To begin, you can determine the size of your input by accessing its dimensions using the following code snippet:
const element = document.getElementById('yourInputId');
const elementStyle = window.getComputedStyle(element);
const inputSize = {width: elementStyle.width, height: elementStyle.height};
Next, in a separate method and assuming you have knowledge of the font and font-size of your text (if not, refer to Angular Documentation), you can create a function like this:
pixelLength(text: string, fontSize: number) {
const canvas = document.createElement('CANVAS');
const attribute = document.createAttribute('id');
attribute.value = 'myId';
canvas.setAttributeNode(attribute);
document.body.appendChild(canvas);
const context: any = document.getElementById('myId');
const ctx = context.getContext('2d');
ctx.font = fontSize.toString() + 'px Helvetica';
const length = ctx.measureText(text).width;
document.body.removeChild(canvas);
return length;
}
You may choose to utilize this function within a custom form control to determine if it exceeds the inputSize.width
.
If you have any questions or need clarification, feel free to ask :) Happy coding!