将JQuery变量设置为HTML元素属性子字符串

Question

I'd like to set a variable to equal the text of a substring. Specifically, if a[href] begins with "download.php", I'd like to set the variable "elm" to the value of a[href], after the 19th character.

if ("a[href^='download.php']") {
    var elm = $('a[href]'.substring(19));
};

I've tried using .text() and .html(), but can't get it working. Can someone point out my errors? Many thanks.

Answer 1

You dont need your if statement, since you are passing a string which is a truthy value.

To get the value of href atributte use $.attr

var elm = $("a[href^='download.php']").attr('href').substring(19);

and if you want to check if exists any element who match with [href^='download.php'] use

var el = $("a[href^='download.php']");
if(el.length) {
    var elm = el.first().attr('href').substring(19);
}

Answer 2

var a = $("a[href^='download.php']");
if (a.length) {
  var elm = a.attr("href").substring(19);
}