Restricting character limit to 500 using client script

developer18 · ‎01-14-2021

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 - · ‎01-14-2021

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!

I hope this helps!
Michael D. Jones
Proud member of the GlideFast Consulting Team!

View solution in original post

Harsh Vardhan · ‎01-14-2021

use g_form.getValue() instead g_form.getControl()

Eg:

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

var control = g_form.getValue('u_observation');
if (control.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');
}
}

developer18 · ‎01-14-2021

Thanks for reply Harsh,

i just tried it.. even same after clicking outside alert showing and its not deleting rest of characters also

Harsh Vardhan · ‎01-14-2021

are you getting alert() correctly ?

to set the value, you have to use g_form.setValue('field name',result 😞

Harsh Vardhan · ‎01-14-2021

Here this is what i have tried. just to show 2 char