node-red-contrib-snap4city-user
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Nodes for Snap4city project, targeted to standard user (no developer)
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JavaScript
// Cross-broswer implementation of text ranges and selections
// documentation: http://bililite.com/blog/2011/01/17/cross-browser-text-ranges-and-selections/
// Version: 1.1
// Copyright (c) 2010 Daniel Wachsstock
// MIT license:
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
(function () {
bililiteRange = function (el, debug) {
var ret;
if (debug) {
ret = new NothingRange(); // Easier to force it to use the no-selection type than to try to find an old browser
} else if (document.selection) {
// Internet Explorer
ret = new IERange();
} else if (window.getSelection && el.setSelectionRange) {
// Standards. Element is an input or textarea
ret = new InputRange();
} else if (window.getSelection) {
// Standards, with any other kind of element
ret = new W3CRange();
} else {
// doesn't support selection
ret = new NothingRange();
}
ret._el = el;
ret._textProp = textProp(el);
ret._bounds = [0, ret.length()];
return ret;
};
function textProp(el) {
// returns the property that contains the text of the element
if (typeof el.value != 'undefined') return 'value';
if (typeof el.text != 'undefined') return 'text';
if (typeof el.textContent != 'undefined') return 'textContent';
return 'innerText';
}
// base class
function Range() {}
Range.prototype = {
length: function () {
return this._el[this._textProp].replace(/\r/g, '').length; // need to correct for IE's CrLf weirdness
},
bounds: function (s) {
if (s === 'all') {
this._bounds = [0, this.length()];
} else if (s === 'start') {
this._bounds = [0, 0];
} else if (s === 'end') {
this._bounds = [this.length(), this.length()];
} else if (s === 'selection') {
this.bounds('all'); // first select the whole thing for constraining
this._bounds = this._nativeSelection();
} else if (s) {
this._bounds = s; // don't error check now; the element may change at any moment, so constrain it when we need it.
} else {
var b = [
Math.max(0, Math.min(this.length(), this._bounds[0])),
Math.max(0, Math.min(this.length(), this._bounds[1]))
];
return b; // need to constrain it to fit
}
return this; // allow for chaining
},
select: function () {
this._nativeSelect(this._nativeRange(this.bounds()));
return this; // allow for chaining
},
text: function (text, select) {
if (arguments.length) {
this._nativeSetText(text, this._nativeRange(this.bounds()));
if (select == 'start') {
this.bounds([this._bounds[0], this._bounds[0]]);
this.select();
} else if (select == 'end') {
this.bounds([this._bounds[0] + text.length, this._bounds[0] + text.length]);
this.select();
} else if (select == 'all') {
this.bounds([this._bounds[0], this._bounds[0] + text.length]);
this.select();
}
return this; // allow for chaining
} else {
return this._nativeGetText(this._nativeRange(this.bounds()));
}
},
insertEOL: function () {
this._nativeEOL();
this._bounds = [this._bounds[0] + 1, this._bounds[0] + 1]; // move past the EOL marker
return this;
}
};
function IERange() {}
IERange.prototype = new Range();
IERange.prototype._nativeRange = function (bounds) {
var rng;
if (this._el.tagName == 'INPUT') {
// IE 8 is very inconsistent; textareas have createTextRange but it doesn't work
rng = this._el.createTextRange();
} else {
rng = document.body.createTextRange();
rng.moveToElementText(this._el);
}
if (bounds) {
if (bounds[1] < 0) bounds[1] = 0; // IE tends to run elements out of bounds
if (bounds[0] > this.length()) bounds[0] = this.length();
if (bounds[1] < rng.text.replace(/\r/g, '').length) { // correct for IE's CrLf wierdness
// block-display elements have an invisible, uncounted end of element marker, so we move an extra one and use the current length of the range
rng.moveEnd('character', -1);
rng.moveEnd('character', bounds[1] - rng.text.replace(/\r/g, '').length);
}
if (bounds[0] > 0) rng.moveStart('character', bounds[0]);
}
return rng;
};
IERange.prototype._nativeSelect = function (rng) {
rng.select();
};
IERange.prototype._nativeSelection = function () {
// returns [start, end] for the selection constrained to be in element
var rng = this._nativeRange(); // range of the element to constrain to
var len = this.length();
if (document.selection.type != 'Text') return [len, len]; // append to the end
var sel = document.selection.createRange();
try {
return [
iestart(sel, rng),
ieend(sel, rng)
];
} catch (e) {
