Input box filters non-numeric js code_javascript skills
HTML:
JS:
window.onload=function(e){ var text=document.getElementById("only"),pattern=/\d/,//pattern匹配字母上的数字键 pattern2=/(9[6-9])|(10[0-5])|3(7|9)/,//pattern2匹配小键盘上的数字键和左右方向键 EventHandle={},event=e||window.event;//一个处理事件的对象 //当网页加载的时候,进行判断,对事件处理对象进行定义属性,这样对事件对象的方法只需要进行一次判断,以后的其他事件 //处理程序里面不需要判断 if(event.preventDefault){ EventHandle.preventDefault=function(e){ e.preventDefault(); }; }else{ EventHandle.preventDefault=function(e){ e.returnValue=false; } } text.onkeydown=function(e){ var event=e||window.event;//不同事件的事件对象不一样,这个event和最前面的event不相等 if(!pattern.test(String.fromCharCode(event.keyCode))&&event.keyCode!=8//keyCode=8是退格键,因为可以对输入的数字进行修改,所以退格和左右方向键不禁止 &&!pattern2.test(event.keyCode.toString())||event.shiftKey|| event.ctrlKey||event.metaKey){ EventHandle.preventDefault(event);//如果不用对象的这个方法,写成下面这样,也可以执行,不过每次按下键盘的时候都会进行一次判断 //这个是没有必要的,所以在页面加载的时候对事件处理对象定义一个方法,加载后对象的方法就已经是确定的了,以后时候就可以了 //if(event.preventDefault){ //event.preventDefault(); //}else{ //event.returnValue=false; //} } } }
Uncommented version:
window.onload=function(e){ var text=document.getElementById("only"),pattern=/\d/, pattern2=/(9[6-9])|(10[0-5])|3(7|9)/, EventHandle={},event=e||window.event; if(event.preventDefault){ EventHandle.preventDefault=function(e){ e.preventDefault(); }; }else{ EventHandle.preventDefault=function(e){ e.returnValue=false; } } text.onkeydown=function(e){ var event=e||window.event; if(!pattern.test(String.fromCharCode(event.keyCode))&&event.keyCode!=8 &&!pattern2.test(event.keyCode.toString())||event.shiftKey|| event.ctrlKey||event.metaKey){ EventHandle.preventDefault(event); } } }
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