如何根据php中前一个输入的值限制在文本框中输入的值

Question

I have 2 textboxes one is for maximum marks and the other for the obtained marks.. The value to be entered in the second box must be restricted in such a way that it is less than or equal to the maximum marks.. Only numbers must be entered into those boxes..

Maximum Marks<input type=text name=maxmarks maxlength='2' >
Obtained marks<input type='text' maxlength='2' name='obtmarks'>

Please help me with this.. Thank you in advance..

Answer 1

Well if you want to do it client side, you will have to use Javascript. If you want to do it server-side, why don't you send them back the page with an error message if the second number exceeds the first. You might also might want to look into HTML5 input options if that is an available option for you. Those will automatically do the number validation.