behavior-transaction-preview.js
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	/**
	* @provides javelin-behavior-maniphest-transaction-preview
	* @requires javelin-behavior
	* javelin-dom
	* javelin-util
	* javelin-json
	* javelin-stratcom
	* phabricator-shaped-request
	*/

	JX.behavior('maniphest-transaction-preview', function(config) {

	var comments = JX.$(config.comments);
	var action = JX.$(config.action);

	var callback = function(r) {
	JX.DOM.setContent(JX.$(config.preview), JX.$H(r));
	};

	var getdata = function() {
	var selected = action.value;

	var value = null;
	try {
	var control = JX.$(config.map[selected]);
	var input = ([]
	.concat(JX.DOM.scry(control, 'select'))
	.concat(JX.DOM.scry(control, 'input')))[0];
	if (JX.DOM.isType(input, 'input')) {
	// Avoid reading 'value'(s) out of the tokenizer free text input.
	if (input.type != 'hidden') {
	value = null;
	// Get the tokenizer and all that delicious data
	} else {
	var tokenizer_dom = JX.$(config.tokenizers[selected].id);
	var tokenizer = JX.Stratcom.getData(tokenizer_dom).tokenizer;
	value = JX.JSON.stringify(JX.keys(tokenizer.getTokens()));
	}
	} else {
	value = input.value;
	}
	} catch (_ignored_) {
	// Ignored.
	}

	return {
	comments : comments.value,
	action : selected,
	value : value \|\| ''
	};
	};

	var request = new JX.PhabricatorShapedRequest(config.uri, callback, getdata);
	var trigger = JX.bind(request, request.trigger);

	JX.DOM.listen(comments, 'keydown', null, trigger);
	JX.DOM.listen(action, 'change', null, trigger);

	request.start();
	});