Using for loop to change object references - Javascript

Question

    function calcul() {
        salaire = window.parseInt(document.myForm.txtSalaire.value);
        temps = window.parseInt(document.myForm.txtTemps.value);
        for (i = 0; i < monnaie.length; i++) {
            profit = monnaie[i] - (salaire/DIVISEUR) * temps;
            profit = profit.toFixed(3);
            document.myForm.txtMonnaie[i].value = monnaie[i] + "$";
            document.myForm.txtProfit[i].value = profit;
        }
    }
... <input type="text" name="txtMonnaie0"/>

I want to run through all my inputs to set new values to 'name="txtMonnaie[]"' and txtProfit[] using i as the parameter.

myForm.txtMonnaie is undefined.

You can't access DOM properties before you define them in your markup (i.e., put that script to the bottom of your body element) — Marcel Korpel
– Marcel Korpel, Commented Feb 6, 2013 at 16:59

Viktor S. · Accepted Answer · 2013-02-06 16:57:06Z

1

Change:

 document.myForm.txtMonnaie[i].value = monnaie[i] + "$";
 document.myForm.txtProfit[i].value = profit;

To

 document.myForm["txtMonnaie" + i].value = monnaie[i] + "$";
 document.myForm["txtProfit" +i].value = profit;

If you have multiple elements with names like txtProfit0, txtProfit1, txtProfit2, ... browser will not create an array with name txtProfit in document.myForm. There you will find just a list of properties like document.myForm.txtProfit0, document.myForm.txtProfit1 ... and you can access them using index, just like it is shown above

answered Feb 6, 2013 at 16:57

Viktor S.

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