Javascript onBlur prefix negative sign
How do I开发者_JAVA技巧 prefix a - sign for all the values entered in a textbox in javascript onblur
First, you'll need to add the event handler. Once you do that, this is your function:
function textBoxBlur(e) {
var evt = e || window.event;
var tb = evt.target || evt.srcElement
if (tb.value.indexOf('-') === -1) {
tb.value = '-' + tb.value;
}
}
Usign jquery you can:
$(selector).blur(function (){
$(this).val("-" +$(this).val());
});
With bare javascript is easy too:
document.getElementById("a").onblur = function (){
this.value = "-" + this.value;
}
Don't forget to bind this events after window loads.
window.onload = function (){
/* here */
}
If you use jQuery, which I highly recommend, you can:
$('#id-of-textbox').bind('blur', function() {
$(this).val('-' + $(this).val());
});
Put this in a <script>
tag at the end of your html.
With jQuery you can now add this functionality to any textbox you want this behavior. Go http://jquery.com/ for more info.
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