API Only for Drop-down Box Widget

Example 1: If the obtained drop-down box widget object is defined as combo, change the default text of the drop-down box to "Select all"

combo.setName4Empty("Select all");

Example 2: In a general report, change the default text of the drop-down box comboBox0 in the parameter pane to "Select all"

_g().getParameterContainer().getWidgetByName("comboBox0").setName4Empty(
"Select all");

Example 3: Dashboard, change the default text of the drop-down box comboBox0 in the body to "Select all"

_g().getWidgetByName("comboBox0").setName4Empty("Select all");

Note: After adding an event, after an error is reported because the report block object is not completely created, you can add a delay function to delay execution, such as:

setTimeout(function(){
    _g().getParameterContainer().getWidgetByName("comboBox0").setName4Empty(
"Select all");
}, 500);

Click to download the template: 

Modify the default select all in the drop-down box.cpt