It is not possible to apply a background color to an HTML element located outside of the App.Vue

Question

It is not possible to apply a background color to an HTML element located outside of the App.Vue

Hey there, thanks for taking the time to read my query!

I am interested in adding a gradient background color to a specific page on my Vue application. I tried applying the following code in components/Frontpage.Vue:

html {
  background: linear-gradient(45deg, #17ead9, #6078ea);
  height: 100vh;
  margin: 0;
  background-attachment: fixed;
}

However, it seems like the background remains white. Surprisingly, when I place the exact same code in App.Vue, it works perfectly fine. To bypass this issue, I've resorted to importing an external CSS file, but it's not the most elegant solution. Does anyone have any suggestions?

EDIT: Essentially, I need to place the background styling within Frontpage.vue because it should only appear on that particular page. Unfortunately, as it is scoped, I can't access the 'html' element.

Thank you for reading through my query, even if you're unable to offer a solution. This marks my debut post on StackOverflow!

css vue.js vuejs2 vue-component

Answer 1

Answer №1

One possible reason for this issue could be the presence of a scoped attribute in the style tag:

<style scoped>
html {
  background: linear-gradient(45deg, #17ead9, #6078ea);
  height: 100vh;
  margin: 0;
  background-attachment: fixed;
}
</style>

When using the scoped attribute in a <style> tag, the CSS rules will only apply to elements within the current component.

To resolve this issue, you can either remove the scoped attribute from your CSS or use multiple style tags if you do not want all styles to be scoped.

<style>
html {
  background: linear-gradient(45deg, #17ead9, #6078ea);
  height: 100vh;
  margin: 0;
  background-attachment: fixed;
}
</style>

<style scoped>
h1 {
  color: white;
}
</style>

edit1

If you want to apply different styles to <html> when changing pages,

1. Toggle class in vue-router's afterEach hook

router.afterEach((to, from) => {
  if (to.name === "page2") {
    document.querySelector("html").classList.add("page2");
  } else {
    document.querySelector("html").classList.remove("page2");
  }
});

2. Add html.page2 style

<style>
html.page2 {
  background-color: gray;
}
</style>

3. Example:

https://codesandbox.io/s/zz989l87m3

Answer 2

One possible reason for this issue could be the presence of a scoped attribute in the style tag:

<style scoped>
html {
  background: linear-gradient(45deg, #17ead9, #6078ea);
  height: 100vh;
  margin: 0;
  background-attachment: fixed;
}
</style>

When using the scoped attribute in a <style> tag, the CSS rules will only apply to elements within the current component.

To resolve this issue, you can either remove the scoped attribute from your CSS or use multiple style tags if you do not want all styles to be scoped.

<style>
html {
  background: linear-gradient(45deg, #17ead9, #6078ea);
  height: 100vh;
  margin: 0;
  background-attachment: fixed;
}
</style>

<style scoped>
h1 {
  color: white;
}
</style>

edit1

If you want to apply different styles to <html> when changing pages,

1. Toggle class in vue-router's afterEach hook

router.afterEach((to, from) => {
  if (to.name === "page2") {
    document.querySelector("html").classList.add("page2");
  } else {
    document.querySelector("html").classList.remove("page2");
  }
});

2. Add html.page2 style

<style>
html.page2 {
  background-color: gray;
}
</style>

3. Example:

https://codesandbox.io/s/zz989l87m3

Answer 3

Answer №2

If you want to dynamically add or remove classes in Vue, you can utilize Vue lifecycle methods.

created() {
 document.querySelector("html").classList.add("someOtherClass");
},
destroyed() {
  document.querySelector("html").classList.remove("someOtherClass");
}

Remember to define the css class outside of the scoped block for it to work properly.

<style>
 .someOtherClass {
   color: blue;
 }
</style>

<style scoped>
  ... the rest of your style definitions 
</style>

Best wishes!

Answer 4

If you want to dynamically add or remove classes in Vue, you can utilize Vue lifecycle methods.

created() {
 document.querySelector("html").classList.add("someOtherClass");
},
destroyed() {
  document.querySelector("html").classList.remove("someOtherClass");
}

Remember to define the css class outside of the scoped block for it to work properly.

<style>
 .someOtherClass {
   color: blue;
 }
</style>

<style scoped>
  ... the rest of your style definitions 
</style>

Best wishes!

Answer 5

Answer №3

Big shoutout to everyone who offered assistance, but I managed to find a clever solution.

In my App.vue file, I included the following code:

* {
    margin: 0;
    padding: 0;
    border: 0;
    outline: 0;
    font-size: 100%;
    vertical-align: baseline;
    background: transparent;
}

This allowed me to avoid having to edit the HTML directly for the full-page background. The highest element in components/frontpage.vue (which functions as one large container) now occupies the entire page, enabling me to apply a background on this element within a <style> tag.

#Frontpage {
    background: linear-gradient(45deg, #17ead9, #6078ea);
    height: 100vh;
    margin: 0;
    background-attachment: fixed;
}

As a result, my webpage now features a full-screen blue background that seamlessly transitions when navigating to another page without requiring a refresh.

Answer 6

Big shoutout to everyone who offered assistance, but I managed to find a clever solution.

In my App.vue file, I included the following code:

* {
    margin: 0;
    padding: 0;
    border: 0;
    outline: 0;
    font-size: 100%;
    vertical-align: baseline;
    background: transparent;
}

This allowed me to avoid having to edit the HTML directly for the full-page background. The highest element in components/frontpage.vue (which functions as one large container) now occupies the entire page, enabling me to apply a background on this element within a <style> tag.

#Frontpage {
    background: linear-gradient(45deg, #17ead9, #6078ea);
    height: 100vh;
    margin: 0;
    background-attachment: fixed;
}

As a result, my webpage now features a full-screen blue background that seamlessly transitions when navigating to another page without requiring a refresh.

It is not possible to apply a background color to an HTML element located outside of the App.Vue

Answer №1

edit1

1. Toggle class in vue-router's afterEach hook

2. Add html.page2 style

3. Example:

Answer №2

Answer №3

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