3 examples of 'how to get input from user in javascript' in JavaScript

186
function runInput(){
187
  var scr = editor.getValue();
188
  csInterface.evalScript("$.runScriptFromInput("+$.stringify(scr)+")");
189
}

29
function input(html_id) {
30
    // emulate MATLAB's user-input: use the original (or hacked)
31
    // prompt as selection into DOM by id and return the content. We
32
    // could change this to a pop-up later.
33
    // WARN: We're ignoring the second element, which always seems to be a 's' for string.
34
    var elem = document.getElementById(html_id);
35
    if (elem.tagName === "INPUT") {
36
        return document.getElementById(html_id).value;
37
    } else {  // e.g., "TEXTAREA" 
38
        return elem.textContent;
39
    }
40
}

1690
function processInput (input, code) {
1691
	var data, dataArr, i, c, len;
1692
1693
	switch (typeof input) {
1694
		case 'string':
1695
			data = input;
1696
			break;
1697
		case 'number':
1698
			data = input.toString();
1699
			break;
1700
		case 'object':
1701
			if (input.constructor === window[___JSQR___].prototype.Input) {
1702
				data = input.toString();
1703
			} else if ((Array.isArray || function(o) { return Object.prototype.toString.call(o) === '[object Array]'; })(input)) {
1704
				return input;
1705
			} else {
1706
				data = (new window[___JSQR___].prototype.Input(input.dataType, input.data)).toString();
1707
			}
1708
			break;
1709
		default:
1710
			throw new TypeError('Unsupported input parameter');
1711
	}
1712
1713
	dataArr = (code.encodeMode === code.ENCODE_MODE.UTF8_SIGNATURE ? [0xef, 0xbb , 0xbf] : []);
1714
1715
	if (code.encodeMode === code.ENCODE_MODE.UTF8_SIGNATURE || code.encodeMode === code.ENCODE_MODE.UTF8) {
1716
		// UTF-8 Encode
1717
		for (i = 0, len = data.length; i < len; i++) {
1718
			c = data.charCodeAt(i);
1719
			if (c < 128) {
1720
				dataArr.push(c);
1721
			} else if((c > 127) && (c < 2048)) {
1722
				dataArr.push((c >> 6) | 192, (c & 63) | 128);
1723
			} else {
1724
				dataArr.push((c >> 12) | 224, ((c >> 6) & 63) | 128, (c & 63) | 128);
1725
			}
1726
		}
1727
	} else {
1728
		for (i = 0, len = data.length; i < len; i++) {
1729
			dataArr.push(data.charCodeAt(i));
1730
		}
1731
	}
1732
1733
	return dataArr;
1734
}