Here's a variation on action-setfield. You call it almost the same:
action-setfield-inc. The difference is that if there is a +value field, it
will use that instead of $value and will ADD it to the existing specified
field of the specified tiddler. I've only briefly tested it. Consider it
"alpha" and be sure to make a back-up of your files before playing with it.
Example:
<$button>
<$action-setfield-inc $tiddler="ActionSetValueTarget" $field="increment"
+value="2" />
<$action-navigate $to="$:/ControlPanel"/>
Go to Control Panel "Appearance" tab
</$button>
This will let you save and count by two every time you click the button
into field "increment" (previously created) of tiddler ActionSetValueTarget
(previously created).
Mark
/*\
title: $:/mars/widgets/action-setfield-inc.js
type: application/javascript
module-type: widget
Action widget to set a single field or index on a tiddler.
PLUS ANY OTHERS SPECIFIED (per the actual code)
If inc value specified then that value will be used to increment value
found in field of tiddler.
and value will be ignore.
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
var Widget = require("$:/core/modules/widgets/widget.js").widget;
var ActionSetFieldPlusWidget = function(parseTreeNode,options) {
this.initialise(parseTreeNode,options);
};
/*
Inherit from the base widget class
*/
ActionSetFieldPlusWidget.prototype = new Widget();
/*
Render this widget into the DOM
*/
ActionSetFieldPlusWidget.prototype.render = function(parent,nextSibling) {
this.computeAttributes();
this.execute();
};
/*
Compute the internal state of the widget
*/
ActionSetFieldPlusWidget.prototype.execute = function() {
this.actionTiddler =
this.getAttribute("$tiddler",this.getVariable("currentTiddler"));
this.actionField = this.getAttribute("$field");
this.actionIndex = this.getAttribute("$index");
this.actionValue = this.getAttribute("$value");
this.actionValuePlus = this.getAttribute("+value") ;
};
/*
Refresh the widget by ensuring our attributes are up to date
*/
ActionSetFieldPlusWidget.prototype.refresh = function(changedTiddlers) {
var changedAttributes = this.computeAttributes();
if(changedAttributes["$tiddler"] || changedAttributes["$field"] ||
changedAttributes["$index"] || changedAttributes["$value"] ||
changedAttributes["+value"] )
{
this.refreshSelf();
return true;
}
return this.refreshChildren(changedTiddlers);
};
/*
Invoke the action associated with this widget
*/
ActionSetFieldPlusWidget.prototype.invokeAction =
function(triggeringWidget,event) {
var self = this;
var actionval = this.actionValue ;
if(typeof this.actionValuePlus === "string") {
actionval = Number(this.actionValuePlus) ;
var fv = this.getFieldVal() ;
//alert("I just fetched value from tiddler/field
"+this.actionTiddler+"/"+this.actionField+": " + fv) ;
fv = (typeof fv === "string") ? Number(fv) : 0 ;
//alert("I think actionval before adding is: "+actionval) ;
actionval = actionval + fv ;
actionval = actionval.toString() ;
//alert("I think actionval after adding and toString is: " + actionval) ;
}
if(typeof actionval === "string") {
this.wiki.setText(this.actionTiddler,this.actionField,this.actionIndex,actionval);
}
$tw.utils.each(this.attributes,function(attribute,name) {
if(name.charAt(0) !== "$" && name.charAt(0) !== "+" ) {
self.wiki.setText(self.actionTiddler,name,undefined,attribute);
}
});
return true; // Action was invoked
};
ActionSetFieldPlusWidget.prototype.getFieldVal = function() {
// Get the edit value
var tiddler = this.wiki.getTiddler(this.actionTiddler);
if(tiddler) {
//alert("I found a tiddler") ;
// If we've got a tiddler, the value to display is the field
string value
return tiddler.getFieldString(this.actionField);
} else {
return "" ;
}
};
//(setq tab-width 2) ;
exports["action-setfield-inc"] = ActionSetFieldPlusWidget;
})();
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