I can input
0 but not 0123. How do I prevent users not to input 0 at the first position of the input text field?
Let them input it, just trim it when focus changes:
inputElement.onblur = function() {
this.value = this.value.replace(/^0+(?=\d)/,'');
}
Note that it's specifically looking for a digit (\d) after the 0's that it's nuking, so it won't touch the zero in something like 0.123. If you want to get rid of those, too, just change the \d to ., which matches any character whatsoever.
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