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Array Item Check

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Apr 09.2004

My Challenge…

When the user enters the page I initialize two arrays,

invArray{num:”none” name:”none” qty:”none”};
nameArray{num:”1″ name:”couch”, num:”2″ name:”sofa”}; (and so on for 100 items)

Then everytime a user completes three text boxes, I grab the info and feed it to the invArray.

txtA is an itemNumber
txtB is an itemName
txtC is an itemQty

after a user leaves txtA for txtB I search nameArray and prefill the txtB with the appropriate name.

At the same time I want to search invArray to see if that item number exists already. If it does, I want to grab it and populate the txtC with the qty. Problem is that I cannot figure out how to get around an item not existing in invArray.

Thoughts?

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JavaScript

2 Comments(s) ↴

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@Khalid_AliApr 09.2004 — ?

typically when you try to access an element thats not initialised in an array you will get an "undefined" error....so my point is please explain the question abit more..
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@ianjkingauthorApr 09.2004 — Well,

Instead of looking directly at an itemNum that may or may not exist in the array...

i.e. itemQty = invArray[itemNum].qty

I decided to use a for loop and if statements to first determine if it exists.

for(var x = 0; x < invArray.length; ++x){

if(itemNum == invArray[x].num){

itemQty = invArray[x].qty

} else {

itemQty = "";

}

}

This got the code working, not sure if there was a simpler or more direct/efficient way to write it or not to get the desired results.

Thanks!
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