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Code Issues Releases Wiki Activity

Extend set variable widget to work with filters

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Jermolene 2014-11-13 21:39:15 +00:00
parent fdc272bff4
commit bd211ea082
2 changed files with 71 additions and 2 deletions
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16
core/modules/widgets/setvariable.js
View File

@ -39,9 +39,21 @@ Compute the internal state of the widget
SetWidget.prototype.execute = function() {
// Get our parameters
this.setName = this.getAttribute("name","currentTiddler");
this.setFilter = this.getAttribute("filter");
this.setValue = this.getAttribute("value");
this.setEmptyValue = this.getAttribute("emptyValue");
// Set context variable
this.setVariable(this.setName,this.setValue,this.parseTreeNode.params);
var value = this.setValue;
if(this.setFilter) {
var results = this.wiki.filterTiddlers(this.setFilter,this);
if(!this.setValue) {
value = $tw.utils.stringifyList(results);
}
if(results.length === 0 && this.setEmptyValue !== undefined) {
value = this.setEmptyValue;
}
}
this.setVariable(this.setName,value,this.parseTreeNode.params);
// Construct the child widgets
this.makeChildWidgets();
};
@ -51,7 +63,7 @@ Selectively refreshes the widget if needed. Returns true if the widget or any of
*/
SetWidget.prototype.refresh = function(changedTiddlers) {
var changedAttributes = this.computeAttributes();
if(changedAttributes.name || changedAttributes.value) {
if(changedAttributes.name || changedAttributes.filter || changedAttributes.value || changedAttributes.emptyValue) {
this.refreshSelf();
return true;
} else {

57
editions/prerelease/tiddlers/SetWidget.tid Normal file
View File

@ -0,0 +1,57 @@
title: SetWidget
created: 201311151827
modified: 20141113212520422
tags: Widgets
caption: set
! Introduction
The set variable widget assigns a value to a specified [[variable|WidgetVariables]]. The new value of the variable is availale to the content within the set variable widget.
! Content and Attributes
The content of the `<$set>` widget is the scope for the value assigned to the variable.
|!Attribute |!Description |
|name |The name of the variable to assign (defaults to "currentTiddler") |
|value |The value to assign to the variable if the filter is missing or not empty |
|filter |An optional filter to be evaluated and assigned to the variable (see below) |
|emptyValue |The value to assign to the variable if the filter is present and evaluates to an empty list (see below) |
!! Simple Variable Assignment
The simplest way of using set variable widget assigns a string to a variable. The following example assigns a literal string
```
<$set name="myVariable" value="Some text">
<<myVariable>>
</$set>
```
Both the name and value attributes can be transcluded. For example:
```
<$set name=<<anotherVariable>> value={{template!!text}}>
<<myVariable>>
</$set>
```
!! Conditional Variable Assignment
This form of the set variable widget chooses one of two specified values according to whether a filter evaluates to an empty list. Here's an example that sets a variable according to whether the current tiddler is called "myMagicTitle":
```
<$set name="myVariable" filter="[all[current]field:title[myMagicTitle]]" value="It's magic" emptyValue="It's not magic">
<<myVariable>>
</$set>
```
!! Filtered List Variable Assignment
This form of the set variable widget evaluates the filter and assigns the result to the variable as a space-separated list (using double square brackets for titles containing spaces).
```
<$set name="myVariable" filter="[tag[Introduction]]">
<<myVariable>>
</$set>
```