JSF custom component losing input focus on ajax update - javascript

I'm writing an autocomplete custom component as a learning exercise with JSF
2.1.3. The idea (which is probably pretty familiar) is to enter some text into
and input component and present a list box with matching values. The idea is
to have a keyup javascript event on the input which calls jsf.ajax.request()
to update the component. So far I've got a component which I can include like
this:
<mycc:autocomplete id="myauto" searchMethod="#{bean.doSearch}"/>
This renders html like this:
<span id="myauto">
<input type="text" id="myauto_input" name="myauto_input"
onkeyup="com.myco.ajaxRequest(this, event)"/>
<select id="myauto_listbox" name="myauto_listbox">
<option value="1st">First</option>
<option value="2nd">Second</option>
</select>
</span>
The com.myco.ajaxRequest() javascript function (keyup) does this:
jsf.ajax.request(comp, null, {
execute: 'myauto',
render: 'myauto'
});
So because I want to rebuild and rerender the listbox with the suggestions
list, I'm re-rendering the custom component 'myauto'. By specifying execute:
'myauto' the decode() method executes and I can get the input value. By
specifying render: 'myauto' the encode...() methods execute to regenerate
the html.
This is all fine but because I'm rendering the parent of the myauto_input
component I lose input focus every time the keyup event fires.
If I specify something like render: 'myauto_listbox' (I only really want to
rerender the listbox after all) the problem is that the encode...() methods
don't execute, because they're for the custom component as a whole, not just
the listbox. And it would be in one of the encode...() methods that I rebuild
the listbox containing the suggestions.
The component extends UIInput and I generate markup in a separate renderer
(componentFamily = "javax.faces.Input") in the encodeEnd() method (so this
always runs after any supplied converter - not yet implemented). I suppose
that forcing focus from javascript is a horrible hack and to be avoided.
I'm a bit unsure where to go with this, but I suspect that what I'm seeing
indicates that I'm approaching this in the wrong way somehow. If anyone
would be good enough to point me in the right direction I'd greatly appreciate
it.

I've spent some time looking into this and the general issue of losing focus after
an ajax update is fairly common and is described in Jim Driscoll's blog (see
'Keeping Focus').
In the case of my custom component I (think I...) have to update the custom component
itself which is the parent of the input, so I'm going to lose focus as a result of the
ajax update, and that's just the way it is. As such I've looked at what needs to be
done to restore focus, and it seems that in my renderer encode I simply have to
forcibly restore focus to the input, but only when responding to the POST sent from the onkeyup event by jsf.ajax.request. I use jQuery and just calling .focus() isn't
enough because you also have to get the cursor position to the end of any existing
input. This code below seems to work ok:
<script>
jQuery(function($){var cid='#myauto_input';$(cid).focus().focus().click();$(cid).val($(cid).val());});
</script>
(note: .focus().focus().click() required for IE8, just .focus() works on chrome...)
So it looks like the horrible hack has saved the day. I did wonder if there would be
any difference if I used the jQuery ajax routines rather than the jsf ajax library but
I don't suppose it would make any difference.

Related

How to get the "input" field value inside a EventListener function from DOM in Angular

Inside my "characters" component I have a form with a textfield, and button. ->
When I click the button it registers, and enters the function but I have no idea how to grab the current input text and use it in the called async function.
HTML:
TS:
Sadly getting the promptText does not work. I have the feeling I am missing a core concept of angular here, but even after extensive search, no luck.
Thanks in advance!
You can use
const promptTxt = document.getElementById('prompt-txtbox') as HTMLInputElement;
console.log(promptTxt.value);
Rather than trying to create form with plain javascipt/jquery, you can use Template form and Reactive form that angular provide to do the same.
A lot of example documentation/video in available for the same.
This seems like something you can also achieve by simple model binding but learning the correct way once will prepare you handle complex forms and build them quickly.

