Javascript: Difference between revisions
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* from JSON hash: [http://stackoverflow.com/questions/9071525/how-to-create-html-select-option-from-json-hash javascript - How to create HTML select option from JSON hash? - Stack Overflow] | * from JSON hash: [http://stackoverflow.com/questions/9071525/how-to-create-html-select-option-from-json-hash javascript - How to create HTML select option from JSON hash? - Stack Overflow] | ||
* from javascript array: [http://stackoverflow.com/questions/9895082/javascript-populate-drop-down-list-with-array JavaScript - populate drop down list with array - Stack Overflow] | * from javascript array: [http://stackoverflow.com/questions/9895082/javascript-populate-drop-down-list-with-array JavaScript - populate drop down list with array - Stack Overflow] | ||
HTML DOM selected | |||
* HTML<ref>[http://www.w3schools.com/tags/att_option_selected.asp HTML option selected Attribute]</ref> | |||
* jQuery: [http://api.jquery.com/prop/ .prop()]<ref>[http://stackoverflow.com/questions/1280369/jquery-set-selected-option-using-next select - jQuery Set Selected Option Using Next - Stack Overflow]</ref> | |||
== Display or hide the element by id == | == Display or hide the element by id == | ||
Revision as of 16:24, 17 February 2013
Javascript approaches to do the same task
Get the document by id
- document.getElementById('abcId')
- alternative: (1) Get the id attribute by using jQuery attr(): $("selector").attr("id");[1] (example) and (2) go to the first step
- parallel naming rules for html elemnt tags ex: (1)<input id='checkbox_id1' > & <select id="select_id1"> (2)Replace the input id to select id. Code snippet as follows:
var selectId = inputId.replace("checkbox_", "select_");
Changing HTML Content
- Using jQuery .html()[2] $("#selected_id").html(htmlStr);
- JavaScript HTML DOM Changing HTML Content document.getElementById(selected_id).innerHTML = htmlStr;
Create HTML select option
- from JSON hash: javascript - How to create HTML select option from JSON hash? - Stack Overflow
- from javascript array: JavaScript - populate drop down list with array - Stack Overflow
HTML DOM selected
Display or hide the element by id
- HTML DOM Style object
- document.getElementById( selector_id ).style.display = "none";
- Using jQuery .show() or .hide():
- $("#selector_id").show(); or
- $("#selector_id").hide();
- Using jQuery .css():
- $("#selector_id").css("display", ""); or $("#selector_id").css("display", "block");
- $("#selector_id").css("display", "none");
Count the number of visible table rows
- $('#selector_id:visible').length; jQuery v.1.9.1[5]
- $('#selector_id:not([style*="display: none"])').length;
jQuery v.1.9.1 + IE 
v.8 not work
count the number of all table rows (includes visible and invisible rows)
- document.getElementById( table_id ).rows.length;