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Set Contact Form field value from javascript

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Hi to all! I'm trying to set a value in a contact form field, but I'm having troubles.

In facts, it seems that I can set the value, with this instruction:


I see the value in the textbox changing, but when I press the button to send the form, the value disappear. It seems that I'm not changing the real field, but a sort of link of it. 

How can I really set the value of the field? Is it possible?

thanks a lot


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40 minutes ago, StefanoM2 said:

I'm trying to set a value in a contact form field, but I'm having troubles. It seems that I'm not changing the real field, but a sort of link of it.

Form Blocks are now built using React. In React, for every DOM object, there is a corresponding virtual DOM object so, as you mentioned, changing the DOM won't change the form itself. To do this, you'll need to tell React that there's been a change. See earlier threads for more background. 

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Thank you for your prompt reply ... I tried the code, everything seems correct, via "console.log" I see correct values, the field doesn't change until a "human" enter value manually in the field.

I think I understood the example of codepen:


and it works, but in squarespace form it doesn't. Any ideas?

At least, what I'm trying to do is simply trap 2 additional controls in a form, for example: range of dates, range of hours. I'm not able to "prevent" the form submission in any way (button is not "prevantable"), so I was trying to have a hidden field mandatory, to fill with a value only when my custom controls are ok. That's quite simple, but squarespace doesn't permit me to customify almost nothing 😞

If you have any ideas and / or advices i would appreciate very much.






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