如果JSON存在，如何从JSON中获取特定值
如果JSON存在，如何从JSON中获取特定值
提问于 2019-11-12 04:36:50
我有一个json，如果它存在或不为空，我希望获取一些值。在JSON下面，我想提取"questionGroup“的”选项“。挑战是在某些地方"questionGroup“是空的。
"surveyQuestions": [
{
"questionTitle": "Enter your name",
"questionType": "Text",
"questionGroup": {}
},
{
"questionTitle": "Enter your age",
"questionType": "Number",
"questionGroup": {}
},
{
"questionTitle": "Select your gender",
"questionType": "Single choice",
"questionGroup": {
"options": [
{
"optionText": "Male"
},
{
"optionText": "Female"
}
],
"showRemarksBox": false
}
}
]回答 3
Stack Overflow用户
回答已采纳
发布于 2019-11-12 04:49:25
只需检查这些选项是否未定义。
// Iterate over survey questions
this.surveyQuestions.forEach( question => {
// Check if present or not
if(question.questionGroup.options!=undefined){
console.log(question.questionGroup.options);
return question.questionGroup.options;
}
});Stack Overflow用户
发布于 2019-11-12 05:14:53
为此，您可以使用过滤器方法。
let data = {"surveyQuestions": [
{
"questionTitle": "Enter your name",
"questionType": "Text",
"questionGroup": {}
},
{
"questionTitle": "Enter your age",
"questionType": "Number",
"questionGroup": {}
},
{
"questionTitle": "Select your gender",
"questionType": "Single choice",
"questionGroup": {
"options": [
{
"optionText": "Male"
},
{
"optionText": "Female"
}
],
"showRemarksBox": false
}
}
]}
let result = Array.from(data.surveyQuestions.filter(o => o.questionGroup.options), ({questionGroup}) => questionGroup.options);
console.log(result);Stack Overflow用户
发布于 2019-11-12 04:42:28
surveyQuestions.filter(s => s.questionGroup && Object.keys(s.questionGroup).length)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/58812084
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