你如何将值从collection_select传递给Rails中的onchange函数？

Question

我想将从我的collection_select下拉列表中选择的值传递给onchange函数。当我的名字，我的价值打印为来源[指数]，但我想这不是作为文本本身的价值。

<%= collection_select(:source, :index, @sources, :id, :name, options = {include_blank: "Please select a source..."}, html_options = {:onchange => "updateTextArea(name)"}) %> 

function updateTextArea(source){ 
var value = source; 
console.log(value); 
} 

Answer 1

我认为这将是一个例子如下：

<%= f.collection_select(:id, index.sources, :id, :name,options = {include_blank: "Please select a source..."}, html_options = {:onchange => "updateTextArea(name)"}) %> #-> f is a form tag this you use this form 

希望能帮助你

Answer 2

试试这个：

html_options = {:onchange => "updateTextArea()"} 

function updateTextArea() { 
    console.log($(this).val()); 
} 

Answer 3

从 “名” 来更改参数“this.value”解决了我的问题。

<%= collection_select(:source, :index, @sources, :id, :name, options = {include_blank: "Please select a source..."}, html_options = {:onchange => "updateTextArea(this.value)"}) %> 

function updateTextArea(source){ 
var value = source; 
console.log(value); 
}