What is the difference between frm.set.value and a simple `=` operator?

#1

Using custom script to change the value of a field in child table based on some value.

I tried doing this in a child table script:
frm.set.value(cdt, cdn, 'field', someVariable);
It doesn’t work and returns an error in the console.

But if I use this:
table.field = someVariable; where table is the locals[cdt][cdn] object, it works fine.

I don’t get the difference. Can someone help explain?

#2

If you get an error, it’s always very helpful to post it. Just looking at what you’ve got here, one problem is that the method is actually set_value, not set.value.

Generally speaking, using set_value is preferable because it triggers event hooks for the field change. If you just set the locals variable, you won’t.

#3

Got it thanks for the tip. I just made a typo. I meant frm.set_value. I get an error Uncaught (in promise) frm.set_value.

image

frappe.ui.form.on('Sales Invoice Item', {
  childTableField:function(frm, cdt, cdn){
    let obj = locals[cdt][cdn];
    // frm.set_value(cdt, cdn, 'fieldToUpdate', `string value`) // this doesn't work
    obj.field= 'string value'; // this works
    refresh_field('obj');
  }
});
#4

Use
frappe.model.set_value(cdt, cdn, ‘fieldToUpdate’, string value)

Set_value triggers field change event

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