Javascript - 如果URL字符串的最后一个字符是“+”，那么删除它......怎么样？

Question

This is a continuation from an existing question. Javascript - Goto URL based on Drop Down Selections (continued!)

I am using dropdown selects to allow my users to build a URL and then hit "Go" to goto it.

Is there any way to add an additional function that checks the URL before going to it?

My URLs sometimes include the "+" character which I need to remove if its the last character in a URL. So it basically needs to be "if last character is +, remove it"

This is my code:

$(window).load(function(){
    $('form').submit(function(e){
        window.location.href = 
            $('#dd0').val() +
            $('#dd1').val()+
            $('#dd2').val()+
            $('#dd3').val();
        e.preventDefault();
    });
});

Answer 1

var url = /* whatever */;

url = url.replace(/\+$/, '');

For example,

> 'foobar+'.replace(/\+$/, '');
  "foobar"

Answer 2

function removeLastPlus (myUrl)
{
    if (myUrl.substring(myUrl.length-1) == "+")
    {
        myUrl = myUrl.substring(0, myUrl.length-1);
    }

    return myUrl;
}

$(window).load(function(){
    $('form').submit(function(e){
        var newUrl = $('#dd0').val() +
            $('#dd1').val()+
            $('#dd2').val()+
            $('#dd3').val();
        newUrl = removeLastPlus(newUrl);
        window.location.href = newUrl;
        e.preventDefault();
    });
});

Answer 3

Found another solution using str.endsWith("str")

 var str = "Hello this is test+"; if(str.endsWith("+")) { str = str.slice(0,-1); console.log(str) } else { console.log(str); } 

Answer 4

 function removeLastPlus(str) { if (str.slice(-1) == '+') { return str.slice(0, -1); } return str; } 

Answer 5

<script type="text/javascript">
  function truncate_plus(input_string) {
    if(input_string.substr(input_string.length - 1, 1) == '+') {
      return input_string.substr(0, input_string.length - 1);
    }
    else
    {
      return input_string;
    }
  }
</script>

Answer 6

$(window).load(function(){
    $('form').submit(function(e){
        var newUrl = $('#dd0').val() +
            $('#dd1').val()+
            $('#dd2').val()+
            $('#dd3').val();
        newUrl = newUrl.replace(/\+$/, '');
        window.location.href = newUrl;
        e.preventDefault();
    });
});

Just seems easier.