Javascript Jquery - 从分隔字符串创建一个数组，然后评估其值

Jquery - Create an array from a delimited string and then evaluate its values

提问by matteo

i've this problem i'm not really able to solve.

我有这个问题，我真的无法解决。

i have this string "B01, B20, B03, "

我有这个字符串“B01，B20，B03，”

i would like to create a jQuery array off this string using the "," as delimiter then remove the last element ( that would be blank ) and then for each value of the array make an alert.

我想使用“,”作为分隔符从这个字符串创建一个 jQuery 数组，然后删除最后一个元素（这将是空白），然后为数组的每个值发出警报。

Something like...

就像是...

 var theString = "B01, B20, B03, ";

    var theArray = (theString, ',');

    theArray = remove_last_element;  (??)

    $('theArray').each(function() {

      alert(theArray[?].value); 

    });

Any hint ?

任何提示？

Thanks !

谢谢 ！

回答by Jon Hinson

var theString = "B01, B20, B03, ";

$.each(theString.split(",").slice(0,-1), function(index, item) {
    alert(item); 
});

Let me know if you have any questions.

如果您有任何问题，请告诉我。

回答by Guffa

There is no such thing as a "jQuery array". You use a Javascript array.

没有“jQuery 数组”这样的东西。您使用 Javascript 数组。

You can't just turn a string into an array because it contains comma separated values. You have to use something to parse the string, which would be the splitmethod in this case:

您不能仅仅将字符串转换为数组，因为它包含逗号分隔值。你必须使用一些东西来解析字符串，这将是split这种情况下的方法：

var theString = "B01, B20, B03, ";
var theArray = theString.split(", ");

This produces an array with four items, as there is a trailing separator, so you can check for that and remove it:

这将生成一个包含四个项目的数组，因为有一个尾随分隔符，因此您可以检查并删除它：

if (theArray.length > 0 && theArray[theArray.length - 1].length == 0) {
  theArray.pop();
}

Then you can either use plain Javascript or a jQuery method to loop the array. The plain Javascript looks like this:

然后你可以使用普通的 Javascript 或 jQuery 方法来循环数组。普通的 Javascript 如下所示：

for (var i = 0; i < theArray.length; i++) {
  alert(theArray[i]);
}

Using a jQuery method looks like this:

使用 jQuery 方法如下所示：

$.each(theArray, function(index, item) {
  alert(item);
});

You can also skip the step of removing the item, and just check for empty items in the loop:

您也可以跳过删除项目的步骤，只需检查循环中的空项目：

var theString = "B01, B20, B03, ";
var theArray = theString.split(", ");
for (var i = 0; i < theArray.length; i++) {
  if (theArray[i].length > 0) {
    alert(theArray[i]);
  }
}

回答by lonesomeday

You don't need jQuery for this. Use String.prototype.splitto split the string, then loop through it with for.

为此，您不需要 jQuery。使用String.prototype.split通过它来分割字符串，然后循环for。

var theString = "B01, B20, B03, ",
    bits = theString.split(', ').slice(0, -1); // split the string and remove the last one

for (var i = 0; i < bits.length; i++) {
    alert(bits[i]);
}

回答by bjornd

var theString = "B01, B20, B03, ",
    theArray = theString.split(', ');

theArray.pop();
$(theArray).each(function() {
  alert(this); 
});

回答by Adam Bailin

The only jquery I used below was to "trim" the value to see if it was empty. Otherwise, I used split and splice (plain ol' javascript).

我在下面使用的唯一 jquery 是“修剪”值以查看它是否为空。否则，我使用 split 和 splice (plain ol' javascript)。

var theString = "B01, B20, B03, ";
var theArray = theString.split(',');
for(i=0; i<theArray.length; i++) {
  // check if any array element is empty, if so, take it out of the array
  if ($.trim(theArray[i]) == "")
    theArray.splice(i, 1); // remove element since it's blank
}

// now you can iterate over the "real" values of the array
$.each(theArray, function(i, value) {
  alert(value);
});

回答by loganfsmyth

var str = "B01, B20, B03, ";

$.each(str.split(','), function(i, val) {
  val = $.trim(val);
  alert(val);
});

回答by Sahil Muthoo

cleanString = function(str) {
    return $.grep(str.split(','), function(elem) {
        return ($.trim(elem) !== '')
    });
}

This function will return an array with all split by comma with all the blanks removed. Check out $.grep.

此函数将返回一个数组，所有数组均以逗号分隔，并删除了所有空格。查看$.grep。

Usage

用法

cleanString("B01, B20, B03, ");

Alerting the array should be simple enough. It's just a matter of iterating over the returned array.

提醒阵列应该足够简单。这只是迭代返回的数组的问题。

  var arr = cleanString("B01, B20, B03, ");
  $.each(arr, function(index, value) { 
      alert(value); 
  });