如何改变 <select> ng-model中的默认值是可以激活ng-change中的功能的更改？

Question

<select name="BF_base_type" id="BF_base_type" 
style="display:inline height:20px;" 
ng-model="BF_base_type"  
ng-change="activateDiv('Model_BF','BF_base_type')" 
ng-options="start.value as start.name for start in startOptions"> </select>

In above , there is default value ="BF_base_type" for the selection given by ng-model. There is a function for ng-change, which will activate once there is a change happened to the selection.

What I wanted to have is to activate ng-change function by checking the default value for the selection specified by ng-model, no matter there is change or not by user interaction.

For example. By default, BF_base_type is empty or not defined. So is empty. Upon user's interaction, BF_base_type will be assigned a non-empty value. By observation, assigning a non-empty value to BF_base_type would not activate the function associated to ng-change.

How can I activate the function associated to ng-change for changing the value of the variable (BF_base_type in this case) assigned to ng-model from one (empty or null) to another (non-empty, none)?

Thanks...

Answer 1

Add a ng-init line to trigger it at the beginning:

<select name="BF_base_type" id="BF_base_type" 
style="display:inline height:20px;" 
ng-model="BF_base_type"  
ng-change= "activateDiv('Model_BF', BF_base_type)"
ng-init  = "activateDiv('Model_BF', BF_base_type)"
ng-options="start.value as start.name for start in startOptions"> </select>

By the way do you really want the quotes around BF_base_type in your ng-change ? If you do so you'll get the string, without them you'll get the value.