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组件开发中难免会遇到子组件父组件之间以及兄弟组件之间的传值问题。 1、父组件传值给子组件： 如果父组件需要将placeholder值传给子组件，则在父组件标签中定义：placeholder="XXX",子组件在data中定义props:['placeholder']来接受，这样接收过来的placeholder就可以直接用this.label取出使用。 注意：props属性只可以取出使用，并不能改变其值。 父组件中： <inputText :placeholder="control.placeholder"></inputText> 子组件中： <input type="text" v-model="modelValue" :placeholder="placeholder"> export default { data() { return { modelValue:'', } }, props:['placeholder'], } 2、子组件传值给父组件： 如果子组件需要将input输入框的值传给父组件，则子组件中定义触发事件v-on:blur="change"(这里用的是失去焦点触发)，在change事件中使用$emit来传值，父组件中定义方法来接受即可，如下 子组件中： <input type="text" v-model="modelValue" :placeholder=

Recently I have been looking at jquery/javascript solutions to emulating the placeholder attribute, but none of them seem to have it right. Common issues are: Native browser support is not used first The form may actually post the value of the placeholder text Inability to recognize between placeholder text and user input if the values are identical (Hey, my email IS user@example.com!! Why won't it submit? Hey I wanted to search for the string "Search" but it won't let me!) Difficult to style or distinguish between regular text and placeholder text Obtrusive implementation (almost always. I

I tried to follow the following topic, but unsuccessfully. Change an HTML5 input's placeholder color with CSS I tried to colorize my placeholder, but it still stay grey on Chrome 17.0.963.56 m. HTML <input type='text' name='test' placeholder='colorize placeholder' value='' /> CSS INPUT::-webkit-input-placeholder, INPUT:-moz-placeholder { color:red; } input[placeholder], [placeholder], *[placeholder] { color:green !important; } JSfiddle http://jsfiddle.net/F4xfV/1/ On Firefox 10.0.2, it works well. Alex You forget a : . Because of that, the whole selector got corrupted and didn't work. http:/

I wanted to substitute the placeholder dynamically in properties in a java application. Like WelcomeMessage=Welcome Mr. {firstName} {lastName} !!! These firstName and LastName variable needs to be substituted dynamically. Should we use velocity template engine for the same? Or are there any other opensource frameworks for the same? Thanks, Manish You can use the MessageFormat class of Java SE. It allows you to do exactly what you ask for. In your case the below code snippet must do the trick, assuming props contains all the properties loaded from your file. MessageFormat.format((String) props

使用jQuery时如果不能区分jQuery对象和Dom对象，会常常它们对应的方法，笔者在工作过程中也是常常查阅资料加深记忆。 jQuery获取input值： 对应的html代码 <input id= "input_example" type = "text" placeholder= "此input example 用来获取input的value值" /> 对应的jQuery代码 var input_value = $( '#input_example' )[ 0 ]. value ; jQuery获取select值 对应的html代码 < select id +" select_example > < option value = "option_value_1" > option text 1 </ option > < option value = "option_value_2" > option text 2 </ option > < option value = "option_value_3" > option text 3 </ option > </ select > 对应的jQuery代码 var select_value = $( "select_example" ).val(); jQuery获取select文本 对应的html代码 < select id