Calling function on dropdown AngularJS

I have an interesting scenario happening right now and it's confusing me, this question is initially meant for those who are familiar with Angular UI Grid. However, you are welcome to answer.
I have a UI Grid that I call a drop down through a separate html page in the grid itself because the dropdown values dynamically change. Now I have ng-model of this drop as ng-model="row.entity.someValue" this would be the value of the $scope.someDate.someValue that is obtained from the grid with field: 'someValue'. The issue I'm having at hand is after selection I cannot fire a function call, I'm avoiding id="" calls because I want the code to be consistent and not use getElementById calls. I've tried ng-selected, ng-change even ng-class (knowing it wouldn't work) What I'm trying to do is fire a function with the selected value as a parameter and I cannot get the function to fire. What am I missing here?
Here is a same code of what I'm trying to achieve:
<div>
<select ng-model="row.entity.someValue" class="dropdownWidth" ng-selected="someFunction(selectedValue)" >
<option ng-repeat="selectedValue in grid.appScope.someArray" value={{selectedValue}}>{{selectedValue}}</option>
</select>
</div>
UPDATE Answer below
The answer was right there in front of me, which I keep forgetting. Every time a call to a grid cell is made outside of the controller you always apply grid.appScope in anything thing pertaining to the cell's value
in my case I was just calling ng-selected="someFunction(selectedValue)" when in fact I should've been calling ng-selected="grid.appScope.someFunction(row.entity.someValue)". Now it works perfectly, hopefully this scenario will be of some good use for anyone in the future!

React render, change radio button programmatically

I was creating a Dropdown component for React. Inside the dropdown, I have a form of radio group buttons.
<DropdownButton />
<DropdownForm />
In the DropdownButton, I have an state to know if it is open or not. Depends on that, DropdownForm it's hidden or not (using display: none).
The use case is: User selects a radio button, click apply and something happen. However, if user selects some radio button, and mouse out the dropdown (without clicking the apply button), the one that is selected should be the one that I get from the store.
Something like:
render: function () {
...
if(store.getSomeParam() != this.state.someParam && !this.props.isOpen){
someParam = store.getSomeParam()
}
Then the radio buttons are like:
<input checked={someParam == "something"} ... />
It doesn't really work. It re-renders but it doesn't change the button that is checked. I also tried with refs:
this.refs.myInput.getDOMNode().checked = true
But still nothing. Is this a correct behaviour?
The only solution I found so far is not using a css hiding class (display: none). So what I do is that the DropdownButton renders the DropdownForm depending on if it's open or not (so if you close it, you are forcing DropdownForm to unmount). Then when opening again, it is taking the values from the store (getInitialState) and it shows the correct radio button selected. But, I am not sure if this is the best solution and if there is any drawback in unmounting the component instead of just css hiding it.
This probably has nothing to do with React at all.
Most browsers don't validate the value of the checked attribute, but merely if it is there or not: http://jsfiddle.net/7jzm7gvw/
Just set the checked attribute to either true or null:
<input checked={someParam == "something" ? true: null} ... />
TL;DR: You must use the componentDidMount lifecycle method, not render, to work with the rendered dom nodes directly.
I was struggling with this as well, and after doing some online research I figured I might as well look into it for myself. Here's what I came up with:
Use the componentDidMount lifecycle method and update whatever you need to in there. Here's a Pen I used to prototype this, and I think it looks okay: http://codepen.io/gholts/pen/GpWzdb
You could drop this in pretty easily to what your'e working on by just putting a componentDidMount method on your object and doing it there. I used document.getElementById but you could definitely use jQuery or whatever else you wanted in there, as once the component has mounted it's available to DOM selectors.
I'm using this now to update 20 radio button groups (so it has to check a prop for three different states and update accordingly) and it loads instantly.
Hope it helps! I used the ES6 class syntax in my Pen, you should check it out if you have some time to refactor :) It's fun.
EDIT: So I figured it out, I'm a dummy. You don't need to do the whole document.getElementById business that I was doing. Just use your this.refs.whichever.getDOMNode().checked = true and it'll work, so long as you do it in componentDidMount. It works there because there is an actual DOM element on the page at that point.

