select_tag in rails about selected not change and onchange()

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select_tag in rails about selected not change and onchange()

make it more easy after http://www.cnblogs.com/juandx/p/4058399.html 1 if you want the selected is what you choose after you submit the form use javascripts, then you should do this selected: params[:option] in options_for_select(); 2 if you want…

change和onchange触发为什么不立马生效？

change和onchange触发了,为什么不立马生效?那是因为他们本身不是当文本改变就立马触发的事件,而是当文本改变了,blur离开了表单才触发. 如果要加上触发请结合keyup,keydown,onkeyup,onkeydown使用.具体代码如下: $(function(){ $().on('change keyup',function(){ //请输入效果代码 }) })…

change和onchange、click和onclick的区别

change和onchange.click和onclick的区别: onchange和onclick都是js方法可以在标签元素上使用 <input onchange=""></input> <input onclick=""></input> 也可以 jsobject.onchange=function(){SomeJavaScriptCode}; change和click是jquery方法 $('').…

change和onChange

change是jquery上的绑定事件,可用于下拉框动态关联数据: $(function(){ $("#id").change(function(e){ alert($(this)); }); }); <input id="sdf" name="#" value="3" onChange="fun(this)"/> function fun(e){ alert($(e)); }…

[NPM] Run npm scripts when files change with onchange

In this lesson we will look at how we can setup our npm scripts to execute when the file system has changed. Some common examples of this are automatically linting your code, running unit tests, or using a pre-processor for your CSS. Install: npm i -…

Rails当你运行一个数据库回滚错误：ActiveRecord::IrreversibleMigration exception

最近rails3.2在更改数据库表字段,然后要回滚取消,但在运行rake db:rollback命令,错误: rake aborted! An error has occurred, all later migrations canceled: ActiveRecord::IrreversibleMigration/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.14/lib/active_record/migration/com…