[英]Select element from json dynamically
I have a an associative array in php that i parse to get json from it (json_encode) then i store the result in a javascript var 我在php中有一个关联数组,我解析以从中获取json(json_encode),然后将结果存储在javascript var中
var myArray = <?php print json_encode($phpArray); ?>;
Now whene the user hit a button i should choose another element from the array dynamically, for example, i chose a random first element : 现在,当用户按下按钮时,我应该动态地从数组中选择另一个元素,例如,我选择了一个随机的第一个元素:
var an_element = myArray.a2.link;
-'a2' is an array in the main array -'a2'是主数组中的一个数组
-'link' is an element in the a2 array. -“链接”是a2数组中的元素。
So now whene the user hit my button, i want to choose a random other array id (for example a5, a9, etc.) I tried this : 所以现在当用户按下我的按钮时,我想选择一个随机的其他数组ID(例如a5,a9等),我尝试了以下操作:
var randomnumber=Math.floor(Math.random()*101); // choose random number
var newRandomArrayID= "a"+randomnumber;
an_element = myArray.newRandomArrayID.link;
It doesn't works, it says myArray.newRandomArrayID is undefined. 它说myArray.newRandomArrayID是未定义的,这是行不通的。 Anyone can help? 有人可以帮忙吗? Thank you 谢谢
You need to use []
indexing to find properties by name: 您需要使用[]
索引来按名称查找属性:
an_element = myArray[newRandomArrayID].link;
Otherwise JS is looking for a property actually called newRandomArrayID
on myArray
rather than using the value of the variable to lookup the property. 否则,JS会在myArray
上查找实际上称为newRandomArrayID
的属性,而不是使用变量的值来查找该属性。
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