Datepicker initialization for class fields added after page load

I have fields where multiple extra fields can be added after the page loads (think education & work experience fields on job resumes). I am using this.
I can add a datepicker on the first field, but subsequent added fields do not access the datepicker, despite being cloned/essential duplicates of the original. I'm guessing that the datepicker only intializes on page load or for only one class on the page.
So on a page I initialize the datepicker:
$('.input-append.date').datepicker();
for a block of form code encapsulated by this class. OK for initial page load; and also OK if there is an error and the page reloads multiple fields previously input(there is a datepicker for all fields returned with any error). However, with another js function that adds new fields to the form, additional new fields do not have access to the datepicker. I do not see how to do this now, perhaps someone with more experience/wisdom can provide me a hint.
EDIT:
Simple enough: I simply added:
$('.input-append.date').datepicker();
to the code calling the new field. As to being the optimal solution I do not know, anyone who specializes in js can comment on that, and there are many other similar questions here I found once I expanded my search terms. However, good enough for me now in what I'm doing.
For elements which are being added on fly use data-provide="datepicker" attribute. It will be initialized lazily. For example if an input field is coming up in an ajax response and loaded in a container div. So in this case:
<input type="text" data-provide="datepicker" />
so when when you will load this ajax response it in cotainer div like
$('#container-div').html(ajax_response);
this will work.
In the same way if you are creating an element through jquery and appending it to some container (I think this is happening in your case), for example you have a function that creates textbox and append it to some container div and this function is called on click event of some element let's say it's button. Again data-provide attribute is the solution to this problem. For example
function createTextBox(){
var t = $('<input>').attr('data-provide','datepicker');
$('#container-div').append(t);
}
And this function is called on click event of some button like in this way:
$(document).ready(function(){
$('#someBtn).click(createTextBox);
});
In short whether that dynamic element is coming in ajax response as a string or being created through jquery, just use data-provide attribute to set bootstrap datepicker. Because in this case datepicker is initialized lazily in Bootstrap fashion.

Knockoutjs ObservableArray Keeps Doubling in Size

I am trying to understand some slightly odd behavior I am seeing in a page I am making using KnockoutJS. An observable array seems to get duplicate items every time I clear and reapply bindings. The quickest way to understand the problem is to look at this JSFiddle demo. Just click any edit button several times, and watch this list grow!
The heart of the code for this demo is in the following method:
var _bindItemDetail = function (jsonData) {
//clear existing bindings
ko.cleanNode($("#itemdetails").get(0));
// observables in selected item.
_viewModel.SelectedItem(ko.mapping.fromJS(jsonData));
// Apply Bindings
ko.applyBindings(_viewModel.SelectedItem, $("#itemdetails").get(0));
};
The essence of what I am trying to achieve is to create a list and details page in one. The list JSON is fetch on initial page load, and the detail JSON is fetched and bound to the "detail" html whenever an edit link is clicked.
In addition to solving the problem, I am trying to understand the behavior, and learn some lessons about how to clean up stale resources properly when using knockout.
Thanks for any help
The problem is that in your _bindItemDetail function, you are reapplying the bindings on your modified view where you already had replicated the elements.
var _bindItemDetail = function (jsonData) {
//clear existing bindings
ko.cleanNode($("#itemdetails").get(0));
// observables in selected item.
_viewModel.SelectedItem(ko.mapping.fromJS(jsonData));
// Apply Bindings
ko.applyBindings(_viewModel.SelectedItem, $("#itemdetails").get(0));
};
ko.cleanNode() merely removes bindings from the elements, it doesn't revert the view back to its initial state. In general, you should only ever call ko.applyBindings on a set of nodes once. Doing it more than once, is just asking for problems.
Frankly you're not really making good use of knockout. The majority of your code is using jquery to handle all the low-level details. The point of using knockout is to not have to worry about those lower level details.
I've adjusted your fiddle a bit to make better use of knockout with less emphasis on using jquery.
In the view:
Used the click binding to handle your Edit click events.
Used the with binding to conditionally show the editor fields. The stopBindings handler is not needed.
In the view model:
Added the click handler editClicked to the view model.
Removed jquery event bindings.
Removed the ko.cleanNode/ko.applyBindings combo you had when binding items. You shouldn't do that and you just don't need it, knockout will handle all that for you.
Updated fiddle

Categories

Resources