Create a dynamic link based on checkbox values

What I'm trying to achieve is this:

Default state of page = no checkboxes ticked, no link shown

User ticks one (or more) checkboxes

Link appears, dynamically generated from the checkbox values, in the following format: http://example.com/?subject=Products&checked=Blue,Green,Purple (where the selected checkbox values are "Blue", "Green" and "Purple")

Thus far, based on advice from another question (Using JavaScript to load checkbox Values into a string), I've been able to get the values in the proper format (as part of the required url) printed to console.log via a button:

$("button").on("click", function(){
	var arr = []
	$(":checkbox").each(function(){
	   if($(this).is(":checked")){
		 arr.push($(this).val())
	   }
	})
	var vals = arr.join(",")
	var str = "http://example.com/?subject=Products&" + vals
	console.log(str)	
})

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.3/jquery.min.js"></script>
<input type="checkbox" id="selected" name="selected" value="Blue" class="products"> Blue<br>
<input type="checkbox" id="selected" name="selected" value="Green" class="products"> Green<br>
<input type="checkbox" id="selected" name="selected" value="Purple" class="products"> Purple
<br>
<button>button</button>

---

I believe that you were on the right track, if I understood your question correctly. I added the change event on you checkboxes as you suggested. Try the modified code below.

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.3/jquery.min.js"></script>
<input type="checkbox" name="selected" value="Blue" class="products"> Blue<br>
<input type="checkbox" name="selected" value="Green" class="products"> Green<br>
<input type="checkbox" name="selected" value="Purple" class="products"> Purple
<br>
<span class="link"></span>

JavaScript

$("input[type=checkbox]").on("change", function(){
    var arr = []
    $(":checkbox").each(function(){
       if($(this).is(":checked")){
         arr.push($(this).val())
       }
    })
    var vals = arr.join(",")
    var str = "http://example.com/?subject=Products&checked=" + vals
    console.log(str);

  if (vals.length > 0) {
    $('.link').html($('<a>', {
      href: str,
      text: str
    }));
  } else {
    $('.link').html('');
  }  
})

Working CodePen

Your button is no longer being used. Is this what you were looking for?

---

This would work to give you a url of

http://example.com/?subject=Products&checked=Blue,Green,Purple

(see below for a possibly better way):

$(document).on("change", ".mod-link", function() {
  var arr = []
  $(".mod-link:checked").each(function() {
    arr.push($(this).val());
  })
  var vals = arr.join(",")
  var str = "http://example.com/?subject=Products&checked=" + vals;
  var link = arr.length > 0 ? '<a href="'+str+'">Click me</a>': '' ;
  
  $('.link-container').html(link);
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="checkbox" class="mod-link" name="selected" value="Blue" class="products">Blue
<br>
<input type="checkbox" class="mod-link" name="selected" value="Green" class="products">Green
<br>
<input type="checkbox" class="mod-link" name="selected" value="Purple" class="products">Purple
<br>
<div class="link-container"></div>

链接地址: http://www.djcxy.com/p/56010.html

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