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adding data to a confirmation dialog

I have this dialog function in which it asks "add(the inputted amoun)?"

In my code i used this ("Add " + amntDATA + " ?") . but this is the outcome

Add [object HTMLInputElement] ?

html code:

 Amount: <input type="text" name="contriamnt" id="contriamnt" size="15" placeholder=" Amount"></br></br>
 <button id="searchbutton" type="submit" name="submit" value="Submit">ADD</button></br>

script:

 function ConfirmFunction() {
        var amntDATA = document.contribution.contriamnt; 
        if (confirm("Add " + amntDATA + " ?") == true) {
            return true;
        } else {
            return false;
        }
    }

amntDATA is just an input element. You need to get the value of the amntDATA element, get it like:

function ConfirmFunction() {
        var amntDATA = document.contribution.contriamnt; 
        if (confirm("Add " + amntDATA.value + " ?") == true) {
            return true;
        } else {
            return false;
        }
}

Just use java script property .value
eg amntDATA.value;

function ConfirmFunction() {
    var amntDATA = document.contribution.contriamnt; 
    if (confirm("Add " + amntDATA.value + " ?") == true) {
       return true;
    } else {
       return false;
    }
}

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