How should i get some value from javascript object and check for null

I am getting the element as

   var minPricePerInputField = $("input#A"+indexNr);

The element can be prese开发者_StackOverflow中文版nt also or not also. I am getting some [object Object] thing. I have no idea what is this. I am receiving this [object Object] when the element is not there.

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Use

if(   $(minPricePerInputField).length === 0);

means null. no element for that selector.

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You are recieveng jQuery object. When there's no such an element, the length property of the recieved object will be 0.

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[object Object] is the default toString() of an Object.

When the Object is used in a String context, the toString() is called implicitly.

Whether jQuery matched 0 or more elements won't affect the toString().

jsFiddle.

You can check the length property to check if the selector matched any elements.

jsFiddle.

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to get the value of an object.. use object.property

Best way: using jQuery ...see the data by console.log(minPricePerInputField)

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var minPricePerInputField = $("input#A"+indexNr);

if(minPricePerInputField.size()==1)
{
   //element exists do something
}

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if($("input#A"+indexNr).length == 1){
      alert("Im present");
    }

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you can check count of selected element count.

var minPricePerInputField = $("input#A"+indexNr);
if(minPricePerInputField.length == 0){
   return;
}