List of elements in JSON file with key value pairs and their indexes

Question

List of elements in JSON file with key value pairs and their indexes

Is there a way to create a function that can scan through a JSON file and identify the index where a specific key-value pair is located within an object? For instance, if we were searching for value: '100.0' in the following JSON data, the function should return 0 because the object with key1 is at index 0.

var object = {
    key1 : {
        name : 'xxxxxx',
        value : '100.0'
    },
    key2 : {
        name : 'yyyyyyy',
        value : '200.0'
    },
    key3 : {
        name : 'zzzzzz',
        value : '500.0'
    },
}

javascript ajax json

Answer 1

Answer №1

Check out this neat little code snippet:

http://jsfiddle.net/qskt9Lg9/

function findInJson(key1, value) { //use this function to find a specific key-value pair in JSON
    var i = 0;
    for (var key in object) {  
        var current = object[key];
        if (current[key1] == value) {
            return i; //return the index of the matching pair
        }
        i++;
    }
   return -1; //return -1 if no match found
}

To use the function, simply call it like this:

findInJson("name", "xxxxxx")

If you want to learn more about working with JSON arrays in JavaScript, check out this informative resource: .

Answer 2

Check out this neat little code snippet:

http://jsfiddle.net/qskt9Lg9/

function findInJson(key1, value) { //use this function to find a specific key-value pair in JSON
    var i = 0;
    for (var key in object) {  
        var current = object[key];
        if (current[key1] == value) {
            return i; //return the index of the matching pair
        }
        i++;
    }
   return -1; //return -1 if no match found
}

To use the function, simply call it like this:

findInJson("name", "xxxxxx")

If you want to learn more about working with JSON arrays in JavaScript, check out this informative resource: .

Answer 3

Answer №2

If you are certain that a key in your object will not be removed and added back later, you can utilize the following function:

function findIndex(object, key, value) {
    var index = 0;

    for (var oKey in object) {
        if (object[oKey][key] === value) {
            return index;
        }

        index++;
    }

    return -1;
}

However, keep in mind that the for..in statement iterates over an object in an unpredictable order. Refer to the "Deleted, added or modified properties" section for a more detailed explanation.

If maintaining the order is important, consider using an array and incorporating "keyN" into your {name, value} object.

Answer 4

If you are certain that a key in your object will not be removed and added back later, you can utilize the following function:

function findIndex(object, key, value) {
    var index = 0;

    for (var oKey in object) {
        if (object[oKey][key] === value) {
            return index;
        }

        index++;
    }

    return -1;
}

However, keep in mind that the for..in statement iterates over an object in an unpredictable order. Refer to the "Deleted, added or modified properties" section for a more detailed explanation.

If maintaining the order is important, consider using an array and incorporating "keyN" into your {name, value} object.

Answer 5

Answer №3

If you're looking to move away from supporting IE8 and older versions, consider using the Object.keys() method in your code:

function findIndex(value) {
    for (index = 0; index < Object.keys(dataObject).length; index++) {
        if (dataObject[Object.keys(dataObject)[index]].value === value) {
            return index;
        }
    };
    return -1;
};

console.log( findIndex("100.0") ); // returns  0
console.log( findIndex("500.0") ); // returns  2
console.log( findIndex("800.0") ); // returns -1

Check out this JSFIDDLE link for a live example.

Answer 6

If you're looking to move away from supporting IE8 and older versions, consider using the Object.keys() method in your code:

function findIndex(value) {
    for (index = 0; index < Object.keys(dataObject).length; index++) {
        if (dataObject[Object.keys(dataObject)[index]].value === value) {
            return index;
        }
    };
    return -1;
};

console.log( findIndex("100.0") ); // returns  0
console.log( findIndex("500.0") ); // returns  2
console.log( findIndex("800.0") ); // returns -1

Check out this JSFIDDLE link for a live example.

List of elements in JSON file with key value pairs and their indexes

Answer №1

Answer №2

Answer №3

Similar questions

Encountered an issue with a module not being found while trying to install a published React component library that is built using Rollup. The error message states:

Trouble arises when trying to deploy React application on Github pages

Java ObjectMapper: Incorrect Dimensions in JSON Python Output File

Please send the report in a designated JSON format

A guide on creating a Javascript leap year algorithm using Test-Driven Development techniques

Compiling TypeScript into JavaScript with AngularJS 2.0

Updating a field in Laravel based on a select input within a belongsTo relationship

Photos failing to load in the image slider

How can I use the Jackson library to compare the structure of two JSON objects while ignoring their values?

Utilize AJAX to insert information into a MySQL database when a checkbox is selected

Error: Unable to establish connection to server with docker-compose due to MongoError

Resolved AWS S3 access issue with a 403 Forbidden error by eliminating the "ACL" parameter during upload

What measures can I take to ensure a function is only executed once, even in cases where multiple change events are triggered simultaneously?

JSON objects within a loop may not consistently be present

Is the PHP array being reset and overwritten with each new ajax request?

What is the best location in a Rails application to generate a JSON object?

Can you point me in the right direction to find the Configure function within the EasyRTC module for

What is the reason for requiring this to be passed as an Array instead of a String?

Adjust the navigation menu to display or hide as the page is being scrolled

Using AngularJS $http.get method returns JSON with numeric keys, but we actually do not want any keys