Category: JavaScript

Categories
JavaScript Answers

How to Position a Div in a Specific Coordinate with JavaScript?

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Sometimes, we want to position a div in a specific coordinate with JavaScript.

In this article, we’ll look at how to position a div in a specific coordinate with JavaScript.

Position a Div in a Specific Coordinate with JavaScript

We can set the style.top and style.left properties to position a div in a specific coordinate with JavaScript.

For instance, we can write:

<div>  
  hello world  
</div>

Then we can set the position of the div by writing:

const d = document.querySelector('div');  
d.style.position = "absolute";  
d.style.left = '10px';  
d.style.top = '20px';

We get the div with document.querySelector .

Then we set its position CSS property to 'absolute' with:

d.style.position = "absolute";

Then we set the left and top CSS properties with:

d.style.left = '10px';  
d.style.top = '20px';

The unit must be specified for left and top.

Conclusion

We can set the style.top and style.left properties to position a div in a specific coordinate with JavaScript.

Categories
JavaScript Answers

How to Add or Update an Attribute to an HTML Element Using JavaScript?

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Sometimes, we want to add or update an element’s attribute with JavaScript.

In this article, we’ll look at how to add or update an element’s attribute with JavaScript.

Use the setAttribute Method

One way to add or update an attribute is to use the setAttribute method.

For instance, we can write:

<div>  
  hello world  
</div>

And:

const d = document.querySelector('div');  
d.setAttribute('style', 'color: red')

to set the text color of the div to red.

We call setAttribute with 'style' and 'color: red' to add the style attribute with the value in the 2nd argument.

Use Set the Property of the Element

We can also set the property with the attribute name to add an attribute.

For instance, we can write:

<div>  
  hello world  
</div>

And:

const d = document.querySelector('div');  
d.style = 'color: red'

Then we set the style attribute with the ‘color: red’ string.

Conclusion

One way to add or update an attribute is to use the setAttribute method.

Also, we can also set the property with the attribute name to add an attribute.

Categories
Vue Answers

How to Fire an Event When the v-model Value Changes with Vue and JavaScript?

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Sometimes, we want to fire an event when the v-model value changes with Vue and JavaScript.

In this article, we’ll look at how to fire an event when the v-model value changes with Vue and JavaScript

Fire an Event When the v-model Value Changes with Vue and JavaScript

We can listen to the change event to do something when the v-model value changes value.

For instance, we can write:

<template>
  <div id="app">
    <input
      type="radio"
      name="fruit"
      value="apple"
      v-model="fruit"
      @change="onChange"
    />
    apple
    <input
      type="radio"
      name="fruit"
      value="orange"
      v-model="fruit"
      @change="onChange"
    />
    orange
    <input
      type="radio"
      name="fruit"
      value="grape"
      v-model="fruit"
      @change="onChange"
    />
    grape
  </div>
</template>

<script>
export default {
  name: "App",
  data() {
    return {
      fruit: "apple",
    };
  },
  methods: {
    onChange() {
      console.log(this.fruit);
    },
  },
};
</script>

We have 3 radio buttons bound to the fruit reactive property with v-model .

In each radio button, we have the @change directive set to the onChange method.

In onChange , we get the this.fruit value.

Now when we click on a radio button, the current this.fruit value should be logged.

It should be one of the value attribute value of each radio button.

Conclusion

We can listen to the change event to do something when the v-model value changes value.

Categories
Vue Answers

How to Toggle Classes on Click with Vue.js with JavaScript?

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Sometimes, we want to toggle classes on click with Vue.js with JavaScript.

In this article, we’ll look at how to toggle classes on click with Vue.js with JavaScript.

Toggle Classes on Click with Vue.js with JavaScript

We can toggle classes by passing an object into the :class prop.

For instance, we write:

<template>
  <div id="app">
    <button @click="setActive">toggle class</button>
    <p :class="{ active }">hello</p>
  </div>
</template>

<script>
export default {
  name: "App",
  data() {
    return {
      active: false,
    };
  },
  methods: {
    setActive() {
      this.active = !this.active;
    },
  },
};
</script>

<style scoped>
.active {
  color: red;
}
</style>

We have the setActive function that toggles the this.active reactive property.

We set that as the value of the @click directive to run it when we click the button.

Then we have :class=”{ active }” to add the active class when active is true .

And we set any element the active class to have color red.

Therefore, when we click the toggle class button, we should see the red color on the text toggle on and off.

Conclusion

We can toggle classes by passing an object into the :class prop.

Categories
Vue Answers

How to Render Newline Characters in Vue.js with JavaScript?

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Sometimes, we want to render newline characters in our Vue.js app with JavaScript.

In this article, we’ll look at how to render newline characters in our Vue.js app with JavaScript.

Render Newline Characters in Vue.js with JavaScript

We can render newline characters in our Vue.js app with the pre tag.

For instance, we can write:

<template>
  <div id="app">
    <pre>{{ text }}</pre>
  </div>
</template>

<script>
export default {
  name: "App",
  data() {
    return {
      text: `You can see the newline after me!\nWoohoo!`,
    };
  },
};
</script>

We have the text reactive property set to a string with a newline character.

Then we interpolate the text in the pre tag to render it as-is.

Conclusion

We can render newline characters in our Vue.js app with the pre tag.