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Translations of the site may take a while. Free Translation only meant to understand the content and spirit of the site. All credit goes to the source site. Most of the translations are created by Google Translate, sorry for any mistakes and bad language used.Q:
How to validate Select box?
I have a select box. I want to validate it against:
If the user select an option, a text field should be required.
If the user does not select an option, a text field should be required.
Is it possible?
A:
You can make the text field required if the select box is empty (with this CSS property) or you can make the text field required if the select box is selected (with this Javascript event handler).
Select the element, either with the id or class name that is unique to each select box:
And then with Javascript:
$("select").change(function(){
if($(this).val() == ""){
$("#myTextField").removeAttr("required");
}else{
$("#myTextField").attr("required","true");
}
});
See:
Q:
Why is the RecyclerView's view not created by the ViewHolder?
In Android, why is the RecyclerView's view not created by the ViewHolder?
I am creating a recyclerView, and set the view as follows.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = findViewById(R.id.my_recyclerview);
custom_Layout_Manager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(custom_Layout_Manager);
}
The Layout Manager class:
public class CustomLayoutManager extends LinearLayoutManager {
@Override be359ba680
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