Changing the emptyText of a TextField dynamically in ExtJS4

Is there a way to dynamically change the empty text field in my textfield?

So far, I've attempted the following:

myTextField.emptyText = 'new empty text';

myTextField.emptyText = 'new empty text';
myTextField.applyEmptyText();

myTextField.emptyText = ['new empty text'];

myTextField.emptyText = ['new empty text'];
myTextField.applyEmptyText();

Although applyEmptyText() is not documented in the API, I decided to try it since it has worked in previous versions. Some sources suggest using brackets as well.

After printing out myTextField in the console, I can see that the emptyText property reflects the desired changes. However, the actual textfield in the browser does not update accordingly.

javascriptextjs4

Answer №1

While I am a big fan of ExtJS and all its features, there are certain nuances that can really hinder development progress. One particular issue I encountered was trying to get dynamically updated emptyText to work, which proved to be quite challenging. Despite looking through various Stack Overflow posts, none of the solutions provided seemed to solve the problem of the emptyText not updating.

After spending several hours tinkering with my code and trying out numerous approaches, I eventually stumbled upon a simple fix. All it took was adding myTextField.reset(); in my code block.

myTextField.emptyText = 'new empty text';
myTextField.applyEmptyText();
myTextField.reset();

I hope sharing this solution will help others save time and avoid getting stuck on this issue.

Answer №2

It is crucial to ensure that the specified criteria are met before the placeholder is effectively set, as indicated by your initial attempt. To troubleshoot any issues that may arise, consider inserting a breakpoint within the applyEmptyText function and conduct debugging.

applyEmptyText : function(){
    var me = this,
        emptyText = me.emptyText,
        isEmpty;

    if (me.rendered && emptyText) {
        isEmpty = me.getRawValue().length < 1 && !me.hasFocus;

        if (Ext.supports.Placeholder) {
            me.inputEl.dom.placeholder = emptyText;
        } else if (isEmpty) {
            me.setRawValue(emptyText);
            me.valueContainsPlaceholder = true;
        }

        //all browsers need this because of a styling issue with chrome + placeholders.
        //the text isnt vertically aligned when empty (and using the placeholder)
        if (isEmpty) {
            me.inputEl.addCls(me.emptyCls);
        }

        me.autoSize();
    }
}

Answer №3

After extensive debugging, it was evident that the Text.inputEl.dom.placeholder attribute was not being assigned in a timely manner during the event, leading to issues with updating the field. Referencing the provided code for reset, I discovered that simply setting the Text.inputEl.dom.placeholder within my own code resolved the problem.

Answer №4

This method called applyEmptyText has some serious bugs!

Take a close look at the code, if you wanted to use zero as empty text....

Consider this if statement:

if (me.rendered && emptyText)

When emptyText is set to 0, it will be incorrectly interpreted as false in the condition.... making it impossible to actually set zero as emptyText with this code!!!

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