I. Overview
1.1 Requirement
Generally, data containing alphabets, such as numbers and codes, is stored in upper case in the database.
When querying these numbers, users may type lower cases accidentally, resulting in query failures, so some clients wish that Text widgets could automatically convert lower cases they have typed into upper cases.
1.2 Solution
Method 1: Text can be converted into upper cases through toUpperCase() designed for strings in JavaScript. Despite some delay, this method supports mobile terminals.
Method 2: keypress() in jQuery can be used to monitor Keyboard Press events of an object and convert characters to be typed into upper cases before splicing them into a Text widget. This method is fast and delay-free, but is not available on mobile terminals.
II. Sample
2.1 Method 1
Add an After Editing event to the Text widget, as shown below:
Input the following JavaScript codes:
this.setValue(this.getValue().toUpperCase())
The effect is shown below:
2.2 Method 2
Add an After Initialization event to the Text widget, as shown below:
Input the following JavaScript codes:
var $edit = $(this);var self = this;$edit.keypress(function(e) {
var value = self.getValue();
if(e.key >= 'a' && e.key <= 'z') {
e.key = e.key.toUpperCase();
$(this).val(value + e.key);
return false;
}
})
The effect is shown below. Lower cases typed in the Text widget are by default converted into upper cases without any delay.
In practical application, Method 2 is recommended if there is no need for conversion into upper cases on mobile terminals.
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