You din’t explained your problem well, but I think this is what you want:
<input id="first" type="text">
<input id="second" type="text">
<button onClick="onClick()">Click me</button>
function onClick(){
var first = parseInt(document.getElementById("first").value);
var second = parseInt(document.getElementById("second").value);
var sum = first + second;
if (sum == 100)
{
...//Your code here...
}
}
Please tell me if this din’t work for you.
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solved Validate two text fields together in html