How can we refresh the DOM in AngularJS once a hidden panel becomes visible?

Currently, I am utilizing the AngularJS range slider directive created by prajwalkman. The slider functions properly when it is visible; however, an issue arises when it is placed within a hidden options screen using ng-show. This prevents the DOM manipulation from functioning correctly due to the utilization of "offsetWidth". My setup involves these sliders being integrated into a panel that remains hidden upon initial launch, yet I still want the sliders to be initialized so that the pointers are positioned accurately and the colored selection bar is visible once the user toggles the panel.

wholeBar = element.children()[0].offsetWidth;

When the element is concealed, offsetWidth returns 0 causing errors in the calculations. It seems like the solution may involve displaying the panel first, then executing the DOM update code after the current apply/digest cycle concludes. However, I have not yet determined how to schedule this operation accordingly.

To demonstrate the issue, I have created a simplified fiddle - when the DIV is visible, the code works as expected because offsetWidth is not 0. Yet, when it is hidden, the selection bar fails to expand to 50%.

javascriptangularjs

Answer №1

One approach suggested in the comments is to utilize a class that moves the slider out of sight, essentially 'hiding' it.

Check out the updated fiddle here

This was achieved by implementing a toggle function for the hide/show button using a variable

<button ng-init="move=false" ng-click="move=!move">Show/Hide DIV</button>

A specific class was created to shift the element off-screen

.move {
  transform: translate(-9999px, 0);
}

The ng-class directive was then used to apply this class when toggling the button

<div ng-class="{move: move}" my-component>
    <h3>This is my hidden DIV</h3>

    <div style="height:20px; width:100%; background-color:red; zindex=0; ">
        <div style="height:35px; width:15px; background-color:blue; zindex=1; position:absolute"></div>
    </div>
</div>

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