Create combobox dynamically in JS

Source: Internet
Author: User

Create combobox dynamically in JS

I have not written JavaScript code in my usual learning process. Because I am not familiar with it, I am more or less afraid of JS Code. When I arrived at the company, the overwhelming JS Code was simply dumbfounded. In the world where JavaScript code is used all over the world, I have learned a little bit about it. I would like to warm up with a small feature:


Use JS Code to dynamically create a comboboxThe function is simple. ajax is used to asynchronously obtain data from the background and display the data on the foreground. How can I write the specific JS Code? How do I write the background code?




$dialog.find("select[name=materialunitid]").change(function() {if ($(this).val()) {$dialog.find("select[name=productid]").removeAttr("disabled");$.ajax({url: contextPath + "/jobcontent/" + $(this).val() + "&t=" + $.now(),async: false,dataType: "json",success: function(data) {var $select = $dialog.find("select[name=productid]").empty();$select.append(new Option("Select...", ""));if (data && data.length) {$.each(data, function(i, t) {$select.append(new Option(t.productname,;});}}});} }


Use the find () method to obtain the descendant of each element in the current Element Set, filter by selector, jQuery object, or element, and use ajax to dynamically obtain the data to be displayed from the background; use the append method to dynamically add an Option.




@RequestMapping("/")@ResponseBody@Overridepublic Object getProductsByUnitId(HttpServletRequest request) {String unitId = request.getParameter("unitid");List
    results = jobContentService.queryEntities(DataProducts.class, null, DataProducts.PROP_MATERIALUNITID+ " = '" + unitId + "'", null, null, null);if (results != null && results.size() > 0) {return JSONArray.fromObject(results).toString();}return "[]";}


Use HttpServletRequest to obtain the Id from the foreground. query the data in the database based on the Id. Convert the data into a JSON string and pass it to the foreground.



The javascript code control drop-down box cannot be Edited:


Method 1:


$('#cc').combobox({    required:true,    multiple:true,disabled:true  }); 


Method 2:


Dynamically Retrieve the selected value from the drop-down list:
var unitname = $dialog.find("select[name=materialunitid] option:selected").text();

Writing JS Code is actually not much different from writing back-end code. Clarify your ideas and follow your ideas. pay more attention to the specific methods of getting it.


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