你如何將值從collection_select傳遞給Rails中的onchange函數？

Question

我想將從我的collection_select下拉列表中選擇的值傳遞給onchange函數。當我的名字，我的價值打印爲來源[指數]，但我想這不是作爲文本本身的價值。

<%= 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

我認爲這將是一個例子如下：

<%= 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 

希望能幫助你

Answer 2

試試這個：

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

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

Answer 3

從 「名」 來更改參數「this.value」解決了我的問題。

<%= 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); 
}