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<input id="Text1" type="text" class="jk-input"
oninput="this.value=this.value.replace(/[^-\d\.]/ig,'')"
onkeypress ="return IsNum(event)" value="" />
<script type="text/javascript">
function IsNum(e) {
if(/(\d|\.|-|(Backspace))/ig.test(e.key)){
if(e.target.value){
var ckvalue=e.target.value;
if(e.key!="Backspace")ckvalue+=e.key;
return /^-?(\d*)(\.?)(\d{0,3})?$/g.test(ckvalue)
}
return true;
}
return false;
}
</script>