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Java - If field left blank


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I would like to input a default--"NONE"--into a text field if a user submits a web form with nothing in that field. I assume I need to do this with java script in the footer of the form, but I'm not sure how.

Also, is it possible to do the same thing with a file field? When people view this record, I would like it to say "No File Uploaded" if one was not. Is it easier to do this when the form is submitted or when the field is displayed?

Thanks!

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Does anyone have any idea why this won't work? Please help... been spending almost all day on this. I want the field Job_Comment (which is a long text field) to equal "None" if the user leaves it blank. I have deployed this in the footer of a web form data page.

function job_blank() {

var jobc = document.getElementById("InsertRecordJob_Comment").value;

if (jobc.equals("")) {

document.getElementById("InsertRecordJob_Comment").value="None";

}

}

document.getElementById("caspioform").onsubmit=job_blank;

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