Jquery/Javascript get id of a textbox using the id of another textbox

Question

I want to use a jQuery/JavaScript function to validate the input of a textbox.

I have pairs of checkboxes like this:

<input type="text" id="MinMondayTxt" />
<input type="text" id="MondayTxt" />

this is for each day of the week (MinTuesdatTxt, MinWednesdayTxt...)

The Function is like this:

function ValidateTxt(TxtId){
}

It take the Id of a textbox as input. What I want to do is the following:

1) Check if the Id starts with "Min"

2) Get the corresponding textbox, by removing "Min" from the id. for example if we have MinMondayTxt I want to remove the "Min" in order to access the MondayTxt textbox

3) Compare the the values of the 2 textboxes (all values are numeric)

4) if MinMondayTxt > MondayTxt Alert the user

I am looking for help for step 1) and 2) : How can I check if the id starts with "Min" and how to get the corresponding textbox id (by removing the min)

Pranay Rana · Accepted Answer · 2012-05-14 07:58:57Z

2

You can use replace() method with the #id selector of jquery as below

function ValidateTxt(TxtId){ 
 var withoutminid = TxtId.replace(/^Min/, '');

 var withouminidval = $('#' + withoutminid).val();
 var minidval = $('#' + TxtId).val();
}

answered May 14, 2012 at 7:58

Pranay Rana

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1 Comment

Y2theZ Over a year ago

Thank you for your answer. Can you tell me how to check if TxtId starts with Min, before replacing? because sometimes the function is called for textboxes that does not start with "Min" and I don't want to do anything for them

Amadan · Accepted Answer · 2012-05-14 07:57:45Z

1

This will remove "Min" if present, then fetch the jQuery object:

$('#' + TxtId.replace(/^Min/, ''))

answered May 14, 2012 at 7:57

Amadan

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1 Comment

moribvndvs Over a year ago

Missing the initial '#' for an ID selector.

Pranay Rana · Accepted Answer · 2012-05-14 08:03:11Z

1

maybe you could try with split:

txtId.split('Min');

if Min exist it should create an array like that :

array = ["Min","MondayTxt"];

then you just have to use array[1].

edited May 14, 2012 at 8:03

Pranay Rana

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answered May 14, 2012 at 8:02

jbduzan

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