellpadding="5"> <tr> <td> Un-Selected <br /> <select multiple="multiple" id="selectBoxOne" size="5" class="selectListBox"> <option value="0" id="multiple0">Option 0</option> <option value="1" id="multiple1">Option 1</option> <option value="2" id="multiple2">Option 2</option> <option value="3" id="multiple3">Option 3</option>

Show a text field on a specific option select

由 懵懂的女人 提交于 2019-12-08 04:05:30
问题 I'm trying to learn some jQuery and I can't figure it out, how to show a text field (ID-based of course) when I select a specific option in my select tag. I've Google'd for a answer to my problem, but I haven't find anything yet. There for I'm asking you how I can fix this. See below how I want it. As default: Select tag Option 1 Option 2 Option 3 Text field which is hidden by default. If I choose Option 1 , the text field remains hidden. If I choose Option 2 the result is the same as the

Scala中常见的容器 Option(选项)

由 白昼怎懂夜的黑 提交于 2019-12-07 20:12:05
Scala Option(选项)类型用来表示一个值是可选的（有值或无值)。 Option[T] 是一个类型为 T 的可选值的容器： 如果值存在， Option[T] 就是一个 Some[T] ，如果不存在， Option[T] 就是对象 None 。 接下来我们来看一段代码： // 虽然 Scala 可以不定义变量的类型，不过为了清楚些，我还是 // 把他显示的定义上了 val myMap : Map [ String , String ] = Map ( "key1" -> "value" ) val value1 : Option [ String ] = myMap . get ( "key1" ) val value2 : Option [ String ] = myMap . get ( "key2" ) println ( value1 ) // Some("value1") println ( value2 ) // None 在上面的代码中，myMap 一个是一个 Key 的类型是 String，Value 的类型是 String 的 hash map，但不一样的是他的 get() 返回的是一个叫 Option[String] 的类别。 Scala 使用 Option[String] 来告诉你：「我会想办法回传一个 String，但也可能没有 String 给你」。

in smlnj how do you convert “string option” to “string”?

由 僤鯓⒐⒋嵵緔 提交于 2019-12-07 12:24:36
问题 Please help I have no idea how what a string option does. is it possible to convert string option to a string? 回答1: As already pointed out you could use pattern matching to get the desired result. So, something like this: fun foo(NONE) = "" | foo(SOME a) = a; But you could spare the trouble and use Option.valOf function from SML library instead by just doing: Option.valOf(SOME "my string"); (Or just valOf(SOME "my string"); as newacct pointed out in the comments.) 回答2: The "option" type in ML

Scala 特殊的对象和关键字

由 我的未来我决定 提交于 2019-12-07 11:13:21
Option : 标准类库中的Option类型用样例类来表示那种可能存在、也可能不存在的值。 Option 有两个子类别，一个是 Some，一个是 None，当他回传 Some 的时候，代表这个函式成功地给了你一个 String，而你可以透过 get() 这个函式拿到那个 String，如果他返回的是 None，则代表没有字符串可以给你。 当然，在返回 None，也就是没有 String 给你的时候，如果你还硬要调用 get() 来取得 String 的话，Scala 一样是会报告一个 Exception 给你的 因为 Option[T] 除了 get() 之外，也提供了另一个叫 getOrElse() 的函式，这个函式正如其名－－如果 Option 里有东西就拿出来，不然就给个默认值。 参考url implicit （隐式转换）: *以implicit关键字声明的带有单个参数的函数。*implicit conversion function ,这样的函数将被自动应用，将值从一种类型转换为另一种类型。 【 example】 我们想把整数n转换成分数n/1. <!-- lang: scala --> implicit def int2Fraction (n: Int) = Fraction(n, 1) 这样就可以用如下表达式求值： <!-- lang: scala --> val

JOptionPane showOptionDialog

由 て烟熏妆下的殇ゞ 提交于 2019-12-07 10:58:46
问题 I want to create a showOptionDialog using JOptionPane that has two buttons: Metric and Imperial. If say, Metric is clicked on, the Metric GUI will load. Conversely, if Imperial is clicked on, then the Imperial GUI will load. How do I do this? Many thanks. 回答1: int choice = JOptionPane.showOptionDialog(null, //Component parentComponent "Metric or Imperial?", //Object message, "Choose an option", //String title JOptionPane.YES_NO_OPTION, //int optionType JOptionPane.INFORMATION_MESSAGE, //int

iOS 7 doesn't show more than one line when option is longer than screen size

由 主宰稳场 提交于 2019-12-07 10:05:46
问题 iOS 7 does not show more than one line in html option s: <select> <option value="volvo">Volvo test test test test test test </option> <option value="saab">Saab</option> <option value="opel">Opel</option> <option value="audi">Audi</option> </select> It just truncates it with ellipsis. Has anyone else noticed this with just a standard HTML option ? Perhaps it is an iOS 7 bug because it was not happening on iOS6? I pulled this directly from the w3schools site. To reproduce, take your iPhone

Setting the selected attribute on an option element for real using jQuery

由 假装没事ソ 提交于 2019-12-07 04:01:22
问题 I am generating a select list with option elements in jQuery. Simplified it looks like this: var sel = $("<select>"); $.each(data, function(i, v){ $("<option>").attr({ "value": i }).html(v).appendTo(sel); }); Then I want an option to be selected. Normally I would do something like: $(sel).val(1); But then the option does not have the selected attribute present. $(sel).html() gives something like: <option value="1">1</option> <option value="2">2</option> and this is what I expected: <option

How to enable harmony in Coffeescript?

由 好久不见. 提交于 2019-12-07 02:29:00
问题 Here is how I run my js code: node --harmony ./data/app.js Now I want to move to the CoffeeScript. So I try to run it like that: coffee ./data/app.coffee And it fails. How can I pass this --harmony option? 回答1: To pass args through, you can use the --nodejs argument: coffee --nodejs --harmony ./data/app.coffee 来源： https://stackoverflow.com/questions/13548196/how-to-enable-harmony-in-coffeescript

Scala: Something like Option (Some, None) but with three states: Some, None, Unknown

由 只愿长相守 提交于 2019-12-07 02:05:54
问题 I need to return values, and when someone asks for a value, tell them one of three things: Here is the value There is no value We have no information on this value (unknown) case 2 is subtly different than case 3. Example: val radio = car.radioType we know the value: return the radio type, say "pioneer" b. there is no value: return None c. we are missing data about this car, we don't know if it has a radio or not I thought I might extend scala's None and create an Unknown, but that doesn't
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