Select an Entry or Add a New One ComboBox: Difference between revisions

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[[Category:HowTo]]<br />[[Category:snippets]]
[[Category:HowTo]]
 
[[Category:snippets]]
= How to select a specific text entry (or add it if does not exist) in a combo box =
The following method acts on a combo box searching for a specified text string and:
 
* if the string is present select it
The following method acts on a combo box searching for a specified text string and:<br />* if the string is present select it<br />* if the string is not present add it to the combo box model
* if the string is not present add it to the combo box model


In the following piece of code ''myText'' is the QString searched for and ''combo'' is a reference to the combo box.
In the following piece of code ''myText'' is the QString searched for and ''combo'' is a reference to the combo box.


<code> bool found = false;<br /> for( int i = 0; i &lt; combo-&gt;count() &amp;&amp; ! found ; i++ )<br /> if( combo-&gt;itemText( i ) == myText ){<br /> combo-&gt;setCurrentIndex( i );<br /> found = true;<br /> }
<code>
 
bool found = false;
if( ! found ){<br /> int index = combo-&gt;count();<br /> combo-&gt;addItem( myText );
for( int i = 0; i < combo->count() && ! found ; i++ ) {
 
if( combo->itemText( i ) == myText ) {
combo-&gt;setCurrentIndex( index );
  combo->setCurrentIndex( i );
  found = true;
}
}
if (!found ) {
int index = combo->count();
combo->addItem( myText );
}
combo->setCurrentIndex( index );
</code>

Latest revision as of 14:20, 24 March 2016

The following method acts on a combo box searching for a specified text string and:

  • if the string is present select it
  • if the string is not present add it to the combo box model

In the following piece of code myText is the QString searched for and combo is a reference to the combo box. 

bool found = false;
for( int i = 0; i < combo->count() && ! found ; i++ ) {
 if( combo->itemText( i ) == myText ) {
  combo->setCurrentIndex( i );
  found = true;
 }
}
if (!found ) {
 int index = combo->count();
 combo->addItem( myText );
}
combo->setCurrentIndex( index );
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