Cannot read property '0' of null

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Posted on by Community Member

Hello,

I am trying to hide a tab on the form if the segmantid lookup is equal to "Hospitals". When the lookup value is null i get the following error : Cannot read property '0' of null at hideTab

How can i fix this?

Thanks

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Verified answer

JohnAnonymous 5,241 on at

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I would think it's this line: segment[0].name

You need to check if segment contains any objects before you pick the first one of the list.

Tip: place a debugger on the second line and you can check for yourself with debugging in the browser.

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Verified answer

Radu Chiribelea 6,667 on at

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Hi Nexius,

When the segmentid is null then following line of code var segment = Xrm.Page.getAttribute("segmentid").getValue(); will return a null, hence causing if (segment[0].name == "Hospitals") to throw the error. Because we are trying to access an item of a null array.

I suggest you add an extra validation before. Something like

if (segment != null && segment[0].name == "Hospitals")

Hope this helps

Radu

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a33ik 84,331 Most Valuable Professional on at

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Hello,

Try following code:

function hideTab() {

Xrm.Page.ui.tabs.get("tab_2").setVisible(false);

var segment = Xrm.Page.getAttribute("segmentid").getValue();

if (segment == null || segment.length == 0){

Xrm.Page.ui.tabs.get("tab_2").setVisible(false);

}

else if (segment[0].name == "Hospitals") {

Xrm.Page.ui.tabs.get("tab_2").setVisible(true);

}

else {

Xrm.Page.ui.tabs.get("tab_2").setVisible(false);

}

}

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