// IE gets upset sometimes about comparing text to input elements, but the selections cannot overlap, so make a best guess
return (sel.parentElement().sourceIndex < this._el.sourceIndex) ? [0, 0] : [len, len];
}
};
IERange.prototype._nativeGetText = function (rng) {
return rng.text.replace(/\r/g, ''); // correct for IE's CrLf weirdness
};
IERange.prototype._nativeSetText = function (text, rng) {
rng.text = text;
};
IERange.prototype._nativeEOL = function () {
if (typeof this._el.value != 'undefined') {
this.text('\n'); // for input and textarea, insert it straight
} else {
this._nativeRange(this.bounds()).pasteHTML('<br/>');
}
};
// IE internals
function iestart(rng, constraint) {
// returns the position (in character) of the start of rng within constraint. If it's not in constraint, returns 0 if it's before, length if it's after
var len = constraint.text.replace(/\r/g, '').length; // correct for IE's CrLf wierdness
if (rng.compareEndPoints('StartToStart', constraint) <= 0) return 0; // at or before the beginning
if (rng.compareEndPoints('StartToEnd', constraint) >= 0) return len;
for (var i = 0; rng.compareEndPoints('StartToStart', constraint) > 0; ++i, rng.moveStart('character', -1));
return i;
}
function ieend(rng, constraint) {
// returns the position (in character) of the end of rng within constraint. If it's not in constraint, returns 0 if it's before, length if it's after
var len = constraint.text.replace(/\r/g, '').length; // correct for IE's CrLf wierdness
if (rng.compareEndPoints('EndToEnd', constraint) >= 0) return len; // at or after the end
if (rng.compareEndPoints('EndToStart', constraint) <= 0) return 0;
for (var i = 0; rng.compareEndPoints('EndToStart', constraint) > 0; ++i, rng.moveEnd('character', -1));
return i;
}
// an input element in a standards document. "Native Range" is just the bounds array
function InputRange() {}
InputRange.prototype = new Range();
InputRange.prototype._nativeRange = function (bounds) {
return bounds || [0, this.length()];
};
InputRange.prototype._nativeSelect = function (rng) {
this._el.setSelectionRange(rng[0], rng[1]);
};
InputRange.prototype._nativeSelection = function () {
return [this._el.selectionStart, this._el.selectionEnd];
};
InputRange.prototype._nativeGetText = function (rng) {
return this._el.value.substring(rng[0], rng[1]);
};
InputRange.prototype._nativeSetText = function (text, rng) {
var val = this._el.value;
this._el.value = val.substring(0, rng[0]) + text + val.substring(rng[1]);
};
InputRange.prototype._nativeEOL = function () {
this.text('\n');
};
function W3CRange() {}
W3CRange.prototype = new Range();
W3CRange.prototype._nativeRange = function (bounds) {
var rng = document.createRange();
rng.selectNodeContents(this._el);
if (bounds) {
w3cmoveBoundary(rng, bounds[0], true, this._el);
rng.collapse(true);
w3cmoveBoundary(rng, bounds[1] - bounds[0], false, this._el);
}
return rng;
};
W3CRange.prototype._nativeSelect = function (rng) {
window.getSelection().removeAllRanges();
window.getSelection().addRange(rng);
};
W3CRange.prototype._nativeSelection = function () {
// returns [start, end] for the selection constrained to be in element
var rng = this._nativeRange(); // range of the element to constrain to
if (window.getSelection().rangeCount == 0) return [this.length(), this.length()]; // append to the end
var sel = window.getSelection().getRangeAt(0);
return [
w3cstart(sel, rng),
w3cend(sel, rng)
];
};
W3CRange.prototype._nativeGetText = function (rng) {
return rng.toString();
};
W3CRange.prototype._nativeSetText = function (text, rng) {
rng.deleteContents();
rng.insertNode(document.createTextNode(text));
this._el.normalize(); // merge the text with the surrounding text
};
W3CRange.prototype._nativeEOL = function () {
var rng = this._nativeRange(this.bounds());
rng.deleteContents();
var br = document.createElement('br');
br.setAttribute('_moz_dirty', ''); // for Firefox
rng.insertNode(br);
rng.insertNode(document.createTextNode('\n'));
rng.collapse(false);
};
// W3C internals
function nextnode(node, root) {
// in-order traversal
// we've already visited node, so get kids then siblings
if (node.firstChild) return node.firstChild;
if (node.nextSibling) return node.nextSibling;
if (node === root) return null;
while (node.parentNode) {
// get uncles
node = node.parentNode;
if (node == root) return null;
if (node.nextSibling) return node.nextSibling;
}
return null;
}
function w3cmoveBoundary(rng, n, bStart, el) {
// move the boundary (bStart == true ? start : end) n characters forward, up to the end of element el. Forward only!
