Question

在页面加载时，我正在检查URL地址栏中是否有字符串，如果是，则应该在URL中更改带有该字符串的菜单项文本。但如果没有字符串，那么它应该写一个不同的文本。

var hash = document.location.hash;

// create an object to act like a dictionary to store each value indexed by its key
var partDic = {};

// remove the leading "#" and split into parts
var parts = hash.substring(1).split('&');

// If you just want the first value, whatever it is, use this.
// But be aware it's a URL so can be set to anything in any order, so this makes little sense
// var string = parts[0].split('=')[1];

// build the dictionary from each part
$.each(parts, function(i, v) {
  // do the "=" split now
  var arr = v.split("=");

  // decode to turn "%5B" back into "[" etc
  var key = decodeURIComponent(arr[0]);
  var value = decodeURIComponent(arr[1]);

  // store in our "dictionary" object
  partDic[key] = value;
});

var timeoutId = setInterval(function() {
if ("comboFilters[Agencies]" in partDic) {
    var ag = partDic["comboFilters[Agencies]"].substring(1);
    $('.Agency .dropdown-toggle').html(ag).append(' <span class="caret"></span>');
} else {
$('.Agency .dropdown-toggle').html("All agencies").append(' <span class="caret"></span>');
}

if ("comboFilters[Clients]" in partDic) {
    var cl = partDic["comboFilters[Clients]"].substring(1);
    $('.Client .dropdown-toggle').html(cl).append(' <span class="caret"></span>');
} else {
$('.Client .dropdown-toggle').html("All clients").append(' <span class="caret"></span>');
}

if ("comboFilters[Years]" in partDic) {
    var yr = partDic["comboFilters[Years]"].substring(1).slice(1);
    $('.Year .dropdown-toggle').html(yr).append(' <span class="caret"></span>');
} else {
$('.Year .dropdown-toggle').html("All years").append(' <span class="caret"></span>');
}
clearInterval(timeoutId);
}, 1000);

正在发生的事情是，如果没有字符串，则菜单项不会正确地拾取else文本。

网址为：

http://www.example.com/xchanges/#comboFilters%5BAgencies%5D=&comboFilters%5BYears%5D=.y2012

使用该URL，代理商的菜单项应该选择All agencies，因为它是空的，但它没有这样做。它什么都没打印

Answer 1

只要comboFilters [Agencies]在url参数中，您的代码就会在partDic中创建一个名为comboFilters [Agencies]的键，但它是否有值。

您需要检查值

//if it exists and has a non empty value
if(partDic['comboFilters[Agencies]'] && partDic['comboFilters[Agencies]'] != ""){

} else {

}

Answer 2

问题是代理商值为空，但仍在添加到您的partDic列表中

这将检查是否有值

$.each(parts, function(i, v) {
  // do the "=" split now
  var arr = v.split("=");

  // decode to turn "%5B" back into "[" etc
  var key = decodeURIComponent(arr[0]);
  var value = decodeURIComponent(arr[1]);

  if( value ) {
  // store in our "dictionary" object
  partDic[key] = value;
  }


});

如果不在URL中的字符串执行此操作

2 个答案: