Chris Chen
50 lines
1.6 KiB
TypeScript
50 lines
1.6 KiB
TypeScript
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export class TextareaUtils {
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public static autoExpand(field: HTMLTextAreaElement) {
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//
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if (field) {
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// Reset field height
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field.style.height = '0px';
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const computed = window.getComputedStyle(field);
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// Calculate the height
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var height = 0
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+ parseInt(computed.getPropertyValue('border-top-width'), 10)
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+ field.scrollHeight
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+ parseInt(computed.getPropertyValue('border-bottom-width'), 10);
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field.style.height = height + 'px';
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}
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}
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public static isEditingKeyPress(e: KeyboardEvent) {
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if ([46, 8, 9, 27, 13, 190].indexOf(e.keyCode) !== -1 ||
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// Allow: Ctrl+A
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(e.keyCode === 65 && (e.ctrlKey || e.metaKey)) ||
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// Allow: Ctrl+C
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(e.keyCode === 67 && (e.ctrlKey || e.metaKey)) ||
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// Allow: Ctrl+V
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(e.keyCode === 86 && (e.ctrlKey || e.metaKey)) ||
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// Allow: Ctrl+X
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(e.keyCode === 88 && (e.ctrlKey || e.metaKey)) ||
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// Allow: page up, page down, home, end, left, right
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(e.keyCode >= 33 && e.keyCode <= 39)) {
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// let it happen, don't do anything
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return false;
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}
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if (typeof e.which == "undefined") {
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// This is IE, which only fires keypress events for printable keys
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return true;
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} else if (e.ctrlKey && e.key.toUpperCase() == 'V') {
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return true;
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}
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else if (!e.ctrlKey && !e.metaKey && !e.altKey && e.code != 'Tab' && e.key != 'Control') {
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return true;
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}
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return false;
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}
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}
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