Tips for retaining the previous positions of sliders post page refresh

Question

Tips for retaining the previous positions of sliders post page refresh

Currently, I have a network visualization project created with d3 and angular. You can view the visualization by following this link. I'm interested in saving the last state of the network so that even after refreshing the page, it will display the same setup. However, I am unsure of how to achieve this.

I've read about using either `sessionStorage` or `localStorage` for this purpose, but I'm struggling to implement it in my visualization project.

My attempt involved storing JSON data in sessionStorage like so:

 if (sessionStorage) {
        sessionStorage.setItem("myKey", myJSON.toString());
    }

 if (sessionStorage) {
        sessionStorage.getItem("myKey"); // {"myKey": "some value"}
    }

I also tried a similar approach using localStorage:

localStorage.setItem("networkGraph", networkGraph);
var networkGraph = localStorage.getItem("networkGraph");

Unfortunately, these methods did not work as intended. Can anyone confirm if this is the correct way to accomplish my goal?

Your assistance on this matter would be greatly appreciated!

javascript angularjs d3.js

Answer 1

Answer №1

Have you considered using localStorage instead of sessionStorage? With sessionStorage, any saved data will be erased when the browser tab is closed.

In your onChange function, you can use

localStorage.setItem('inputLayerHeight', vm.inputLayerHeight);

to store the value of inputLayerHeight. Then, retrieve it with

Number.parseInt(localStorage.getItem('inputLayerHeight')) || 15

to set the value at the value property of the vm.inputLayerHeightSlider object. This method can also be applied to other values that need to be retained.

Answer 2

Have you considered using localStorage instead of sessionStorage? With sessionStorage, any saved data will be erased when the browser tab is closed.

In your onChange function, you can use

localStorage.setItem('inputLayerHeight', vm.inputLayerHeight);

to store the value of inputLayerHeight. Then, retrieve it with

Number.parseInt(localStorage.getItem('inputLayerHeight')) || 15

to set the value at the value property of the vm.inputLayerHeightSlider object. This method can also be applied to other values that need to be retained.

Answer 3

Answer №2

You're so close to getting it right! Just make a small tweak with how you're using localStorage. All you need to do is include the window or $window (a more 'angulary' approach to accessing the window variable) variable in your code like this:

$window.localStorage.setItem("networkGraph", JSON.stringify(networkGraph));

By the way, have you checked out angular-storage? It's a great tool for simplifying local storage operations and making your life easier :)

Answer 4

You're so close to getting it right! Just make a small tweak with how you're using localStorage. All you need to do is include the window or $window (a more 'angulary' approach to accessing the window variable) variable in your code like this:

$window.localStorage.setItem("networkGraph", JSON.stringify(networkGraph));

By the way, have you checked out angular-storage? It's a great tool for simplifying local storage operations and making your life easier :)

Answer 5

Answer №3

The issue might be stemming from how data is being stored in your local storage. Currently, you are saving the data as a string, which d3 may not recognize as valid data options. To resolve this, consider the following approach:

if (localStorage) {
    // Convert the stored data into a JavaScript object
    const data = JSON.parse(localStorage.getItem("myKey"));
} else {
    // Fetch the data...
    // Store it in either sessionStorage or localStorage
   localStorage.setItem("myKey", myJSON.toString());
}

You can adjust the logic based on your needs, but the key point is to use JSON.parse() when retrieving data from storage.

Answer 6

The issue might be stemming from how data is being stored in your local storage. Currently, you are saving the data as a string, which d3 may not recognize as valid data options. To resolve this, consider the following approach:

if (localStorage) {
    // Convert the stored data into a JavaScript object
    const data = JSON.parse(localStorage.getItem("myKey"));
} else {
    // Fetch the data...
    // Store it in either sessionStorage or localStorage
   localStorage.setItem("myKey", myJSON.toString());
}

You can adjust the logic based on your needs, but the key point is to use JSON.parse() when retrieving data from storage.

Tips for retaining the previous positions of sliders post page refresh

Answer №1

Answer №2

Answer №3

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