JSON对象中的JavaScript查找属性 [英] JavaScript find property in JSON object
问题描述
我有一个看起来像这样的JSON对象:
I have a JSON object that looks a bit like this:
{
name: 'test',
details: {
description: 'This is the long description',
shortDescription: 'This is the short description (ironically longer than the description!)'
}
}
显然,实际对象比该示例复杂得多,但是我省略了细节,因为它们只会使问题复杂化. 因此,对于这个对象,我有一个试图获取属性值的函数,它看起来像这样:
Obviously the real object is a lot more complicated than this example, but I have omitted the details because they will only complicate the question. So, with this object, I have a function that tries to get the value of the property, it looks like this:
// Private function for matching fields
var _matchField = function (item, filter) {
// Our variables
var text = item[filter.field],
values = filter.expression.split(',');
// If we have any text
if (text) {
// Loop through our values
angular.forEach(values, function (value) {
console.log(text);
console.log(value);
// See if we have a match
if (text.toLowerCase().indexOf(value.toLowerCase()) > -1) {
// We have found a match
return true;
}
});
}
// We have found no matches
return false;
}
问题出在那行:
var text = item[filter.field],
如果属性只是名称,则 item ['name'] 将适用于上述对象.但是如果我想得到描述, item ['details.descrption'] 不起作用. 因此,我需要一个允许我指定属性名称的函数,它将找到该属性并返回其值. 但是在我尝试写一个之前,我希望有人会遇到一个简单的解决方案.
If the property was just the name then item['name'] would work with the above object. But if I want to get the description; item['details.descrption'] doesn't work. So I need a function that will allow me to specify a property name and it will find the property and return its value. But before I try to write one, I was hoping there might be a simple solution that someone has come across.
推荐答案
我通过创建以下函数解决了这个问题:
I solved this by creating this function:
// Private function to get the value of the property
var _getPropertyValue = function (object, notation) {
// Get all the properties
var properties = notation.split('.');
// If we only have one property
if (properties.length === 1) {
// Return our value
return object[properties];
}
// Loop through our properties
for (var property in object) {
// Make sure we are a property
if (object.hasOwnProperty(property)) {
// If we our property name is the same as our first property
if (property === properties[0]) {
// Remove the first item from our properties
properties.splice(0, 1);
// Create our new dot notation
var dotNotation = properties.join('.');
// Find the value of the new dot notation
return _getPropertyValue(object[property], dotNotation);
}
}
}
};
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