// if the start is moved after the end, then an exception is raised
if (n <= 0) return;
var node = rng[bStart ? 'startContainer' : 'endContainer'];
if (node.nodeType == 3) {
// we may be starting somewhere into the text
n += rng[bStart ? 'startOffset' : 'endOffset'];
}
while (node) {
if (node.nodeType == 3) {
if (n <= node.nodeValue.length) {
rng[bStart ? 'setStart' : 'setEnd'](node, n);
// special case: if we end next to a <br>, include that node.
if (n == node.nodeValue.length) {
// skip past zero-length text nodes
for (var next = nextnode(node, el); next && next.nodeType == 3 && next.nodeValue.length == 0; next = nextnode(next, el)) {
rng[bStart ? 'setStartAfter' : 'setEndAfter'](next);
}
if (next && next.nodeType == 1 && next.nodeName == "BR") rng[bStart ? 'setStartAfter' : 'setEndAfter'](next);
}
return;
} else {
rng[bStart ? 'setStartAfter' : 'setEndAfter'](node); // skip past this one
n -= node.nodeValue.length; // and eat these characters
}
}
node = nextnode(node, el);
}
}
var START_TO_START = 0; // from the w3c definitions
var START_TO_END = 1;
var END_TO_END = 2;
var END_TO_START = 3;
// from the Mozilla documentation, for range.compareBoundaryPoints(how, sourceRange)
// -1, 0, or 1, indicating whether the corresponding boundary-point of range is respectively before, equal to, or after the corresponding boundary-point of sourceRange.
// * Range.END_TO_END compares the end boundary-point of sourceRange to the end boundary-point of range.
// * Range.END_TO_START compares the end boundary-point of sourceRange to the start boundary-point of range.
// * Range.START_TO_END compares the start boundary-point of sourceRange to the end boundary-point of range.
// * Range.START_TO_START compares the start boundary-point of sourceRange to the start boundary-point of range.
function w3cstart(rng, constraint) {
if (rng.compareBoundaryPoints(START_TO_START, constraint) <= 0) return 0; // at or before the beginning
if (rng.compareBoundaryPoints(END_TO_START, constraint) >= 0) return constraint.toString().length;
rng = rng.cloneRange(); // don't change the original
rng.setEnd(constraint.endContainer, constraint.endOffset); // they now end at the same place
return constraint.toString().length - rng.toString().length;
}
function w3cend(rng, constraint) {
if (rng.compareBoundaryPoints(END_TO_END, constraint) >= 0) return constraint.toString().length; // at or after the end
if (rng.compareBoundaryPoints(START_TO_END, constraint) <= 0) return 0;
rng = rng.cloneRange(); // don't change the original
rng.setStart(constraint.startContainer, constraint.startOffset); // they now start at the same place
return rng.toString().length;
}
function NothingRange() {}
NothingRange.prototype = new Range();
NothingRange.prototype._nativeRange = function (bounds) {
return bounds || [0, this.length()];
};
NothingRange.prototype._nativeSelect = function (rng) { // do nothing
};
NothingRange.prototype._nativeSelection = function () {
return [0, 0];
};
NothingRange.prototype._nativeGetText = function (rng) {
return this._el[this._textProp].substring(rng[0], rng[1]);
};
NothingRange.prototype._nativeSetText = function (text, rng) {
var val = this._el[this._textProp];
this._el[this._textProp] = val.substring(0, rng[0]) + text + val.substring(rng[1]);
};
NothingRange.prototype._nativeEOL = function () {
this.text('\n');
};
})();