JavaScript/jQuery：如何从 .attr("action") 获取参数及其值？

Question

I have a form rendered in Ruby On Rails, looks like this:

<%= form_tag myaction_path(item_id: item.id), 
                            { class: 'myaction', 
                                id: "myaction_#{item.id}", 
                                method: :get, 
                                remote: true } do %>

and I process the data in JS:

$(document).ready(function () { 
  $(".myaction").submit(function(event){  
    event.stopPropagation();
    event.stopImmediatePropagation();
    event.preventDefault();

    console.log($(this).attr("action"));
    ...

console.log($(this).attr("action")); returns /app/myaction?item_id=5528 .

I need the item_id as a key to access other items in the form. Is there any elegant way to fetch it from $(this).attr("action") or do I need to manually parse the string ( /app/myaction?item_id=5528 )?

Answer 1

There is no way to get the query string from the form action. You have to parse it manually.

let str = $(this).attr("action");

function parseQueryString(str) {
  let query = str.split("?");
  if (query.length > 1) {
    let item = query[1].split("=");
    return item[1] ? item[1] : "";
  }
}

let result = parseQueryString(str);
console.log(result);

Answer 2

You can store the item_id in the hidden input field. Or else if you want to parse the item_id or any other field from the action then you can use below js function:

 function parseURL(url) { var searchObject = {} let queries = new URL(url).search.replace(/^\\?/, '').split('&'); for( i = 0; i < queries.length; i++ ) { split = queries[i].split('='); searchObject[split[0]] = split[1]; } return searchObject; }