Author: John Au-Yeung

Web developer specializing in React, Vue, and front end development.

Categories
Vue Answers

How to customize item-text in Vuetify v-select with Vue.js?

Labrador retriever puppy walking on green grass

Sometimes, we want to customize item-text in Vuetify v-select with Vue.js.

In this article, we’ll look at how to customize item-text in Vuetify v-select with Vue.js.

How to customize item-text in Vuetify v-select with Vue.js?

To customize item-text in Vuetify v-select with Vue.js, we fill in the selection and item slot.

For instance, we write

<template>
  <v-select
    label="Names"
    v-model="name"
    :items="names"
    item-value="id"
    item-text="name"
    return-object
  >
    <template v-slot:selection="{ item }">
      {{ getText(item) }}
    </template>
    <template v-slot:item="{ item }">
      {{ getText(item) }}
    </template>
  </v-select>
</template>

<script>
export default {
  data: () => ({
    names: [
      { id: 1, name: "Paul", age: 23 },
      { id: 2, name: "Marcelo", age: 15 },
      { id: 3, name: "Any", age: 30 },
    ],
    name: null,
  }),
  methods: {
    getText: (item) => `${item.name} - ${item.age}`,
  },
};
</script>

to fill in the selection slot to customize the text for the selection.

And we fill in the slot:item slot to customize the text for the drop down options.

item has the entry in names array for the selection slot.

And item has the entry in names array being rendered in the drop down.

Conclusion

To customize item-text in Vuetify v-select with Vue.js, we fill in the selection and item slot.

Categories
React Native Answers

How to overlay ActivityIndicator in React Native?

Labrador retriever puppy walking on green grass

Sometimes, we want to overlay ActivityIndicator in React Native.

In this article, we’ll look at how to overlay ActivityIndicator in React Native.

How to overlay ActivityIndicator in React Native?

To overlay ActivityIndicator in React Native, we can put it in a modal.

For instance, we write

<Modal
  transparent={true}
  animationType={"none"}
  visible={loading}
  onRequestClose={() => {
    console.log("close modal");
  }}
>
  <View style={styles.modalBackground}>
    <View style={styles.activityIndicatorWrapper}>
      <ActivityIndicator animating={loading} />
    </View>
  </View>
</Modal>

to put the ActivityIndicator in a Modal.

We have transparent set to true to make the modal transparent so we can see the contents underneath it.

And we set the animating to the loading state to make it animate only when loading is true.

Also, we set visible to loading to show the modal only when loading is true.

Conclusion

To overlay ActivityIndicator in React Native, we can put it in a modal.

Categories
JavaScript Answers

How to pass props to the Redirect component with React Router?

Labrador retriever puppy walking on green grass

Sometimes, we want to pass props to the Redirect component with React Router.

In this article, we’ll look at how to pass props to the Redirect component with React Router.

How to pass props to the Redirect component with React Router?

To pass props to the Redirect component with React Router, we put it in the object we set as the value of the to prop.

For instance, we write

<Redirect
  to={{
    pathname: "/order",
    state: { id: "123" },
  }}
/>;

to set the to prop to an object with the state property set to an object with the props.

Then we can get the value of id in the destination route component with

this.props.location.state.id

Conclusion

To pass props to the Redirect component with React Router, we put it in the object we set as the value of the to prop.

Categories
JavaScript Answers

How to add items to an object through the .push() method with JavaScript?

Labrador retriever puppy walking on green grass

Sometimes, we want to add items to an object through the .push() method with JavaScript.

In this article, we’ll look at how to add items to an object through the .push() method with JavaScript.

How to add items to an object through the .push() method with JavaScript?

To add items to an object through the .push() method with JavaScript, we should make sure push is called on array.

For instance, we write

const stuff = [];
stuff.push(element);

to call stuff.push with element to append element as the last element of the stuff` array.

Conclusion

To add items to an object through the .push() method with JavaScript, we should make sure push is called on array.

Categories
JavaScript Answers

How to change label color with Chart.js and JavaScript?

Labrador retriever puppy walking on green grass

Sometimes, we want to change label color with Chart.js and JavaScript.

In this article, we’ll look at how to change label color with Chart.js and JavaScript.

How to change label color with Chart.js and JavaScript?

To change label color with Chart.js and JavaScript, we set the fontColor.

For instance, we write

const ctx = document.getElementById("barChart");
const myChart = new Chart(ctx, {
  type: "bar",
  data: {
    labels: ["label 1", "label 2"],
    datasets: [
      {
        label: "My Label",
        backgroundColor: "rgba(159,170,174,0.8)",
        borderWidth: 1,
        hoverBackgroundColor: "rgba(232,105,90,0.8)",
        hoverBorderColor: "orange",
        scaleStepWidth: 1,
        data: [4, 5],
      },
    ],
  },
  options: {
    legend: {
      labels: {
        fontColor: "blue",
        fontSize: 18,
      },
    },
    scales: {
      yAxes: [
        {
          ticks: {
            fontColor: "green",
            fontSize: 18,
            stepSize: 1,
            beginAtZero: true,
          },
        },
      ],
      xAxes: [
        {
          ticks: {
            fontColor: "purple",
            fontSize: 14,
            stepSize: 1,
            beginAtZero: true,
          },
        },
      ],
    },
  },
});

to set the fontColor of the labels by setting the fontColor in the options object property.

legend.labels has the options for the legend labels.

ticks has the styles for the ticks.

Conclusion

To change label color with Chart.js and JavaScript, we set the fontColor.