使用jQuery选择JSON值 [英] Selecting json values with jQuery

问题描述

我有一个json对象，如下所示:

I have a json object as follows:

[{"Id":"1","Item":"Apples","PricePerKilo":"10.00"},
 {"Id":"3","Item":"Oranges","PricePerKilo":"12.00"}]

我希望获得ID为3的PricePerKilo.

I wish to get the PricePerKilo where the Id is 3.

var fruits = jQuery("#products").data('productData');

fruits顺便持有json对象...

fruits holds the json object by the way...

我将解释我想在SQL中做些什么，因为我发现用这种方法更容易解释

I will explain what I want to do in SQL, because I find it easier to explain this way

SELECT PricePerKilo From fruits WHERE Id = 3 LIMIT 1

推荐答案

您必须循环！ (此外，如果fruits保留JSON而不是数组[不能同时包含两者]，则应首先在其上使用jQuery.parseJSON.)

You must loop! (Also, if fruits holds the JSON and not the array [it can’t hold both] then you should use jQuery.parseJSON on it first.)

var i, fruit;

for(i = 0; fruit = fruits[i]; i++) {
    if(fruit.Id == 3)
        break;
}

fruit将包含Id为3或undefined的水果(如果不存在).

fruit will contain either the fruit with the Id of 3 or undefined if it didn’t exist.

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