Restricting character limit to 500 using client script

[developer18]

Hi All,

I have one Text field in Problem form .

I want to restrict user to enter only 500 characters if its more then it should not allow.

In Max length i have given 500 still its taken more than 500 and its known error in Servicenow

SO i have written on change client script as below

---------------------------------------------------------

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
if (isLoading || newValue === '') {
return;
}

var control = g_form.getControl('u_observation');
if (control.value.length > 500) {
//g_form.hideErrorBox('u_observation');
//g_form.showErrorBox('u_observation', 'You have reached the maximum limit of ' + 500 + ' characters for this field.');
alert('You can not put more than 500 characters to Observation field');
control.value = control.value.substring(0, 500);
} else {
g_form.hideErrorBox('u_observation');
}
}

-------------------------------------

As per onchange once i click outside of field then only alert is popping and characters after 500 getting deleted.

Is there any way i can restrict to enter only?

Regards,

Roopa 

[Michael Jones - · Accepted solution]

This solution still seems to work. 

https://servicenowguru.com/scripting/client-scripts-scripting/maximum-length-large-string-fields-ser...

Something like this in an onload script: 

function onLoad() {
    var control = g_form.getControl('u_observation');
    //Set its onkeyup method
    control.onkeyup = isMaxLength;

}


function isMaxLength() {
    var mLength = 100;
    var control = g_form.getControl('u_observation');
    if (control.value.length > mLength) {
        g_form.hideErrorBox('u_observation');
        g_form.showErrorBox('u_observation', 'You have reached the maximum character limit for this field.');
        control.value = control.value.substring(0, mLength);
    } else {
        g_form.hideErrorBox('u_observation');
    }
}

I hope this helps!

If this was helpful or correct, please be kind and remember to click appropriately!

Michael Jones - Proud member of the CloudPires team!

[developer18]

Thank u so much it works

[hvrdhn88]

the script which i have shown that did not work ?

Note: if you will use getControl() on portal, in future deployment, that will not work.