Enhance User Experience in IE11 by Providing Font Size Customization with Angular (Using CSS Variables)

Question

Enhance User Experience in IE11 by Providing Font Size Customization with Angular (Using CSS Variables)

I am in the process of developing an Angular application. One of the requirements is to allow the user to choose between small, medium, or large font sizes (with medium being the default) and adjust the font size across the entire webpage accordingly. While the var() function can be used for other browsers, it is not compatible with IE. Manually setting the font-size for each HTML tag using ngStyle or ngClass is one way to go about it, but I personally find this approach less than ideal. Is there a more efficient way to achieve this without having to duplicate this code in every single component?

<div class="hm-header-title" [ngStyle]="fontSize()"></div>

fontSize(){
    return this.ieStyleService.fontSize() // for example, return {'font-size': '11px'}
}

html css angular internet-explorer-11 css-variables

Answer 1

Answer №1

Consider manually implementing this solution specifically for Internet Explorer.

applyFontSizeChanges(fontSize){
    ieFontSizeSelectors=[
        '.someClass1 *',
        '.someClass2 *',
        ...
        ...
        ...
    ]

    if(this.isIE()){
        ieFontSizeSelectors.forEach((selector: string) => {
                let elements = document.querySelectorAll(selector) as NodeListOf<HTMLElement>;

                let i = 0;
                for (i = 0; i < elements.length; i++) {
                    elements[i].style.fontSize = fontSize;
                }
            });
    }
}

Remember to include the * wildcard in the selectors to target all child elements.

Answer 2

Consider manually implementing this solution specifically for Internet Explorer.

applyFontSizeChanges(fontSize){
    ieFontSizeSelectors=[
        '.someClass1 *',
        '.someClass2 *',
        ...
        ...
        ...
    ]

    if(this.isIE()){
        ieFontSizeSelectors.forEach((selector: string) => {
                let elements = document.querySelectorAll(selector) as NodeListOf<HTMLElement>;

                let i = 0;
                for (i = 0; i < elements.length; i++) {
                    elements[i].style.fontSize = fontSize;
                }
            });
    }
}

Remember to include the * wildcard in the selectors to target all child elements.

Answer 3

Answer №2

Utilize the cascading feature of CSS and/or em/rem to create dynamic font sizes.

The concept is simple in theory but may require some adjustments in practice.

Begin by setting the font size for the body:

body{font-size: 16px;}

Next, define the font size for elements that should have dynamic fonts:

.lbl{font-size: 1rem}

By altering the font-size property of the body, you can easily change the font size of all labeled elements automatically.

It's worth noting that using float values can also improve the results:

.lbl {font-size: 1.33rem}

Regarding rem/em units:

rem and em units are converted to pixel values by the browser based on font sizes in your design. em units are relative to the font size of the element they are applied to, while rem units are relative to the font size of the HTML element. em units can be affected by font size inheritance from parent elements.

const $btn = document.getElementById("tgl");
$btn.addEventListener("click", () => {
  document.body.classList.toggle("large");
});

body {
  font-size: 16px;
}

body.large {
  font-size: 32px;
}

label {
  font-size: 1em;
}

<body>
    <label>I have dynamic font size</label>
    <button id="tgl">Toggle font size</button>
</body>

Answer 4

Utilize the cascading feature of CSS and/or em/rem to create dynamic font sizes.

The concept is simple in theory but may require some adjustments in practice.

Begin by setting the font size for the body:

body{font-size: 16px;}

Next, define the font size for elements that should have dynamic fonts:

.lbl{font-size: 1rem}

By altering the font-size property of the body, you can easily change the font size of all labeled elements automatically.

It's worth noting that using float values can also improve the results:

.lbl {font-size: 1.33rem}

Regarding rem/em units:

rem and em units are converted to pixel values by the browser based on font sizes in your design. em units are relative to the font size of the element they are applied to, while rem units are relative to the font size of the HTML element. em units can be affected by font size inheritance from parent elements.

const $btn = document.getElementById("tgl");
$btn.addEventListener("click", () => {
  document.body.classList.toggle("large");
});

body {
  font-size: 16px;
}

body.large {
  font-size: 32px;
}

label {
  font-size: 1em;
}

<body>
    <label>I have dynamic font size</label>
    <button id="tgl">Toggle font size</button>
</body>

Answer 5

Answer №3

Personally, I have chosen not to experiment with the following solution due to my belief that IE11 is on the decline. I currently overlook it as my audience is well-defined and I can steer them away from it if needed.

However, in a scenario where you must provide support for IE11, one approach you could take is to define the font size at the outset of the application:

:host {
  font-size: 16px;
}

Subsequently, you can utilize rem (root em units) for all your CSS rules to ensure they are relative to the root font size:

h1 {
  font-size: 1.2rem;
}

It is worth mentioning that IE11 does have support for rem units. More information on this can be found at https://caniuse.com/rem

Lastly, remember that adjusting the root font size will impact all other elements that inherit from it. For instance, you could set it like this:

this.elementRef.nativeElement.style.setProperty('font-size', '12px');

Alternatively, you can make the change directly on the DOM like so:

document.style.setProperty('font-size', '12px');

These suggestions are simply meant to provide a starting point, and I regret that I do not have the capacity to delve deeper into this topic at the moment. Nonetheless, I hope this guidance proves useful to you.

Answer 6

Personally, I have chosen not to experiment with the following solution due to my belief that IE11 is on the decline. I currently overlook it as my audience is well-defined and I can steer them away from it if needed.

However, in a scenario where you must provide support for IE11, one approach you could take is to define the font size at the outset of the application:

:host {
  font-size: 16px;
}

Subsequently, you can utilize rem (root em units) for all your CSS rules to ensure they are relative to the root font size:

h1 {
  font-size: 1.2rem;
}

It is worth mentioning that IE11 does have support for rem units. More information on this can be found at https://caniuse.com/rem

Lastly, remember that adjusting the root font size will impact all other elements that inherit from it. For instance, you could set it like this:

this.elementRef.nativeElement.style.setProperty('font-size', '12px');

Alternatively, you can make the change directly on the DOM like so:

document.style.setProperty('font-size', '12px');

These suggestions are simply meant to provide a starting point, and I regret that I do not have the capacity to delve deeper into this topic at the moment. Nonetheless, I hope this guidance proves useful to you.

Enhance User Experience in IE11 by Providing Font Size Customization with Angular (Using CSS Variables)

Answer №1

Answer №2

Answer №3

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